TOP 11 best indirect heating boilers: rating of models + recommendations on how to choose a boiler

We have compiled a rating of indirect heating boilers and noted the pros and cons of each model to make your final choice easier.

Rating of indirect heating boilers

Our list of the best includes the most interesting models in terms of design and performance, which easily fit the definition of “price-quality”.

We decided to divide all models into 4 groups, the main criterion being volume.

Rating of the best boiler models

Photo	Name	Rating	Price
The best boilers up to 100 l
#1	Read also: Virtual reality glasses and helmets: TOP best models. How to choose?	Gorenje GV 100	⭐ 4.9 / 5 2 - votes	Find out the price
#2		Protherm WH B100Z	⭐ 4.8 / 5	Find out the price
#3		Baxi Premier plus 100	⭐ 4.65 / 5	Find out the price
The best boilers up to 150 l
#1		Vaillant VIH R 150	⭐ 4.85 / 5 2 - votes	Find out the price
#2		De Dietrich BP 150	⭐ 4.75 / 5	Find out the price
#3		Baxi Premier plus 150	⭐ 4.6 / 5	Find out the price
The best boilers up to 200 l
#1		Drazice OKC 200 NTRR	⭐ 4.85 / 5 2 - votes	Find out the price
#2		Baxi Premier plus 200	⭐ 4.75 / 5 2 - votes	Find out the price
#3		Protherm FE 200 VM	⭐ 4.65 / 5	Find out the price
The best boilers up to 300 l
#1		Protherm FS B300S	⭐ 4.85 / 5	Find out the price
#2		Gorenje VLG300B1-1G3	⭐ 4.7 / 5 1 - voice	Find out the price

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Rating of the best indirect heating boilers

Nomination	place	Name of product	price
The best indirect heating boilers with a volume of 100 l	1	ACV Smart 100	62 100 ₽
2	Electrolux CWH 100.1 Elitec	26 900 ₽
3	Gorenje GV 100	18 361 ₽
The best indirect heating boilers with a volume of 150 l	1	Vaillant uniSTOR VIH R 150/6 B (BR)	39 451 ₽
2	Baxi Premier Plus 150	42 040 ₽
3	Hajdu AQ IND150SC	21 700 ₽
The best indirect heating boilers with a volume of 200 l	1	Viessmann Vitocell-V 100 CVA-200	49 250 ₽
2	Ariston BC2S CD2 200	56 580 ₽
3	Hajdu AQ IND200SC	24 600 ₽
The best indirect heating boilers with a volume of 300 l	1	ACV Smart Multi-Energy 300	114 000 ₽
2	Buderus Logalux SU300	60 362 ₽
3	Hajdu STA300C	36 400 ₽

The best boilers up to 100 l

No. 3. Baxi Premier plus 100

This Italian model is a high-quality assembled boiler, the heat accumulator of which is made of stainless steel. It has a built-in thermostat, space for installing a tubular electric heater and a spare coil.

Let's look at its technical characteristics:

power – 3000 W;
volume – 100 l;
pressure (inlet) – 7 atm.;
Max. water temperature – +65 °C;
time for heating water to +45 °C is 10 minutes.

The installation diagram is quite universal. This water heater can be installed both on the wall and on the floor.

pros

thermal insulation is made of high-quality material;
not afraid of corrosion;
water heats up quickly and evenly;
light weight;
installation versatility.

Minuses

the lowest maximum water temperature.

Baxi Premier plus 100

Reviews of the indirect heating boiler Baxi Premier plus 100

No. 2. Protherm WH B100Z

Czech wall model, the container of which is made of steel and covered with enamel. This water heater comes with the following components:

steel coil;
titanium electrode;
three-way valve;
three-pin thermostat;
thermal insulation made of polyurethane material, the thickness of which is 3.5 cm.

Let's look at its technical characteristics:

power – 1920 W;
volume – 95 l;
pressure (inlet) – 6 atm.;
Max. water temperature – +80 °C;
time for heating water to +60 °C is 18 minutes.

Two things are noted about this boiler. The first is that by installing a boiler from the same company, the boiler works more efficiently. The second is that after a long time with irregular maintenance, the technical characteristics do not undergo qualitative and quantitative changes.

Installation can be done on the wall.

pros

wall mounting will save space;
the set temperature lasts a long time;
two types of protection – against corrosion and bacteria;
nice design;
high quality insulation.

Minuses

it is not possible to install a tubular electric heater;
low power;
high price.

Protherm WH B100Z

No. 1. Gorenje GV 100

This model from a well-known Slovenian company has mechanical control. Its design is quite simple:

steel tank with enamel coating;
heat exchanger made of stainless steel;
dial thermometer;
two indicators - power and heating.

In order for the boiler to work properly, two valves were added to the design - a non-return valve and a safety valve. In addition, there is overheat protection. Also available is a magnesium anode which serves the same purpose as the valves.

Vertical position is the standard installation scheme using floor mounting. You can connect a gas boiler to it. An alternative option is to connect the central heating system to it.

Let's look at its technical characteristics:

power – 3000 W;
volume – 100 l;
pressure (inlet) – 6 atm.;
Max. water temperature – +85 °C;
time for heating water to +45 °C is 15 minutes.

pros

stainless steel as the basis of the structure;
external insulation is made of high quality material;
short heating time to the optimal temperature;
build quality;
small dimensions;
affordable price.

Minuses

Replacing the anode yourself is a rather difficult procedure.

Gorenje GV 100

Which company should I buy an indirect heating boiler?

In the water heating equipment market, the best products are considered to be from leading European manufacturers. There is quite good equipment produced in Russia, practically not inferior in characteristics to foreign analogues. It is better to refrain from buying Chinese boilers.

The rating of BKN manufacturers in terms of quality is headed by Czech, German and French water heaters:

Drazice is a Czech company specializing in the production of water heating equipment. In terms of quality, BKN easily competes with more famous manufacturers such as Viessmann, De Dietrich. An additional bonus is an affordable price position. The following boiler models are in demand: Drazice OKCV (horizontal);
Drazice OKC (mounted);
Drazice OKCE.

De Dietrich is a French manufacturer of heating equipment for domestic and industrial needs. It occupies a leading position in the production of boilers, indirect heating boilers and related equipment. When choosing a BKN, you should pay attention to the following models:

De Dietrich BPB (vertical installation);

De Dietrich BLC (floor-standing).

Buderus is a German manufacturer that produces products of high build quality. The line of indirect heating boilers includes only one modification. Buderus Logalux are vertical and horizontal BKN mono and combined types for obtaining hot water throughout the year, even after the heating system is turned off.

