The most economical gas boilers for home heating. Economical gas boilers: how to reduce gas consumption The most economical gas boilers with a capacity of 20 kW

Recently, new gas boilers have appeared called condensing boilers. In their technical characteristics, you can find some incomprehensible numbers - "Efficiency 109% !!!". It turns out that according to calculation methods that do not take into account the so-called latent heat during combustion, 109 - 111% of the heat of conventional combustion is actually obtained. With this play on words and numbers, sellers attract the attention of the buyer.

But the efficiency of the boiler depends not only on its efficiency. Condensing may not be a priority, as it is expensive in itself. Ultimately, the efficiency of the boiler is how much money was spent on heating the home.

Is it possible to reduce heating costs and how to do it - this is the main question that worries residents.

Let us consider in more detail which gas boiler will be economical, how to make heating cheaper with it.

Save on buying a boiler

Condensing boilers, like hot cakes next to cold ones, are offered at a price almost 2 times higher than that of conventional gas boilers of the same capacity.

But while there are disputes about why the price is high, let's pay attention to what they give condensing boilers eventually. They have an increased efficiency - 109 percent, compared to conventional wall-mounted gas boilers with closed camera combustion, in which 92 - 94%. But also, according to manufacturers, fuel savings with a condensing boiler can reach as much as 20%.

Due to what achievements

Condensing boilers must operate with a low coolant temperature - up to 50 - 60 degrees. Then they develop their "monstrous" efficiency, due to the additional energy released during the condensation of water vapor in the exhaust gases (the resulting liquid is drained into the sewer).

But the nuance is that low-temperature heating is more economical in itself - less hot air rises uselessly to the ceiling.

It is especially advisable to use such boilers with water warm floors, - an especially economical low-temperature heating system that distributes heat in the area where a person is located.

Those. the main savings are not in the design of the condensate boiler, but in the idea of low-temperature heating, in the system with which this boiler is designed to work.

Conclusion

It turns out that until the heating system in the house is converted to a low temperature (simply, the power of low and long radiators should be 30-40 percent more) and while there are no water-heated floors, then it seems to be not worth throwing a lot of money for this boiler .

But it must be borne in mind that with a conventional heating system in most medium-insulated houses, such a boiler will mainly operate in condensation mode during the season. How long will the fuel savings cover the difference in the price of boilers - you need to calculate in each case.

The general trend is also important - almost all of Europe is already “sitting” on such boilers and laws have been adopted there obliging them to use just such a technology for heating, which is also more environmentally friendly.

Design features affecting economy

All gas boilers fundamentally differ mainly in the combustion chamber - it is closed or open. Now only powerful floor standing boilers issued with an open chamber.

For purge, the natural draft of a high chimney is used, and the air is taken from the room. Wall-mounted boilers are made with a closed chamber operating under a fan, and air is taken from the street through a coaxial chimney (pipe in a pipe). At the same time, the supplied air has time to heat up.

In general, the closed combustion chamber of conventional boilers gives greater efficiency, more complete combustion of fuel in a well-functioning mode of operation. Boilers equipped with such a chamber are more efficient and economical. This is a well-known fact, and the preference is of course for devices with a closed camera.

For a gas boiler, power selection is important

Manufacturers recommend the optimal mode of operation of their equipment - the supply temperature and the return temperature are such and such, combustion is mostly continuous. Then the boiler works with normal efficiency, less unnecessary dew and soot are formed.

But if the owners have purchased a boiler that is too powerful, then it will not be economical at all. It will turn on and off frequently, its power will not be in demand, and a significant percentage of the time it will work in transitional periods. optimal modes(in the chamber heating mode - with dew and soot).

The gas boiler must be selected according to the optimal power so that it works in the specified mode. Then the boiler will be economical.

Experts recommend choosing a boiler 20 - 30% more than the maximum heat loss in the house. Then the equipment will not exit the operating mode, but its power will be mainly enough for unexpected draft cooling, and even for heating water by the same circuit in the boiler.

We create an economical mode of operation

Let's ask ourselves a question - is it not in vain that sometimes the boiler heats the air for us? It may be possible in some cases to reduce the temperature. Those. program the boiler so that it burns a little less fuel, but this would not affect the comfort in the house.

