Combined heating boilers: a general overview of the units + how to choose the best model?

Ranking table

Place in the ranking / Name	Expert evaluation	Price range rub.
Inexpensive wall-mounted boilers
1: Lemax Patriotc	99 out of 100	From 18,400 to 18,424
2: Oasis BM-18	97 out of 100	From 25,190 to 26,300
3: Mizudo M24T	86 out of 100	From 32,200 to 33,555
4: BaltGaz SL 17T	86 out of 100	From 18,500 to 19,500
The best hinged convection type boilers
1: Buderus Logamax UO72-12K	96 out of 100	From 32,445 to 32,750
2: Bosch Gas 6000W	94 out of 100	From 32,450 to 48,000
3: BAXI ECO-4s 24F	92 out of 100	From 31,570 to 33,120
Wall mounted condensing boilers
1: Protherm lynx 25/30 MKV	99 out of 100	From 63,400 to 64,123
2: Vaillant ecoTec plus VU INT IV 346/5-5	98 out of 100	From 112 830 to 115 889
3: BAXI LUNA Duo-tec 40	94 out of 100	From 79 620 to 81 850
TOP 3 floor single-circuit boilers
1: Lemax Clever 20	99 out of 100	From 29 134 to 38 150
2: Siberia 17 17.4	90 out of 100	From 22,356 to 24,987
3: BAXI SLIM 1.230 IN	98 out of 100	From 56,250 to 56,710
Floor standing condensing boilers
1: Ferroli Quadrifoglio B 70	99 out of 100	From 278 313
2: BAXI POWER HT 1.650	98 out of 100	From 179 000
3: Fondital Giava KRB 24	96 out of 100	From 367 618 to 417 754
Inexpensive floor double-circuit boilers
1: ATON Atmo 10EBM	99 out of 100	From 20,500 to 21,690
2: Lemax Premium-30V	97 out of 100	From 31,300 to 33,120
3: Navien GA 35KN	78 out of 100	From 36,025 to 36,990
Floor boilers with built-in boiler
1: Protherm Bear 30KLZ	994 out of 100	From 140,529 to 144,680
2: Ferroli Pegasus D40	98 out of 100	From 192 890 to 194 400
3: ACV HeatMaster 45TC	96 out of 100	From 527,700 to 531,140

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What power should the boiler be?

The technical documentation for the gas heater necessarily contains information about the rated power. Before buying equipment, it is advisable to calculate the need for heat in the room. Often, the manufacturer there also indicates the quadrature of the room that this equipment will be able to heat.

But all this is rather arbitrary, without competent heat engineering calculations for a particular house, you should not choose a gas boiler.

The calculation of the required power is made taking into account the quadrature of the building, the configuration and type of the heating system, the climate zone and many other factors

Recommendations of 1 kW for every 10 m2 of a cottage are very average figures. They rarely reflect reality.

An experienced heating engineer in the calculations should take into account:

• area and cubic capacity of each room;
• climatic conditions of the region of residence;
• quality of insulation of external walls;
• the size and number of windows, as well as the type of double-glazed windows in them;
• the presence of balconies and street doors;
• characteristics of the heating system, etc.

In addition, the quality of the fuel and the gas pressure in the line are taken into account. A separate calculation is made for the DHW system. And only then both figures are summed up and increased by 15-20% in reserve, so that the boiler can cope with both constant and peak loads without problems.

The best solid fuel boilers for long burning

Stropuva Mini S8 8 kW

Bright solid fuel boiler with a safety valve, 8 kW. Suitable for space heating 80 m2. Fuel burns up to twenty hours, the temperature is enough for the whole night.

Characteristics:

• device type - solid fuel boiler;
• type of burning - long;
• contours - single-circuit;
• power - 8 kW;
• area - 80 m2;
• placement - outdoor;
• energy independence - yes;
• management - mechanics;
• combustion chamber - open;
• fuel - firewood, wood briquettes;
• safety valve - yes;
• thermometer - yes;
• weight - 145 kg;
• price - 53,000 rubles.