Protherm is a European company focused on supplying heating equipment to the countries of the former Soviet Union. All supplied Protherm equipment is certified and complies with the requirements in force in the EU and the Russian Federation. Boilers are unpretentious in operation and are adapted to work with low-quality coolant. The BKN model range includes:

Protherm WH (wall-mounted);

Protherm FS (for large families, volume up to 500 l);

Protherm FE.

Vaillant - the company's head office is located in Germany. The concern actively promotes products based on the use of alternative heat sources. Vailant engineers often become pioneers of unconventional methods of heating homes and providing hot water supply. Indirect heating boilers are produced in the Vaillant uniSTOR line. The drives are designed for floor installation. Tanks hold from 115 – 200 liters.

Viessmann is another German manufacturer that produces reliable indirect heating boilers that are not sensitive to water quality. Viessmann Vitocell is equipped with anti-scale protection. BKN are produced in several standard sizes from 100 to 1000 liters.

ACV is a Belgian company with almost a century of history. The main distinguishing feature of the product is that all tanks and heat exchangers are made exclusively of stainless steel. The following models of water heaters are presented on the Russian market:

ACV SMART LINE (for household use);

ACV HRs (for commercial use);

ACV COMFORT (mounted type).

Stiebel Eltron - unlike its competitors, the company, created in Germany back in 1924, had a main goal: to produce water heaters, which was reflected in the product range. Over time, transformations were made and the company began to produce equipment for heating residential buildings. Until now, the majority of products are water heaters and storage tanks. BKN are represented by the following models:

Stiebel Eltron SB (floor-standing, with built-in electric heating element);

Stiebel Eltron SHW (industrial, for permanent installation on the floor, with the ability to connect to 380V).

Hajdu is a Belgian manufacturer. A good combination of quality and cost. There is the possibility of selecting a budget option. The BKN series offers:

Hajdu AQ IND FC (wall-mounted, capacity from 18-32 kW);

Hajdu STA (industrial model, there is a recirculation pipe, tank volume up to 1000 l.).

Gorenje is a Slovenian engineering company specializing in the production of household appliances. Recently, Gorenje has been constantly expanding its range of products. Relatively recently, the production of indirect heating boilers was launched. Gorenje GV is a combined model for domestic use that has a built-in heating element.

Baxi is a concern with headquarters in the UK. The main activity is related to the production of heating equipment for comfortable heating of buildings and meeting the needs for hot water supply. The peculiarity of Baxi products is that in almost every series there is the possibility of choosing a suitable water heater with a tank treated with enamel or made of

of stainless steel. Popular: Baxi Premier plus (stainless steel);

Baxi SLIM UB (enamel or stainless steel).

Nibe is a Swiss company whose main activity is the production of heating systems using alternative energy (geothermal and other heat pumps). The product range includes economical BKN:

Nibe Quattro (model for domestic use with a rectangular body and floor installation);

Nibe Mega (floor heaters with the ability to simultaneously connect to several water points).

Evan is a domestic manufacturer that produces high-quality heating equipment. The budget cost is achieved not due to the build quality, but due to production in the Russian Federation. The equipment fully complies with CE, as well as GOST. The Evan Class Spiro series turned out to be especially successful. The boiler has a built-in heating element and can operate after the heating boiler is turned off.

Today it is better to buy a boiler offered by Drazice. The product has good reviews and a fairly reasonable price. For premium class lovers, BKN from the English Baxi, German Buderus or Viessmann are suitable. If you need a good budget model, you can purchase domestic Evan.

Model selection example

If you don’t go far, but look at the nearest reputable hydraulic store, then with a high degree of probability you can find a simple model of an indirect heating boiler Gorenje GV 100.

About this model we can say that it is inexpensive, has a capacity of 100 liters, and the following.

The tank is enameled, but this company has great guarantees on the enamel and no complaints about premature failure.
Tubular heat exchanger, made of stainless steel.
There is a thermometer and an indicator, equipped with a check valve and a safety valve.
The design features a large magnesium anode to resist corrosion.
Overheat protection.
The tank is vertical and mounted on the floor (there are similar 100 liter options from this and other companies with wall mounting).
Connection to heating pipes - pipes? inches.
Connection to the water supply – pipes? inches.
Working pressure up to 6 atm, temperature up to 85 degrees (usual standard characteristics).

The listed qualities and characteristics will help you understand other models and choose what you need.

The best boilers up to 150 l

No. 3. Baxi Premier plus 150

Baxi Premier plus 150
This model has two installation methods - on the floor and on the wall. Let's look at its technical characteristics:

pressure (inlet) – 7 atm.;
power – 3000 W;
volume – 150 l;
Max. water temperature – +65 °C;
time for heating water to +65 °C is 15 minutes.

The design includes the ability to install a tubular electric heater, which can heat up to +45 °C in two and a half hours. There is a recirculation circuit through which water can enter the coolant in a short time.

pros

two built-in thermostats – for safety and temperature maintenance;
short water heating time;
high efficiency of the heat exchanger due to its design;
strength is at a high level;
light weight.

Minuses

incomplete compatibility of the temperature sensor with the boiler;
quite high price.

Baxi Premier plus 150

No. 2. De Dietrich BP 150

De Dietrich BP 150
This model of a cylindrical water heater has a rather interesting design. In addition, the water heater of this company is known for its high-quality assembly.

The design includes the following components:

tank – steel outside, glass ceramics inside;
dial thermometer;
side flange;
magnesium anode;
thermal insulation made of polyurethane, the thickness of which is 5 cm.

Let's look at its technical characteristics:

power – 3300 W;
volume – 150 l;
pressure (inlet) – 6 atm.;
Max. water temperature – +90 °C;
time for heating water to +50 °C is 17 minutes.

The height of this boiler is one meter and its weight is slightly less than 90 kg. Mount it vertically.

pros

high resistance to corrosion;
you can turn it on and not configure it – the device will start working immediately;
easy installation and dismantling;
high-quality assembly;
reliability at the European level;
nice design.

Minuses

heavy in weight.

De Dietrich BP 150

No. 1. Vaillant VIH R 150

Vaillant VIH R 150
This German-made model is made of stainless steel. The inside of the tank is covered with enamel. Its design includes the following elements:

spiral heat exchanger made of stainless steel;
check valve;
dial thermometer;
magnesium anode;
drain valve;
thermal insulation material.

Let's move on to consider its technical characteristics:

pressure (inlet) – 10 atm.;
power – 2600 W;
volume – 144 l;
Max. water temperature – +85 °C;
time for heating water to +65°C is 23 minutes.