And here there are two reserves:

night mode - simply sets a lower temperature of the coolant or air in the room, depending on what the boiler is oriented to;
a system for responding to weather changes is created - a remote temperature sensor and a programmer are installed (if the boiler is not equipped with this). It also allows you to reduce the number of turns on when it's warmer outside.

Already these measures allow saving 10-15% of the flared gas.

Turn off heating in rooms

But the big savings are hidden in the point shutdown of rooms where to maintain
warmth is not required.

In most houses there are rooms in which you can not heat at least all winter or at a certain period of the day.

They will help to save thermal heads on pressure valves installed at the supply to each radiator. Now you can set the air temperature at which the radiator should turn off.

And electronic thermal heads allow you to program the process in time. Such a system allows you to save an average of 20% on heating, and in some cases even 50%. But thermal heads can only be used with an automated boiler so that overheating does not occur at certain points in the system.

The manufacturer matters

Do not forget that the very status of the manufacturer also speaks volumes. If we consider the products of a well-known European, Japanese, or Korean concern, then the declared characteristics of the boilers, their durability and verified operating modes can be trusted.

If, for no reason at all, we purchased products from an unknown gray manufacturer, then finding that something is wrong, including fuel economy, we should not be surprised.

The cauldron is a solid, long-lasting apparatus, and its acquisition must be taken seriously.

Which boiler will be more economical

Thus, the following boiler will be the most economical:

from well-known manufacturer middle price category;
wall-mounted with a closed combustion chamber;
optimal power, 20 - 40 percent more than heat loss (depending on the need to heat water for hot water supply);
connected according to all the rules of hydraulics, as well as using the programming of operating modes and thermal heads on radiators.

But if a warm water floor has already been debugged in the house, and low-temperature radiator heating would also be nice for it, then we should talk about buying a condensate economical boiler.

The most important nuance

True, there is one nuance that has not yet been discussed, and which can, in one fell swoop, tenfold cross out all the percentages of savings that we are trying to scrape together here with different methods.

There is no need to even talk about any efficiency of the boiler itself and the heating system if the building is not insulated. In a house that is not insulated, the bill for money for heating increases significantly.

Those. in a cold house, you will need a 2-3 times more powerful heating system to compensate for heat loss and develop an acceptable temperature inside. Another option is to freeze.

Only after insulating the building, no less than required by SNIP 23-02-2003, it makes sense to start talking about the efficiency of the equipment itself and consider condensation options ...

It is quite natural for any homeowner to want to save fuel for heating a private house. In particular, this applies to natural gas, which continues to grow steadily in price. The first step towards frugality can be taken at the stage of choosing a heat source, that is, purchasing the most economical gas boiler. How to make such a choice will be explained in our article.

What is the thermal energy of the gas used for?

Before you start choosing, you need to know a few important things about heating equipment. The natural gas that enters our homes through the mains must comply with the regulations and have a certain calorific value. This value shows how much heat is released when a unit volume of gas is burned. The task of the heating installation is to direct this energy as much as possible to heat the building. The better she does this, the higher the efficiency of her work.

For reference. In the post-Soviet space, it is customary to make calculations based on the lower or minimum calorific value of gas, its value is 8000 kcal / m3 (33500 kJ / m3).

The efficiency of the heat generator, or otherwise, - its efficiency is expressed as a percentage of the calorific value of the fuel. In simple words, efficiency value gas boiler shows what part of the heat of combustion of the fuel he manages to transfer to the house. The larger this part, the more fully the energy carrier is used, you pay less for losses, which means that efficiency increases. Between the two terms "efficiency" and "economical" you can put an equal sign.

A little about the process of burning natural gas. It is quite complicated, but we will not go into details, but will highlight the main substances formed as a result of the process. In the case when sufficient oxygen is supplied and created ideal conditions for combustion, carbon dioxide (carbon dioxide CO2) and ordinary water are released. Now we list what the thermal energy of the fuel is spent on in the boiler plant:

for heating the coolant;
for losses with outgoing flue gases;
for the evaporation of water formed during chemical reaction burning.

The most efficient and reliable gas boilers operate in such a way that the first item of energy consumption is maximized, and the other 2 are minimized.

How to determine the efficiency of the boiler?