Advantages:

• compactness;
• long burning;
• ease of use;
• reliable handles;
• does not require power supply;
• durable construction.

Flaws:

• high price;
• heavy weight;
• it is difficult to wash the lining from soot;
• not very convenient loading of firewood.

ZOTA Topol-22VK 22 kW

A high-quality solid fuel device with a power of 22 kW, which is enough to heat an area of ​​​​220 m2. Comfortable loading consists of two sections for laying firewood.

Characteristics:

• device - solid fuel boiler;
• contours - single-circuit;
• power - 22 kW;
• placement - outdoor;
• control - without control panel;
• fuel - coal, coal briquettes, firewood, wood briquettes;
• thermometer - yes;
• weight - 128 kg;
• price - 36860 rubles.

Advantages:

• various types of fuel;
• long burning;
• economical consumption;
• convenient operation;
• reliable construction.

Flaws:

• heavy weight;
• no control panel.

ZOTA Topol-16VK 16 kW

A worthy model of a solid fuel boiler with two sections for loading fuel. Designed for heating small private house or workshop of 160 m2.

Provides long burning of firewood or coal.

Options:

• unit - heating boiler;
• fuel - coal, firewood, coal and wood briquettes;
• power - 16 kW;
• placement - outdoor;
• control - without control panel;
• Efficiency - 75%;
• thermometer - yes;
• weight - 108 kg;
• cost - 30100 rubles.

Advantages:

• heats up quickly;
• gives uniform heat;
• quality materials;
• long burning;
• the possibility of laying briquettes;
• easy control.

Flaws:

• high price;
• big weight;
• no control panel.

ZOTA Topol-32VK 32 kW

Reliable unit for solid fuel, power up to 32 kW. Capable of heating an area of ​​320 square meters. maybe install an additional heating element and connect an external control.

Great for a country house, provides long-term fuel burning.

Characteristics:

• device type - solid fuel boiler;
• the number of circuits is one;
• power - 32 kW;
• area - 320 m2;
• installation - floor;
• energy independence - yes;
• management - mechanics;
• Efficiency - 75%;
• fuel - coal, coal briquettes, wood briquettes, firewood;
• thermometer - yes;
• connection of external control - yes;
• weight - 143 kg;
• price - 40370 rubles.

Advantages:

• fast heating;
• reliable assembly;
• simple control;
• the ability to purchase a burner;
• economical fuel consumption;
• stylish design.

Flaws:

• heavy weight;
• high price.

Stropuva S30 30 kW

A full-fledged solid fuel boiler with a power of 30 kW for heating a room of 300 m2. Equipped thermometer and safety valve.

Made of high quality steel, the material does not become red-hot when the boiler is heated.

The only boiler that continues burning up to 31 hours.

Characteristics:

• device - solid fuel boiler;
• power - 30 kW;
• area - 300 sq.m.;
• placement - outdoor;
• control - mechanical;
• contours - one;
• non-volatile - yes;
• combustion chamber - open;
• Efficiency - 85%;
• material - steel;
• fuel - firewood, wood briquettes;
• thermometer - yes;
• safety valve - yes;
• weight - 257;
• price - 89800 rubles.

Advantages:

• long burning;
• uniform heat;
• fast heating;
• quality materials;
• the presence of a thermometer;
• economical fuel consumption.

Flaws:

• high price;
• heavy weight;
• bulky.

Pellet boilers

Boilers working on pellets are difficult to attribute to any class, because they are usually discussed separately. The fuel for this type of boilers is small pellets made from compressed sawdust. A bunker is made for storing pellets near the boiler. Its size determines the battery life of the equipment. With enough space, the bunker can be made for several tons of fuel.The minimum size is for a couple of buckets, which is enough for a day of work.