You can install this water heater on the floor. You can connect in two ways: through boilers (atmoVIT and iroVIT have the greatest compatibility) or through a central water supply.

pros

height adjustment of legs;
high-quality heating element;
good build quality;
compatibility with gas-type boilers;
nice design.

Minuses

Installation is a little difficult.

Vaillant VIH R 150

The best indirect heating boilers with a volume of 200 l

Full families of 3-4 people require a lot of hot water, especially in the summer. Indirect heating boilers with a volume of 200 liters can ensure uninterrupted supply. Experts have chosen the following models.

Viessmann Vitocell-V 100 CVA-200

Rating: 4.9

Users call the Viessmann Vitocell-V 100 CVA-200 boiler a reliable heating device. Its operation is stable, the unit is easy to operate, and its service life exceeds ten years. Powerful heat exchanger (36 kW) with an area of 1 sq. m quickly heats water to 95ºС. The steel tank is protected by an enamel coating; an additional magnesium anode is installed, which is powered by an external energy source. The manufacturer has effectively isolated the tank from the outside world using environmentally friendly insulation.

The boiler deservedly becomes the winner of the rating for the optimal combination of price and quality. Users are satisfied with the reliability and uniform heating of water.

Advantages

fast water heating;
long service life;
high heating temperature;
reliable protection against corrosion;

Flaws

not detected.

Ariston BC2S CD2 200

Rating: 4.8

To speed up the process of heating water with a volume of 200 liters to a temperature of 90ºC, the Ariston BC2S CD2 200 boiler was equipped with two heat exchangers. Thanks to this design solution, it was possible to increase the heat exchanger area to 1.8 square meters. m. The heater can be connected to gas boilers and solar collectors. The manufacturer has applied comprehensive protection; the inner surface of the steel tank is covered with a layer of fine enamel. A magnesium anode helps fight corrosion. A layer of polyurethane foam allows you to reduce heat loss. The thermostat prevents water overheating; the device has a safety drain valve. If there is no water in the tank, protection is provided against turning on the heating.

Experts put the boiler in second position in the rating due to its heavy weight (111 kg).

Advantages

two heat exchangers;
high performance;
availability of protective options;
durable anti-corrosion coating;

Flaws

heavy weight.

The best boilers up to 200 l

No. 3. Protherm FE 200 VM

Protherm FE 200 VM
Another Czech model from Protherm, but with a capacity of 200 liters, was included in our rating. Its controls are mechanical; the body is made of stainless steel coated with enamel.

The design of the water heater includes the following elements:

heating temperature limiter;
dial thermometer;
thermal insulation made of polyurethane;
magnesium anode.

Let's look at its technical characteristics:

pressure (inlet) – 6 atm.;
power – 1920 W;
volume – 184 l;
Max. water temperature – +80 °C;
time for heating water to +55 °C is 30 minutes.

Installation is carried out in a vertical position on the floor, since all the water supply is located on top.

pros

twin type heat exchanger;
protection against bacteria and corrosion;
long-term maintenance of the set temperature;
high-quality thermal insulation;
nice design.

Minuses

possible incompatibility with boilers - more information needed.

Protherm FE 200 VM

No. 2. Baxi Premier plus 200

Baxi Premier plus 200
The Italian company Baxi has released a water heater in its series of Premier Plus boilers with a volume of 200 liters. There are three water heating modes known for this model:

boiler;
heating element;
recirculation circuit.

Let's look at its technical characteristics:

inlet pressure – 7 atm;
power – 3000 W;
volume – 200 l;
Max. water temperature – +65 °C;
time for heating water to +45 °C is 20 minutes.

Important! Use the thermostat reading if you want to keep your boiler running longer.

Floor mounting possible. As an alternative, you can hang it on the wall.

pros

two types of installation;
not afraid of corrosion;
the design is extremely durable;
ease of installation and dismantling;

Minuses

mediocre design.

Baxi Premier plus 200

Reviews of the indirect heating boiler Baxi Premier plus 200

No. 1. Drazice OKC 200 NTRR

Drazice OKC 200 NTRR
Czech model, but from another company – Drazice. The body is made of enameled steel. It contains the following elements:

heat exchanger (quantity – 2 pcs.);
power indicator;
overheat protection;
dial thermometer;
magnesium anode;
safety valve;
6.5 cm thick polyurethane insulation.

Let's look at its technical characteristics:

pressure (inlet) – 6 atm.;
power – 4800 W;
volume – 208 l;
Max. water temperature – +90 °C;
time for heating water to +60 °C is 28 minutes.

Due to the non-standard number of heat exchangers, the boiler can be connected to two boilers at the same time - the person who prefers it will simply use it.

Important! Since the eyeliner is at the top, it can only be installed in a vertical position.

pros

connection to two boilers at a time;
high-quality thermal insulation;
the second heat exchanger is practically free;
frost protection;
easy installation and dismantling.

Minuses

It will be difficult to install due to the location of the liner at the back.

Drazice OKC 200 NTRR

How to calculate the volume of an indirect heating boiler

In order to correctly select the BKN, it is necessary to take into account several important parameters that affect further operation and the economic component of use. When calculating, the boiler power and the actual demand for hot water are taken into account.

Regulatory documents on which the main principle of calculations is based: SNiP 2.04.01-85 “Internal water supply and sewerage of buildings” and designer’s handbook, part 2.

The selection of a boiler begins with determination of hot water consumption. A properly selected boiler must meet the following requirements:

A sufficient amount of hot water supplied simultaneously to several water points. It is generally accepted that maximum costs are achieved when the bath is filled.
Heat the hot water supply to the required temperature for comfortable showering and washing dishes.
Short waiting time between opening the tap and the arrival of hot water.

The average family uses hot water at least 12 times a day. Average consumption by the number of people in a family and calculation of the volume of an indirect heating boiler is performed using the following tables:

Number of family members	Boiler tank volume (l)
Number of family members	Kitchen sink	Hand wash	Shower	Sink and shower	Sink, shower, bath
1	10	2	30	50	100
2	15	4	55	80	120
3	20	6	80	100	150
4	30	8	110	120	200
5	35	10	120	150	250
6	35	10	120	160	310
7	50	12	150	200	340
8	55	12	160	220	340

Place of water collection	Approximate water consumption (l)	Normal temperature	Water consumption at t=60°C (l)
Kitchen sink	from 10 to 20	50°C	from 8 to 16
Bath	from 150 to 180	40°C	from 90 to 108
Shower	from 30 to 50	37°C	from 16 to 27
Sink	from 10 to 15	37°C	from 5 to 8
Hand wash	from 2 to 5	37°C	from 1 to 3

For further calculations, you can use the formula for calculating the volume of the tank:

Water heater volume = water volume x (t° – t1): (t2 – t1)

R. water - planned consumption of hot water supply;
t° is the temperature of the heated water supplied to the user;
t1 – cold water temperature in the pipeline (when calculating the flow rate of cold water admixture, the value is usually taken as 10°);
t2 – temperature of water heated by the water heater.