Before giving specific recommendations on choosing an economical heat generator, let's clarify some points. The efficiency of modern installations burning natural gas lies in the range of 90-98%. The lowest rate is for inexpensive non-volatile models with a one- or two-stage burner device. Modulating burners with electronic control and forced air injection work better, where the power is regulated smoothly, and not in steps. But one must understand that the burner only burns fuel, and the transfer of heat is the task of other elements of the boiler.

Initially, the heat released in the furnace directly heats the water jacket of an economical gas boiler. The rest of the heat, together with the flue gases, enters the steel or cast iron heat exchanger. This is one of the most important stages, it is here that the combustion products transfer part of the remaining energy to the water, after which they flow into the chimney. The share of heat that got there is irretrievably lost, leaving in the atmosphere.

How large this proportion is, shows the temperature of the flue gases, indicating the efficiency of the boiler. If the gas temperature at the outlet of the unit is 200 degrees or more, then you are not too good design heater. It allows too much heat to escape outside. If the temperature of the combustion products is in the range of 100-150 ºС, then this boiler can already be considered as an acceptable option.

Gas-fired condensing boilers give the best flue gas temperatures. This is realized by removing the heat of vaporization of water. IN previous section we said that the water released as a result of a chemical reaction evaporates, taking away part of the heat of combustion of natural gas. So, the most economical boilers are able to take this energy back by condensing the resulting water vapor.

For this purpose, the unit uses a cylindrical type burner installed inside a stainless steel heat exchanger. The latter is a coil, where the turns are close to one another, and the coolant circulates inside. The steam has no other way but to pass through this coil and condense on its surface, giving off heat. The flue gas temperature of condensing heat generators is record low - from 45 to 70 ºС, and the efficiency reaches 98%.

Determining which gas boiler is the most economical is actually not difficult. These are the condensing units that are mentioned above. Another thing is that they cost a lot of money, like all high-tech devices. The availability of such an acquisition for many homeowners remains in question, so we take the liberty of giving general recommendations for the successful selection of the heating system. First, let's dispel one myth.

Sales representatives of some brands, offering condensing heat generators for heating, use one marketing ploy. Talking about the process of taking heat from water vapor, they declare the efficiency of the unit at the level of 109%. The rationale is this: the efficiency of a standard boiler is 98%, and due to condensation, another 11% is added to it. A simple calculation gives a result of as much as 109%. This shows the picture:

In fact, the efficiency can never be more than 100%, these are the basic laws of physics. After all, the fuel, burning, releases a certain amount of thermal energy. A small proportion of it is spent on the evaporation of water, and the boiler simply returns it back, preventing it from flying into the pipe. Ideally, its efficiency would be 100%, but no more. In practice, even the most expensive and economical gas boilers for a private house can give 98% on the strength.

When choosing a heat generator, you should ask for its technical passport and pay attention to:

the efficiency value specified in the documentation;
the temperature of the flue gases at different operating modes of the unit;
heat exchanger design. The more moves inside it make the products of combustion of fuel, the better;
quality and thickness of the heat-insulating layer of the water jacket.

If, due to the nature of operation, you need a simple non-volatile unit, then you need to understand that its efficiency cannot be as high as that of a condensing boiler. You will have to rely entirely on the efficiency of the heating system and good insulation building. And in order to additionally remove heat from flue gases, you can purchase a water economizer. It is installed on the chimney and heats the water flowing through the return pipeline.

Conclusion

Modern gas boilers are quite efficient devices; in terms of efficiency, they lose only to electric heat generators. But the degree of efficiency of the units is very dependent on the presence of high-tech elements in them, and hence on the cost of the product as a whole. The same condensing boilers are as economical as they are expensive. At the same time, a simple budget unit can quite satisfy you, besides, it is able to work on both natural and liquefied gas.

A heating gas boiler is a device that, by means of the combustion of fuel (natural or liquefied gas), heats the coolant.

The device (design) of a gas boiler: burner, heat exchanger, thermally insulated housing, hydraulic unit, as well as safety and control devices. Such gas-fired boilers require a chimney to be connected to remove combustion products. The chimney can be either a conventional vertical or coaxial (“pipe in pipe”) for boilers with a closed combustion chamber. Many modern boilers equipped with built-in pumps for forced circulation of water.