Pellet boiler

The pellet heating boiler is equipped with a special burner. Pellets from the bunker are automatically fed into the combustion zone, where they burn almost without residue. Granules of normal quality give only 3-5% of ash. Therefore, cleaning is rarely required - once a week or even once every few weeks. The equipment is fully automated, with a sufficient supply of fuel, you can not visit for weeks.

But even here it was not without drawbacks. The first is the high price of equipment. The second is the exactingness to the quality of the pellets. They should have a low ash content, good calorific value, should not break and crumble. Otherwise, a pellet boiler for heating a private house is a good choice. Its plus is that waste from the woodworking industry is used.

The best foreign floor single-circuit boilers

Consider the most popular models of Western manufacturers:

Protherm Wolf 16 KSO

The brainchild of Slovak engineers, the Volk 16 KSO floor-standing boiler is designed for heating medium-sized private houses. With a power of 16 kW, it can heat 160 square meters. m.

Main characteristics:

• Efficiency - 92.5%;
• coolant temperature - 80 °;
• pressure in the heating system (max) - 1 bar;
• fuel consumption - 2.4 m3 / h;
• dimensions - 390x745x460 mm;
• weight - 46.5 kg.

The unit is non-volatile, which is atypical for European models - they prefer full-featured designs. In addition, it is equipped with a two-way heat exchanger, which increases the performance of the unit.

BAXI SLIM 1.230 iN

Italian boiler from a well-known European manufacturer. Its power is 22.1 kW, it is designed to work in a room of 220 sq.m.

Boiler characteristics:

• Efficiency - 90.2%;
• coolant temperature - 85 °;
• pressure in the heating system (max) - 3 bar;
• fuel consumption - 2.59 m3 / h;
• dimensions - 350x850x600 mm;
• weight - 103 kg.

The heat exchanger of this boiler is made of ductile cast iron, the warranty period is 2 years.

MORA-TOP SA 20G

Czech engineers offer users a 15 kW boiler capable of heating 150 square meters. m. area. The cast-iron heat exchanger stabilizes the operation of the system and equalizes the temperature, eliminating sudden jumps.

Boiler parameters:

• Efficiency - 92%;
• coolant temperature - 85 °;
• pressure in the heating system (max) - 3 bar;
• fuel consumption - 1.6 m3 / h;
• dimensions - 365x845x525 mm;
• weight - 99 kg.

An additional plus is the non-volatile design, which expands the capabilities of the unit in difficult conditions.

MORA-TOP SA 60

Another Czech boiler with a capacity of 49.9 kW. Suitable for heating a house of 500 sq. m., as well as for public or commercial premises.

Unit characteristics:

• Efficiency - 92%;
• coolant temperature - 85 °;
• pressure in the heating system (max) - 3 bar;
• fuel consumption - 5.8 m3 / h;
• dimensions - 700x845x525 mm;
• weight - 208 kg.

The boiler is equipped with a cast-iron heat exchanger consisting of 7 sections. Electronic control provides constant control over the mode of operation of the system.

Protherm Bear 40 KLOM

Slovak outdoor unit, whose power is 35 kW. Heating area - 350 sq.. m.

• Efficiency - 90%;
• coolant temperature - 85 °;
• pressure in the heating system (max) - 4 bar;
• fuel consumption - 4.1 m3 / h;
• dimensions - 505x880x600 mm;
• weight - 130 kg.

The design of the heat exchanger can be attributed to the features of the boiler - this is a cast-iron two-way assembly of 5 sections.

8Roda Brenner Classic BCR-03

A boiler in which combined heating is possible - not only with wood or anthracite, but also with gas, coke, diesel. The universal option is a good idea for those who do not know which heating to choose. The mechanical control minimizes the chance of breakage and also makes the operation of the boiler simple and straightforward.

Pros:

• Large window for laying fuel.
• High-quality thermal insulation of the product - the risk of burns is minimal.
• Two modes of air supply - using the regulator and manually.
• Ease of operation and maintenance.

Minuses:

• The boiler is combined, but the burner is purchased separately.
• For heating in the off-season, it is necessary to purchase a buffer tank.