The specified calculation formula is used to determine the constant performance of the water heater. Let's try to perform calculations for a family of 5 people, provided that the hot water supply will be used for showering and washing dishes:

Water consumption - for a shower taken for 10 minutes, one person spends about 80 liters. water, or 400 l. per family. For washing dishes, taking into account three meals a day, about 45 liters are spent. Accordingly, the daily consumption will be 445 liters.
The temperature comfortable for washing will be on average 35°C (t°). To prevent burns, the DHW is set to heat no higher than 65° (t2). Cold water for mixing is 10°C (t1).
The calculation is carried out using the formula: 445 x (35 – 10): (65 – 10) = 200 liters. The calculations included maximum values that provide some power reserve.

Based on calculations, for a family of 5 people it will be enough to install a BKN with a maximum capacity of 200 liters, which is possible if the boiler to which the water heater is connected has a power of at least 33 kW.

When determining the volume of the future boiler, you need to take into account the power of the boiler. As practice shows, this criterion is often ignored when choosing a water heater, however, it directly affects the performance of the BKN. The selection of an indirect heating boiler based on boiler power is carried out according to the table:

Water heater capacity:	Boiler power:
80 liters	not less than 16 kW
100 liters	not less than 16 kW
120 liters	not less than 23 kW
140 liters	not less than 23 kW
200 liters	not less than 33 kW

There is a direct relationship between the boiler capacity and the boiler power. Of course, you can connect a larger volume BKN to the boiler, but it will not produce the required volume of water. By installing a water heater with excessive capacity, the consumer will be faced with an increase in the heating time, which will lead to excessive energy consumption and increased costs.

The choice of BKN volume begins with a thermal engineering calculation based on boiler performance. Typically, the given values are sufficient for the average user to select a boiler for domestic hot water. Construction companies additionally take into account several more technical parameters and perform:

Calculation of heat exchanger area.

The thermal conductivity and heat capacity of water are taken into account when calculating the boiler - this value is necessary to determine the peak and constant load on the water heater. Basic values are calculated according to the table:

t, °С	0,1	10	15	20	25	30	35	40	45	50
Cp, J/(kg deg)	4217	4191	4187	4183	4179	4174	4174	4174	4177	4181
t, °С	55	60	65	70	75	80	85	90	95	100
Cp, J/(kg deg)	4182	4182	4185	4187	4191	4195	4202	4208	4214	4220
Specific heat capacity of water at a temperature of 0.1…100°C

Calculation of the length of the coil - the speed of heating water in flow mode depends on this parameter.

In the case of a combined water heater model (with a built-in heating element), electricity consumption is additionally taken into account. To transfer heat to 1 kg of water (calculations use mass rather than displacement) and raise its temperature by 1°C, 4.187 kJ of energy or 0.001 kW is required.

Having carried out simple calculations, we understand that to heat 1 liter of water from 10 to 60°C, 0.05 kW/h will be required. Further calculation of electricity for the combined BKN is carried out depending on what actual DHW consumption exists. For a large family, as a rule, a 10 kW boiler with a volume of 200 liters is sufficient.

Independent calculation of the capacity of the BKN requires an understanding of physical laws and the basics of mathematical calculations. To make your task easier, it is better to use special online calculators located on the website or seek help from the team that will connect the water heater.

The best boilers up to 300 l

No. 2. Gorenje VLG300B1-1G3

Gorenje VLG300B1-1G3
Another model from Gorenje made it into our rating. With a volume of 285 liters and a nicely designed enamelled steel body, the KGV 300-1 is a fairly powerful water heater. It includes the following elements:

dial thermometer;
safety valve;
overheat protection;
magnesium anode.

Let's look at its technical characteristics:

pressure (inlet) – 6 atm.;
power – 5540 W;
volume – 275.5 l;
Max. water temperature – +85 °C;
time for heating water to +50 °C is 22 minutes.

The large weight of the structure (140 kg) forces the boiler to be installed only vertically. What’s more interesting is that there is support for solar collectors to the water heater itself, which is an additional advantage.

pros

support for solar collectors, allowing them as an alternative heating source;
thick layer of insulation (5.7 cm);
environmental friendliness of the thermal insulation layer;
efficiency due to the solar collector;
nice design.

Minuses

The summer season is the time for problems in the operation of the boiler. The main thing is to make sure it works correctly.

Gorenje VLG300B1-1G3

No. 1. Protherm FS B300S

Protherm FS B300S
Czech boiler in the shape of a cylinder with a steel tank and an enamel coating inside. Has mechanical switches. A double heating element heats the water. Equipped with the following components:

double heating element;
titanium anode;
temperature limiter;
protection against bacteria;
recirculation circuit;
drain fitting;
thermal insulation made of polyurethane.

Let's look at its technical characteristics:

inlet pressure – 10 atm;
power – 4600 W;
volume – 295 l;
Max. water temperature – +85 °C;
Warm-up time to +45 °C – 16 minutes.

Can only be installed on the floor.

pros

double heating element quickly and easily heats water;
easy connection of the water heater;
long-term maintenance of water at a certain temperature;
high-quality thermal insulation;
The presence of a recirculation circuit will allow you to quickly heat the water.

Minuses

There are no significant shortcomings.

Protherm FS B300S

How to choose an indirect heating boiler

The power
of the heater is selected taking into account the volume of the tank and the desired speed of heating the water. When studying documents for a boiler, it is necessary to take into account the useful power of the device.
The capacity of
the water heating tank depends on the number of users. To take a shower at the dacha for a couple of avid gardeners and gardeners, a 100-liter storage tank is enough. If the family is large and has small children, then you should give preference to larger boilers (200-300 l). But at the same time, the power of the heat exchanger must be greater so that heating of the water does not take a long time.
The heating rate
also depends on the area of the heat exchanger. To find the optimal combination, you can start from the following ratio. Heating speed of water with a volume of 120 liters with a coil area of 1 sq. m will be about 30 minutes.
The reliability and durability
of the boiler is largely determined by the quality of the tank. A stainless steel tank will last the longest, but the price of such models is high. Manufacturers coat tanks made of ordinary steel with enamel or glass ceramics. Additionally, magnesium anodes help resist corrosion; they also protect the internal cavity from scale formation.
maintain the
water temperature within a given range. Budget boilers have a foam layer, while more modern products are equipped with polyurethane foam insulation.
Functionality
. Various options help to minimize human intervention in the operation of the boiler. These are overheat protection, safety valve, thermostats and thermometers.
Number of water intake points.
Using a boiler, you can supply hot water to several rooms. To do this, you need to choose a water heater with several water supply points.