The principle of operation of a gas boiler- the coolant, passing through the heat exchanger, heats up and then circulates through the heating system, giving off the received thermal energy through radiators, underfloor heating, heated towel rails, and also providing water heating in the boiler indirect heating(if it is connected to a gas boiler).

Heat exchanger - a metal container in which the coolant (water or antifreeze) is heated - can be made of steel, cast iron, copper, etc. The reliability and durability of a gas boiler depends on the quality of the heat exchanger in the first place. Cast iron heat exchangers are resistant to corrosion and have a long service life, but are sensitive to sudden temperature changes and are quite heavy. Steel containers can suffer from rust, so their internal surfaces are protected with various anti-corrosion coatings that prolong the “life” of the device. Steel heat exchangers are the most common in the manufacture of boilers. Corrosion is not terrible for copper heat exchangers, and due to the high heat transfer coefficient, low weight and dimensions, such heat exchangers are often used in wall boilers, but of the minuses, it should be noted that they are more expensive than steel ones.
In addition to the heat exchanger, an important part of gas boilers is a burner, which can be various kinds: atmospheric or fan, single-stage or two-stage, with smooth modulation, double.

To control the gas boiler, automation is used with various settings and functions (for example, a weather-compensated control system), as well as devices for programming operation and remote control of the boiler.

Main technical specifications gas heating boilers are: power, number of heating circuits, type of fuel, type of combustion chamber, type of burner, installation method, presence of a pump and expansion tank, automatic control of the boiler.

To determine required power gas heating boiler for private country house or an apartment, a simple formula is used - 1 kW of boiler power for heating 10 m 2 of a well-insulated room with a ceiling height of up to 3 m. the gas boiler output must be increased. It is also necessary to increase the power (about 20-50%) when providing a gas boiler and hot water supply (especially if water heating in the pool is necessary).

A feature of calculating the power of gas boilers: the nominal gas pressure at which the boiler operates at 100% of the power declared by the manufacturer for most boilers is from 13 to 20 mbar, and the actual pressure in gas networks in Russia can be 10 mbar, and sometimes even lower . Accordingly, a gas boiler often works only at 2/3 of its capacity, and this must be taken into account when calculating. In more detail with a table for calculating the power of a heating boiler, you can

Most gas boilers can switch from natural gas to LPG(ballooned propane). Many models switch to liquefied gas at the factory (check these characteristics of the model when purchasing), or nozzles (jets) are additionally supplied to the gas boiler to switch to bottled gas.

Pros and cons of gas boilers:

Boiler piping- These are devices for the full operation of the heating and water supply system. Includes: pumps expansion tanks, filters (if necessary), manifolds, non-return and safety valves, air valves, valves, etc. You will also need to purchase radiators, connecting pipes and valves, thermostats, a boiler, etc. The issue of choosing a boiler is quite serious, so it is better to entrust the selection of equipment and its complete set to professionals.

What is the best boiler? The Russian market of gas boiler equipment has its own leaders in quality and reliability. The best manufacturers and brands of gas boilers are presented in the assortment:

"Premium" or "Lux"- the most reliable and durable, easy to manage, the kit is assembled as a "constructor", more expensive than the others. These manufacturers include German companies

Most buyers are trying to purchase an economical floor-standing gas boiler for their home, since gas is not cheap today. But, in addition to fuel consumption, there are many criteria by which the unit is considered economical. This is the service life, and the operation of the weather-dependent system, and the efficiency of the unit.

The efficiency of a gas unit directly depends on its service life. Boilers with cast-iron heat exchangers are able to work the longest - their service life is 30-40 years. However, they can "live" for so long only with careful handling. Cast iron is brittle and must be handled with extreme care. It is also necessary to avoid getting cool water on the surface of the hot heat exchanger, as the temperature difference will lead to cracks.

Floor-standing units with steel contours are not as capricious as cast-iron ones, but they are much more susceptible to corrosion. Because of this, steel elements fail faster.

Also, the operational period depends on the availability of spare parts for sale and the quality of the heating equipment. Therefore, when buying a unit of a certain brand, you should ask if it is easy to find accessories for it. As for the manufacturer, German and Slovak units work the longest. Domestic analogues fail faster, but they are better adapted to difficult Russian operating conditions and will cost less.

Note! Many manufacturers recommend installing a voltage stabilizer for their gas boiler. This is a condition for continued warranty service.