This is interesting: Liquid fuel heating boilers - device, types, overview of models

The best hinged convection type boilers

This type of heating equipment can be called the most common. Not surprisingly, almost all buyers prefer these models. They combine ease of use, compact size, good performance and low price compared to condensing units.

1

Buderus Logamax UO72-12K

Convection boiler for double-circuit heating systems

Characteristics:

• Price - 32 445 rubles
• Customer rating - 4.8
• Max. power - 12 kW
• Efficiency - 92%
• Fuel consumption - 2.1 cubic meters. m/h

The model has a modern design, so it is often placed inside residential premises. Device with closed combustion chamber and built-in circulation pump.

The indisputable advantage of the model is high efficiency and a built-in expansion tank of 8 liters.The maximum temperature of the coolant reaches 82%, which is higher than most convection units. Frost protection, on indication and forced shutdown in case of overheating are provided.

Maximum heated area - 120 m2

Advantages:

• good performance;
• copper primary heat exchanger;
• capacious expansion tank;
• circulation pump;
• Possibility to connect external control.

Flaws:

• there is no safety valve;
• no built-in temperature controller.

2

Bosch Gas 6000W

High-quality double-circuit boiler of a well-known German manufacturer

Characteristics:

• Price - 32 450 rubles
• Customer rating - 4.7
• Max. power - 20 kW
• Efficiency - 92%
• Fuel consumption - 2.1 cubic meters. m/h

Characterized by high efficiency. Suitable for heating apartments and houses up to 200 sq. m.

The model is equipped with a closed combustion chamber. Can operate on both natural and liquefied fuels. The unit has a built-in expansion tank of 8 liters, which significantly increases the productivity of hot water.

The maximum temperature in the water supply circuit is 60 degrees

Advantages:

• compactness;
• modulating burner;
• built-in manometer, thermometer;
• work timer.

Flaws:

• high fuel consumption;
• inconvenient management;
• noise when using hot water.

3

BAXI ECO-4s 24F

High quality model from the Italian brand

Characteristics:

• Price - 31,570 rubles
• Customer rating - 4.6
• Max. power - 24 kW
• Efficiency - 92.3%
• Fuel consumption - 2.7 cubic meters. m/h

The double-circuit boiler, with a wall-mounted type of installation, has a stylish modern design.

Despite the convection principle of operation, it is characterized by a record efficiency indicator.The advantage of this heater is electronic control. The design includes an expansion tank with a volume of 6 liters.

BAXI ECO-4s 24F uses 2 types of heat exchanger - steel and copper

Advantages:

• low noise level;
• work from natural and liquefied gas in cylinders;
• built-in water filter;
• ease of operation;
• combined heat exchanger.

Flaws:

high fuel consumption.

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Advantages and disadvantages of equipment

Both types of gas boilers are easy to operate, efficient and durable. And they also have an attractive appearance.

The design of each type of gas boiler is designed to meet the needs of various categories of users, which clearly demonstrates their advantages and disadvantages. And also they make it possible to understand the differences between a single-circuit gas boiler and its double-circuit counterpart, helping potential buyer to make the right choice.

Pros and cons of single-circuit units

Such products are able to provide stable heating of premises of any size, number of storeys, remoteness from the heat exchanger.

And, in addition, single-circuit boilers:

• more reliable than their double-circuit counterparts, the design of which is more complex, which leads to a slightly larger number of breakdowns;
• easier to maintain, which is also caused by design features;
• cheaper.

An important advantage is that single-circuit units can become the basis for connecting other equipment. That will expand their functionality and increase the comfort of living.

You should always remember that if necessary, provide hot water in the premises, along with a single-circuit boiler, you will have to buy a storage boiler. And this will lead to significant additional costs. And a set of the listed equipment will take up a lot of space, which can be critical for small apartments.

Connecting storage boilers will provide the premises with hot water. Moreover, water will be supplied hot at any time, which is not always possible to achieve from double-circuit analogues.