Our rating includes the 12 best indirect heating boilers. Some models managed to get in due to user reviews, others received high marks from experts.

About the selection criteria

Before choosing the best option for this type of boiler, you need to understand what to look for.

We decided to briefly talk about the most significant criteria of all. Their knowledge and understanding will help you choose the most suitable option for you.

Storage tank volume

Its quantity is determined by daily needs and the boiler to which the water heater will be connected. If it is calculated incorrectly, there will be a problem with the appearance of hot water in several places at once. To prevent this from happening, you need to calculate the required volume in your boiler. As a rule, one person uses, on average, up to eighty liters of water per month. So much is spent not only on hygiene, but also on washing dishes.

Conclusion: you need to take a boiler with a reserve volume so that there is enough for everyone.

Volume is an important criterion when selecting a high-quality water heater

Storage tank material

Today tanks are made from three materials:

steel with enamel;
"stainless steel";
titanium coating.

Titanium is rarely used, but its strength is much higher, as is its price.

Conclusion: the tank must be made of a material that is resistant to corrosion. In addition, you need to pay attention to the presence of a magnesium anode.

Heat exchanger structure

There are two options for its structure.

"Matryoshka" With this structure, one tank is located in another. The one inside is filled with water. The one on the outside is where the coolant circulates.
Heat exchanger with coil. Typically one coil is used, although more than one can be used.

Important! If there are two coils, the boiler can be connected to a second heat source.

How does an indirect heating boiler work?

heating element

If you have a tubular electric heater, the boiler can be used all year round. If it is impossible to connect an alternative heating element, the water heater will heat from the mains.

Inlet pressure

This indicator is one of the determining criteria when installing it in an apartment, since central heating often fluctuates.

Conclusion: you need to take durable boiler models.

It is important to consider what water pressure will be at the inlet

Find out more about the correct connection of an indirect heating boiler with your own hands - in the article you will find detailed step-by-step instructions.

Some important criteria for choosing indirect heating boilers

Volume of the tank

This parameter is selected in a similar way to electrical “storage” devices, depending on the number of active users and goals. Only in this case, the power of the connected boiler and the temperature of the coolant in the heating system will also be important.

Heat exchanger design

Can be applied:

Tubular coil. One – in a standard format, two – in models with the ability to connect to an alternative source of thermal energy;
Boilers with a “tank in tank” system. They consist of two containers (usually made of stainless steel) of different sizes, inserted into one another. The inner one is filled with so-called sanitary water, the second contains a coolant that provides heating.

Tank material

There are 3 options:

stainless steel;
enameled steel;
titanium coating.

The first two varieties are most common. In any case, the anti-corrosion properties of the material are important, and for greater reliability you should pay attention to the presence of a magnesium anode (especially if you choose a less expensive boiler with an enameled tank).

Maintained operating pressure

This parameter can be seen in the specification. Depending on the model, the range varies from 6 to 11 bar (usually 6-7).

A very important indicator for those who install a boiler in an apartment. Domestic water supply systems are characterized by pressure surges, sometimes exceeding the standard twice as much, and safety valves can become clogged. And in order not to curse the innocent manufacturer, there is a reason to install a reducer at the inlet and calmly enjoy the flawless operation of the boiler without any leaks.

Availability of heating elements

No matter how good and economical an indirect water heater is, sometimes there may simply be no heating. Then combined models with the addition of electric (gas) heating elements are relevant. Simply put, a model with a heat exchanger and heating element, if the coolant supply from the outside is unavailable, is capable of operating as a regular storage electric water heater.

About manufacturers

Boilers are a fairly narrow-profile product, known in detail only to professionals in their field. We offer you a table with a brief description of well-known companies whose products deserve attention due to their high quality.

Table No. 1. Manufacturers

Manufacturer	Description
Gorenje	A world-famous company from Slovenia. Founded in 1950. Specialization – household appliances. Almost all of its products are export-oriented.
Protherm	A company whose main office is in the Czech Republic. Founded in 1992. Since the same year, it has been producing water heating and heating equipment.
De Dietrich	French group of companies. Founded in 1864. Mainly produces equipment for heating systems and more.
Vaillant	It is Germany's leading manufacturer of heating equipment. Formed in 1874. The company is known for the fact that today people assemble robots and instruments.
Drazice	A company from the Czech Republic, which is known for its reliable water heaters. Founded in 1956. Its products meet all the standards and requirements of EU countries.
Baxi	An Italian company that has been making high-quality heating and water heating equipment for more than half a century. The company was formed in 1866.

The best manufacturers offer only high-quality devices

Rating of the best models

Hajdu ID 20A

A good model that is perfect for one owner. Because the tank volume is 80 liters. The maximum heating temperature is 95 degrees Celsius. There is a reliable protection system consisting of a magnesium anode. There is a recirculation line entrance, which will reduce the risk of harmful bacteria. The inner coating of the tank is enamel, so a person needs to be prepared for possible malfunctions in the future. The heat exchanger area is 0.62 sq.m, with a maximum power of 18.5 kW. Installation method: vertical with wall mounting. The service life declared by the manufacturer is 10 years, the warranty is 2 years.

The average cost is 11,550 rubles.

Hajdu ID 20A

Advantages:

High rating;
Good heating;
Easy installation;
Price;
Build quality.

Flaws:

Enamel coating.

Drazice OKC 125 NTR

A high-quality boiler with floor placement, which is intended for a family of two people. The capacity of the tank for storing and supplying water is 112 liters. The maximum heating temperature is 90 degrees. There is a convenient indication that notifies you of the current status of the device. There is high-quality protection against overheating with a safety valve, which allows you not to worry about the current condition of the unit. A magnesium anode is also present. Fourth degree of protection against water. The inner coating of the tank is enamel. The maximum power of the device is 32 kW. Dimensions - 524x1067x524 mm, placement method - floor, vertical. Weight – 66 kg. The boiler comes with a two-year warranty.

The average price is 18,240 rubles.

Drazice OKC 125 NTR

Advantages:

Good heating;
Doesn't take up much space;
Acceptable price;
Volume;
Power;
Protection.

Flaws:

Coating.