Some owners of floor gas boilers try to save on maintenance and do not call a specialist for scheduled repairs. However, during operation, the focus of the burner may shift, soot may appear and other minor malfunctions may occur. If they are not eliminated in time, then fuel consumption will increase, and the performance of the unit will decrease. Therefore, it is better not to save on service.

How does automation make a gas boiler more economical?

The efficiency of a gas unit is also affected by the ability to reduce and increase productivity during operation. Modern weather-dependent systems are able to reduce the intensity of combustion depending on the temperature outside or in the room. This significantly reduces gas consumption and, accordingly, the cost of it.

Some modern systems automation can be set to work for a day or a week. You can set the operation of the gas unit so that at night the temperature in the room is lower.

There are floor gas boilers with these types of burners:

single-stage - has one power level;
two-stage - two power levels;
modulating - several power levels.

The last type of burner is considered the most economical, as it has the ability to smoothly switch to different power levels.

Efficiency of outdoor gas units

The main indicator when choosing an economical gas boiler for organizing home heating is the coefficient useful action- efficiency. Its value for outdoor gas units lies in the range of 84-99%. Low-cost devices equipped with a one- or two-stage burner have a low rate. Boilers work more efficiently, in which the power can change smoothly, depending on weather conditions.

The heat that is obtained as a result of gas combustion heats the heat exchanger with the heat carrier. After that, the remaining heat passes into the chimney and irrevocably goes into the atmosphere. The amount of heat lost is shown by the flue gas temperature. If the smoke is heated to 200°C or more at the outlet of the nozzle, then this unit is not considered economical. The best option- flue gas temperature within 100-150 °C.

Condensing gas boilers

The condensing unit is considered the most economical floor gas boiler for the home. This is possible thanks to a special technology for extracting heat from the resulting moisture. To do this, a floor-standing gas boiler is equipped with a cylindrical burner, which is located inside a stainless steel heat exchanger. It is made in the form of a coil with tightly packed coils. Water vapor condenses on the heat exchanger, the heat from which also heats the coolant. Due to this, thermal energy is maximally spent on heating the heat exchanger. The efficiency of such units is 97-99%.

Note! If, due to problems with electricity, you decide to purchase a non-volatile gas boiler, then keep in mind that it will not be economical. For such boilers, the efficiency rarely exceeds 91%.

The cost of floor gas boilers

Another important selection criterion is the price of the device. Condensing models are much more expensive than convection models. It is better to purchase a boiler that can work on both natural and liquefied fuels.

Basically, devices of an affordable price category include models with low efficiency. More efficient units, especially foreign-made ones, are more expensive.

If you cannot afford condensing-type heating devices, you can purchase a cheap domestic boiler with low fuel consumption.

A growing number of people are willing to pay extra money for the increased consumption during heating of a private house or apartment. Hence the demand for economical gas boilers, designed to replace old heating units or take a place in the boiler rooms of new buildings.

But try to figure out which boilers are the most economical and how to choose among them. suitable model. Homeowners often fall for the bait of unscrupulous sellers and buy more expensive body generators. In the publication, we will give explanations about the efficiency of gas boilers, study them before going to the store.

What determines the economy

An ideal gas heating boiler must first effectively burn the main or liquefied gas, and then direct all the heat received to heat the coolant for the heating system. In reality, not everything is so smooth, and here's why:

For efficient combustion of fuel and obtaining the maximum amount of heat, gas and air must be mixed in clear proportions (approximately 1: 10). Not every heat generator can do this.
During the combustion of methane, carbon dioxide is released and plain water, which immediately evaporates, taking away part of the thermal energy of the burned fuel.
The heated combustion products a priori cannot transfer all the energy to the coolant, some of it will still fly out into the chimney. The value of this part depends on the design of the heating unit.

The efficiency of non-volatile double-circuit boilers "Atem" with an open combustion chamber lies in the range of 86 ... 88%

It turns out that one part of the energy contained in the fuel is lost during the combustion stage, and the other part is lost during heat transfer. The smaller these losses, the more rationally the energy of the fuel is used and the more economical the gas boiler for the house. The efficiency of the heater is characterized by its efficiency, indicated in the technical data sheet for the product. The higher this indicator, the more heat the heat generator directs to heat the coolant and consumes natural gas more economically.