In this type of equipment, in the absence of the need for hot water supply, there are no pronounced shortcomings. But otherwise, the lack of universality immediately affects. Which leads to the need to purchase an additional electric heater.

As a result, its joint operation with a single-circuit boiler leads to:

• high costs for the purchase, installation, maintenance;
• a limited amount of water for domestic needs - boilers are most often bought for sharing with single-circuit units, so the question may arise about the rational consumption of water, the volume of which depends on the storage capacity;
• greater load on the wiring.

The last drawback is relevant in cases where the house or apartment has old wiring or powerful electrical equipment is used in parallel. So, it may be necessary to upgrade the wiring and select a cable with a larger cross section.

You should also be aware that a set of a single-circuit boiler and a boiler takes up significantly more space than one double-circuit boiler.And with limited space, this can be a significant drawback.

Advantages and disadvantages of double-circuit boilers

Units that belong to the specified type with some restrictions, but are still capable of providing hot water to two systems at once (heating, hot water supply). They also take up less space than their boiler counterparts. As a result, double-circuit boilers are more convenient to use.

Both types of gas boilers are easy to operate, efficient and durable. And they have an attractive appearance.

In addition, the competitive struggle of manufacturers has led to the fact that the difference in the cost of both types of units is gradually leveled.

Therefore, today you can find a double-circuit boiler whose price exceeds that of a single-circuit product slightly. Which in some cases can also be considered an advantage.

If we talk about the disadvantages of double-circuit boilers, then the most important is the inability to instantly provide hot water of the same temperature to all points of water consumption in a house or apartment.

So, in their heat exchangers, the amount of water that is needed right now is heated. That is, the stock is not created. As a result, the water temperature may differ from what is expected or change during use. This happens when the pressure changes, for example, after opening / closing the second tap.

When using a double-circuit boiler, often the water temperature differs at two different points of water intake - hot water can be delivered to the desired point with a delay, and significant. Which is inconvenient and leads to additional costs

As for installation, the installation of double-circuit boilers is a more complicated procedure, especially at the design stage. Since you will have to follow the numerous recommendations of the manufacturer

How to choose a heat source - recommendations

If you have carefully studied the previous material, many questions have probably disappeared. Let's summarize our review of heat sources with general recommendations and tell you which boiler to choose in certain conditions:

Always start with energy availability. The best option for residents of the Russian Federation is gas heaters, wood-burning ones are in second place. In countries where the price of blue fuel is high, priority remains with TT boilers.
Count on 2 types of fuel. For example, liquefied gas and electricity at a nightly rate or firewood and electricity.
To provide a family of 2 people with hot water, a double-circuit heat generator is enough. If there are more residents, buy a single-circuit unit and an indirect heating boiler. An alternative option is to install a separate water heater.

Do not rush to purchase an expensive condensing boiler. Take a "aspirated" or a turbo unit - you will not lose in efficiency, but you will win in terms of initial and operating costs.
From solid fuel devices, we want to single out boilers of direct and long-term combustion. Pyrolysis plants are capricious, and pellet plants are too expensive. If you plan to fire with coal, be sure to choose a model sharpened for a high combustion temperature.
Steel TT-top burning boilers we do not recommend purchasing firewood of the "Stropuva" type

The units are not bad, but "famous" for significant shortcomings - freezing of fuel, the inability to load "on the go" and similar troubles.
It is important to properly tie solid fuel installations - to organize a small circulation ring through a three-way valve. Electric and gas heaters are easier to connect - they are not afraid of condensate in the furnace.

When choosing an electric boiler, give preference to products that heat the coolant with heating elements - the devices are reliable in operation, maintainable and undemanding to water.

Diesel, combined or pellet heating boiler choose as needed. Example: during the day you want to heat with coal, at night you want to use electricity at a cheap rate. Another option: the budget allows you to buy an automatic TT boiler, pellets are inexpensive, and there are no other energy sources.

Instead of a combined wood-electricity boiler, it is better to purchase 2 separate units and connect them in parallel with check valves