Protherm FE 200/6 BM

An expensive boiler, which is intended for a large family. The maximum heating temperature is 80 degrees. Tank capacity – 184 liters. The pressure obtained at the outlet varies from 1 to 6 atmospheres. The control of the device is completely mechanical, there is a thermometer and a temperature limiter, which increases the service life. There is also standard coil protection. The only drawback is the enamel coating. The heater is placed on the floor, vertically. Weight – 97 kg. 2 year warranty.

The average cost is 32,000 rubles.

Protherm FE 200/6 BM

Advantages:

Easy setup;
Efficiency;
Good capacity;
High-speed heating;
Thermostat.

Flaws:

Coating.

Kospel Termo Hit WW

An unusual device with a maximum capacity of 80 liters will be an excellent replacement for an outdated water heater. The maximum heating temperature is 80 degrees, with the possibility of additionally installing a heating element. There is complete protection against scale. The maximum heat exchanger power is 9.50 kW. Placement method: horizontal. Weight – 26.5 kg. The manufacturer provides a 1-year warranty on the operation of the device.

Sold at a price: from 10,000 rubles.

Kospel Termo Hit WW

Advantages:

Little weight;
High-speed heating;
External execution;
Price;
Assembly.

Flaws:

Not found.

Drazice OKC 200 NTR/BP

A good model with a maximum capacity of 208 liters will be an excellent helper in the family when the hot water supply is turned off. The water temperature reaches 90 degrees. There is magnesium protection, which will protect the tubes from scale formation. The coating inside the boiler is enamel, which must be handled carefully and not create conditions for sudden temperature changes. Heat exchanger area – 1.45 sq. m, while the maximum power of the water heater is 32 kW. The device is placed vertically, with floor mounting. Weight – 92 kg. The warranty period is two years.

The average cost is 27,300 rubles.

Drazice OKC 200 NTR/BP

Advantages:

Fast heating;
Suitable for 3-4 people;
Convenient installation;
Price;
Good defense.

Flaws:

Not found.

Nibe-Biawar Mega W-E300.81

An excellent model with a maximum capacity of 300 liters and a maximum heating of 95 degrees, it will help in any situation. The device is controlled mechanically. There is an effective thermostat and temperature limiter. For protection, the manufacturer has equipped the device with an excellent anode that will prevent scale formation. The internal coating is enamel, but if treated well, the boiler will last for over ten years. Weight – 150 kg.

The average price is 60,000 rubles.

Nibe-Biawar Mega W-E300.81

Advantages:

Easy to install;
High-quality and fast heating;
Maintaining the set temperature;
Efficiency;
Easy operation;
Assembly.

Flaws:

Not detected.

Roda Kessel ILW 200 B

A good water heater with an impressive volume of 200 liters and an outlet pressure of up to 7 atmospheres. There is a convenient indication that allows you to monitor the current status of the device. There is a full-fledged temperature limiter, which significantly increases the efficiency of the device. For greater safety, the manufacturer has equipped the boiler with overheating protection. The coating is enamel. The maximum power is 32 kW.

The average cost is 28,000 rubles.

Roda Kessel ILW 200 B

Advantages:

Good characteristics;
Price;
Volume;
Build quality;
Easy installation;
Laconic appearance.

Flaws:

Not found.

Hajdu STA300C

A high-quality device with a glass-ceramic coating that will serve the owner for a long time. The maximum capacity of the tank is 300 liters, this value is enough to provide hot water to a family of 5 people. The maximum heating temperature is 95 degrees. The pressure that forms at the inlet is 7 atmospheres. There is one active magnesium anode, which keeps the internal element clean. The maximum heat exchanger power is 45 kW. It is possible to install additional heating elements. Placement method: vertical. Warranty – 5 years.

The average cost is 39,970 rubles.

Hajdu STA300C

Advantages:

High-speed heating;
Service life 10 years;
Efficiency;
Volume 300 liters;
Easy installation;
Price.

Flaws:

Not found.

Which indirect heating boiler is worth purchasing?

As mentioned earlier, choosing a boiler requires taking into account a large number of criteria. Among them, several important ones stand out.

Number of people.
Water consumption rate.
Number of water points.
Storage tank volume.
Power.
Inlet pressure.
Water heating speed.

Taking into account all the above criteria, we decided to help you choose water heater models that are suitable in most cases.

If you have a small living space and you live alone or with someone, then a boiler model like the Gorenje GV 100 will be more than enough.
If you have a larger living space and your family consists of 2-3 members, then you should take the Baxi Premier plus 150.
A two-story house in which four people live? Then you need to pay attention to the Drazice OKC 200 NTRR model.
If your life is at the “luxury” level, then there is only one option for you - Protherm FS B300S.

Models of indirect water heaters

The advantages of boilers of this type in terms of their efficiency mean that popular manufacturers provide a wide selection of models. The table shows several options for the main volumes used in different price ranges.

Model name	Tank volume, liter	Heat exchanger type	Installation	Availability of additional heaters
Gorenje GBK80ORLNB6	80	Coil	Wall-mounted	2 “wet” heating elements
Baxi Premier Plus 150	150	Double coil	Wall-mounted	No
ACV COMFORT 210	203	Double tank	Floor	No
Hajdu STA 400 C	400	Coil	Floor	Installed as desired
ACV HRs 1000	1000	Double tank	Floor	No

The main selection criterion is the capacity of the hot water tank. For the needs of one person, a volume of 60-80 liters is sufficient. For a family of 2-3 people, 100-150 liters are enough. For more consumers a minimum of 200 liters is required. Boilers with a capacity of 400 liters or more are intended for industrial consumption.

Poll: Which boiler is better?

Which indirect heating boiler will you choose?

Gorenje GV 100

22.22 % ( 2 )

Protherm WH B100Z

0.00 % ( 0 )

Baxi Premier plus 100

0.00 % ( 0 )

Vaillant VIH R 150

22.22 % ( 2 )

De Dietrich BP 150

0.00 % ( 0 )

Baxi Premier plus 150

0.00 % ( 0 )

Drazice OKC 200 NTRR

22.22 % ( 2 )

Baxi Premier plus 200

22.22 % ( 2 )

Protherm FE 200 VM

0.00 % ( 0 )

Protherm FS B300S

0.00 % ( 0 )

Why do you need an indirect heating boiler?

Unlike other types of water heaters, it allows you to obtain water at a given temperature at all water points, even when they are used simultaneously. You won't have to coordinate your shower time with other family members, fearing sudden temperature changes due to the unexpected turning on of the kitchen faucet. Many models have the ability to connect a recirculation circuit, which allows you to receive hot water immediately without first draining. In large private houses with several bathrooms, as well as in the presence of a jacuzzi, such a boiler is simply irreplaceable.

An important advantage of an indirect heating boiler is the absence of costs for an energy source. During the heating season, heating is carried out using the coolant of the heating system, but in the summer it is possible to install an additional heating element. Some manufacturers, for example Meibes, have models in their line of water heaters that can operate in systems with renewable energy sources. In terms of initial costs, an indirect heating boiler with a single-circuit boiler will definitely be more expensive than a double-circuit boiler, but this difference will more than pay off in comfort and savings during operation.

Peak consumption

Indirect heating boiler, diagram
Based on the above, it seems that even the smallest heater will be enough. Alas, not everything in life is so smooth. When calculating the volume of the tank and the required power of the unit, it is necessary to take into account that in the morning the whole family wakes up and gets ready for work or school at approximately the same time. There is simply no time to wait until the water in the boiler is completely heated. There should be enough stock of accumulated liquid and heating of the flowing liquid during the time it is consumed by consumers.

According to statistics, utility services morning hot water consumption is about 30%-40% of the average daily value for 1.5 hours. The period taken is from 7:00 a.m. to 8:30 a.m. Let's take the average figure of 35% and find that our family will use 5000 / 7 * 35% = 250 liters in 1.5 hours, which is equal to 170 liters per hour of warm water. For this amount we will need 170 * 75% = about 130 liters of hot water and 170 * 0.0375 = 6.5 kW of water heater power.
But that's not all. As fully heated water from the tank is consumed, cold water will be added to it, which needs to be heated, and this takes time.
The average heating rate in flow mode depends on the temperature of the coolant and the surface area of the circuit. Since the heating liquid comes from the boiler, its temperature will always be about 70 - 75o, and the heat exchanger is calculated relative to the volume of the tank and the declared power of the device.
The average figures are approximately equal for devices from all manufacturers and are about 0.3 l/min for a boiler with a heat exchange circuit load of 10 kW at a temperature difference of 50° that we set. In one hour, the volume of heated running water will be 60 * 0.3 = 18 liters.

Thus, calculating the volume of an indirect heating boiler shows that for one morning of a working day, a family of 4 people will need a device with a power of at least 10 kW and equipped with a tank with a capacity of more than 100 liters. With an increase in the capabilities of the heat exchange circuit, the heating rate will increase in proportion to the increase in power, but the amount of heat taken from the boiler will also increase.

The best manufacturers and prices of indirect heating boilers

According to retail sales reports, several of the best manufacturers of indirect heating boilers can be identified:

Gorenje;
Bosh;
Drazice;
Buderus;
Vaillant.

Prices, of course, greatly depend on the configuration. For example, a 95-liter Drazice heater without a heating element and the possibility of installing it costs almost 25 thousand rubles. The same displacement, but with a heating element - 27 thousand rubles. By the way, the manufacturer (Czech Republic) provides a 60-month warranty. Prices for Bosh start from 32 thousand rubles, and for Buderus from 45 thousand. As you can see, the price range is significant.

Which indirect heating boiler is better to buy?

When choosing any type of boiler, including indirect, it is important to consider the volume of the storage tank. There should be at least 30 liters per person, but 50 liters is better.

In this case, the container must be commensurate with the volume of the heat exchanger so that the water warms up faster.

The internal coating of the tank can be made of steel and stainless steel, which are characterized by durability. Enamel or glass-ceramic coating will provide better protection against moisture.

The functionality of boilers is affected by the presence of various options, for example:

Recirculation function - provides a quick supply of hot water by constantly maintaining the temperature of the liquid in the pipes.
Additional electric heating element – provides additional heating or maintenance of water temperature, and is also used for heating in emergency situations of the boiler or in the summer.
The presence of a safety valve and anode (magnesium, titanium) - extends the life of the boiler
Temperature sensor and thermostat - allow you to set the degree of water heating.

Important characteristics of indirect boilers are the maximum water heating temperature, dimensions and type of installation (wall-mounted, floor-mounted, horizontal, vertical), as well as the type of pipe connection (side, bottom, top), and the type of water connection connector in inches. The choice depends on the specific operating conditions.

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The best indirect heating boilers up to 100 l

For 1-2 people and a small number of water intake points, boilers with a tank volume of up to 100 liters are optimal. They will provide the family with the necessary amount of warm water without wasting extra energy and time on heating the excess liquid.

Protherm WH B60Z

★★★★★

editorial assessment

100%

buyers recommend this product

The WH B60Z model from Protherm is not only an efficient, but also a stylish boiler designed for domestic use.

It has a unique coil design with two tubes of different diameters, which ensures high equipment efficiency.

The boiler heats water up to 85 degrees maximum and is able to maintain the set temperature at the same level. There is a recirculation option.

The installation of the water heater can be either wall-mounted or floor-mounted with a right or left water connection. The model is equipped with a high-quality titanium anode and has an antibacterial coating on the tank, designed for 53 liters.

Advantages:

Stylish design;
High efficiency;
Unique twin heat exchanger;
High heating temperature;
Universal installation;
Antibacterial coating.

Flaws:

Expensive.

Reliable polyurethane thermal insulation, heating speed, protective systems and minimal energy consumption - all this makes the WH B60Z boiler from Protherm one of the leaders in the modern water heater market.

TML BMX 100

★★★★★

editorial assessment

100%

buyers recommend this product

The TML indirect boiler is designed for the production and storage of hot water for sanitary purposes. It is suitable for both horizontal and vertical installation and holds 100 liters of liquid.

The tank and heat exchanger of the equipment are made of stainless steel, processed by passaging and etching, resistant to mechanical damage.

And the thermal insulation layer is made of hard polyurethane 25 mm thick, which ensures excellent temperature retention.

The standard equipment of the boiler includes a magnesium anode. As an option, you can use a non-consumable electronic element, as well as an electric heating element, thermostat, thermometer and recirculation line. The boiler is capable of heating water up to +95° C.

Advantages:

Universal installation;
Possibility of additional equipment;
High heating temperature;
High-quality thermal insulation;
Stainless steel tank.

Flaws:

High price.

The indirect heating boiler BMX 100 from TML is universal in use, suitable for installation in large and small rooms and can work with gas and solid fuel boilers.

Drazice OKC 100 NTR/Z

4.9

★★★★★

editorial assessment

93%

buyers recommend this product

The compact water heater NTR from Drazice is designed for floor installation, modification Z is for wall installation.

The boiler is used for indirect heating of non-edible water to +90° C. It is equipped with a working thermostat and has a thermometer that displays the actual water temperature.

The boiler is equipped with a 95 liter tank with an internal coating made of corrosion-resistant enamel. Overheat protection and a safety valve extend the operating life of the equipment.

And the service hatch makes it easy to monitor the internal cleanliness of the tank. Additional installation of heating elements is possible.

Advantages:

Options for wall and floor installation;
Thermostat;
Possibility of installing a heating element;
Service hatch;
Very high heating temperature.

Flaws:

Not suitable for heating drinking water.

Indirect heating boiler OKC 100 from Drazice is reliable and durable equipment for a small family or small office.

Hajdu AQ IND 75 FC

4.8

★★★★★

editorial assessment

89%

buyers recommend this product

The compact boiler from Hajdu is designed for fast and economical heating of water. It has a vertical wall installation with a bottom water supply, allowing it to be placed in a small space above other equipment or plumbing.

The device is equipped with a copper heater, which ensures rapid heating of water to a maximum of 65 degrees. If desired, an electric heating element can be installed on the boiler.

The 75 liter tank is covered with glass-ceramic enamel. Together with the magnesium anode, this provides excellent corrosion protection.

The water heated by the boiler is suitable not only for sanitary needs, but also for food. The water heater is equipped with a thermostat and thermostat.

Advantages:

Compact dimensions;
Fast water heating;
Excellent corrosion protection;
Suitability for food purposes;
Thermostat and thermostat;
Recycle.

Flaws:

Not the highest heating temperature.

The AQ IND 75 FC water heater from Hajdu is optimal for a family of 1-3 people. At the same time, it is quite economical because it does not overheat the water.

Rating of the TOP 10 best indirect heating water heaters

Place	Model	Price
The best models up to 100 liters
#1	Hajdu ID 25A
#2	Kospel SWR-100
#3	Drazice OKC 100 NTR
The best models from 100 to 200 liters
#1	Drazice OKC 125 NTR
#2	Hajdu ID 40A
#3	BAXI Premier Plus 150
#4	BAXI Premier Plus 200
#5	Drazice OKC 200 NTR
#6	Hajdu ID 50A
#7	Kospel Termo Hit WW 120

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Installation method

Indirect heating boilers can be floor-mounted or wall-mounted. The compact wall-mounted boiler is convenient for small spaces. It can be placed directly above the floor boiler. But for obvious reasons, the tank of a wall-mounted water heater cannot be large in volume.

If you decide to buy an indirect heating boiler with a large storage tank, you will have to allocate additional space for floor mounting of such equipment. A floor-standing boiler is placed to the right or left of the boiler. The boiler legs are height adjustable for proper installation and stability of the structure during operation.

Which indirect heating boiler to choose for a private home

Independently choosing an indirect heating boiler is a complex process and requires certain technical skills and knowledge. Conventionally, the selection of a water heater can be divided into several important stages:

calculation of volume, power;

determination of the type of structure and material of the housing;

choice by cost and manufacturer.

The first stage of selection, namely, calculating the heating of an indirect heating boiler, is best left to professionals. Without technical education, you can figure out all the nuances yourself if you wish.

Boiler - the choice of the most practical

Let's summarize. Why is such a unit really a useful purchase?

We all know that utility services love to “delight” with annual scheduled and other shutdowns of hot water. In this case, everyone is saved as best they can. Some heat basins and pots, while others make do with cold water alone. Both are fraught with dangerous consequences. No matter how hot it is, a cold shower will not bring much pleasure and saving coolness, but can lead to serious illnesses, even pneumonia. Boiling water, which is transferred in a variety of containers to a bathtub or sink, can cause a serious thermal burn with one awkward movement. Why expose yourself and your loved ones to such a risk? After all, you can transfer with maximum comfort all the days and weeks during which pipe replacement work is carried out.

An indirect heating boiler will allow you to use hot water whenever you want, and in any quantities. With such a device, you will no longer worry about how to easily clean the house, wash the dishes or prepare dinner for your family.

Amount of power consumption

Boiler, connection
Having decided on the need to purchase and calculating the volume of an indirect heating boiler, you need to calculate how much warm water is needed for normal existence. Let's imagine a family of 4 people and carry out an average daily analysis for a week and a peak (workday morning) study of hot water consumption.

Weekly analysis

To wash dishes you will need about 5 liters of warm water per minute. The rinsing time is taken into account, it is about 5 minutes. We wash the plates twice a day, and we get 50 liters of warm water per day for kitchen utensils. Let's multiply by 7 days a total of 350 liters per week.
Each person takes a bath 2-3 times a week, spending about 170 liters. 4*2.5=10*170=1700 liters in 7 days.
Another 4-5 showers for 10 minutes at a flow rate of about 12 l/min. 4.5*10*12=540 per family member, respectively, for all 2160 liters per week.
Minor hygiene (wash hands, shoes, clean the house) - about 10 liters per day per person will amount to 280 liters for the study period.

Total - 350+1700+2160+280=4490 liters per week. Let's add in the guests who came in and the reserve just in case, we get an approximate figure of about 5000 liters per week. But the boiler counts in hours, you need to convert it to its units. 5000 / 7 / 24 = 30 liters per hour of warm water is the average consumption of a family of 4 people.

Based on our figures for the relationship between temperature and power, we obtain the required average power consumption - 30*0.0375 = 1.125 kW/hour.

Design and principle of operation

In appearance and design, an indirect heating boiler is similar to a conventional electric storage water heater. This is a metal tank of a certain volume of a cylindrical or rectangular shape, covered with a metal or plastic outer casing.

A tubular spiral heat exchanger is located inside the tank. The coolant circulates through this “coil” and heats the water in the tank. Some boilers have two coils installed, which allows them to be connected to two sources of thermal energy at once. Almost all models are equipped with a magnesium anode - a special element that protects surfaces and parts in contact with water from corrosion and scale. To reduce heat loss and increase efficiency, there is a layer of thermal insulation material between the tank and the outer casing.

The design of boilers also provides for the presence of protection and safety systems: safety valves, expansion tanks, pressure and temperature sensors. A useful option is the ability to connect a recirculation line to obtain hot water immediately after turning on the tap.

The best manufacturers of indirect heating boilers - which company to choose

There are many indirect heating boilers on the market - they differ not only in technical characteristics, appearance and price, but also in workmanship. Without prior preparation, choosing the right device can only be done at random. Since the drive is not cheap, it would be wrong to take risks and make a purchase on a whim.

Below are companies that have earned the trust of customers with their high-quality equipment:

1. Gorenje

2. Drazice

3.Protherm

4. Baxi

5. Vaillant

The proposed material talks about many nuances of choice. Knowing them, buying the right model will not be difficult. But if the reader doesn’t have any time at all, and wants to buy a storage device that is inexpensive, at the same time high-quality and compatible with the heating boiler, we recommend that you get straight to the point and choose a specific model in the rating of the best indirect heating boilers.

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