The efficiency of modern gas boilers depends on their design and ranges from 85 to 96%. The higher efficiency figures voiced by the sellers of thermal equipment do not correspond to reality.

Evaluation of the efficiency of different heaters

When choosing, the task is somewhat wider than just choosing the most economical gas boiler. It is important that it matches the conditions of your country house or apartment and fits the heating system. Solving the problem is impossible without understanding what types of heat generators exist and how they differ from each other. Now the market offers 3 types of gas-using units:

atmospheric, with an open combustion chamber;
pressurized (otherwise - turbocharged), with a closed combustion chamber;
supercharged condensing.

Wall (left) and floor (right) model of a gas heater

The listed varieties are produced in execution. Only among aspirated can you find the so-called parapet (wall) models, with a side chimney that goes out horizontally through the wall. There are double-circuit modifications of boilers designed to provide hot water 2-3 consumers in a private house.

Floor or wall mounting does not affect the power or efficiency of the gas boiler. Only the design and principle of operation of the heat generator matters, so each variety should be considered separately.

Units with an open combustion chamber

These gas boilers cannot be classified as the most economical, since their efficiency rarely exceeds 85%, and the temperature of the gases at the outlet into the pipe reaches 150 ° C. The reason lies in easy way combustion of fuel with free air supply from the room where the unit is located. With an excess of air in the air-fuel mixture, not the most Better conditions combustion, which negatively affects the efficiency of the heater. The high temperature of the combustion products indicates insufficiently efficient heat transfer and heat loss.

Scheme of a floor-standing atmospheric boiler with a cast-iron heat exchanger

There is another point. Most burners installed in inexpensive atmospherics can operate in one mode. Simply put, to maintain the set temperature of the coolant, the burner periodically turns on and off. This the simplest algorithm work, but not the most economical. However, these boilers are very popular for the following reasons:

the lowest price;
independence from the presence of electricity in the house;
simplicity and reliability of the design, the absence of electronics.

Note. Not all atmospheric boilers are non-volatile. There are many models from different manufacturers equipped with controls and powered by the mains. But from the presence of these funds, the efficiency of the thermal unit does not become higher.

The burners of outdoor atmospheric boilers are paired with non-volatile automation

For a private house with an open gravity-fed heating system, no the best option how to choose an atmospheric gas boiler that does not need electricity. Even despite the relatively low efficiency. Such systems exist in order to heat private houses in areas with unreliable power supply. No one will think about saving when, during a power outage, a high-tech boiler stops and the house starts to freeze.

Turbocharged heat generators

Scheme of a wall-mounted heat generator with forced air

Closed combustion chamber and forced filing air, implemented in such units, unequivocally improve the conditions for burning both natural and liquefied gas. Unlike atmospherics, the following types of burners are used in pressurized heaters:

two - and multi-stage;
modulation.

The bottom line is that when the set coolant temperature is reached, such burners switch to the lowest stage of combustion intensity (first type) or smoothly reduce power to a minimum (second type). That is, the electronic control unit of the gas boiler independently regulates the power of the burner, depending on the heat load or the appearance of a request from the DHW system. Hence the higher efficiency of a pressurized double-circuit boiler - 90-92%.

Judging by the reviews on the forums, wall-mounted turbocharged heating units occupy the first position in the field of individual heating of apartments. But not at all because of the high efficiency, but thanks to the coaxial chimney, which goes out horizontally through the wall. This eliminates the need to arrange a traditional chimney or connect the boiler to a ventilation shaft, which is strictly prohibited by the rules.

Condensing boilers

In fact, these are the same turbocharged heat generators with a closed chamber, only with a higher efficiency - up to 96%. It is achieved due to the closed design of the heat exchanger surrounding the cylindrical burner on all sides. In this way, it is possible to return and use the heat of vaporization selected in the combustion process. The escaping water evaporates when high temperature in the combustion zone, after which the steam from contact with the heat exchanger condenses and returns energy back.

A condensing gas boiler is an unequivocal answer to the question of which heat source is better to choose in terms of efficiency. Provided that your Vacation home is supplied with electricity without interruption or you have an alternative source - an uninterruptible power supply or an electric generator.

Like forced air heating units, condensing boilers cannot function without electricity.

Since these heat sources are high-tech, their price is quite high. This is the only significant drawback of heat generators; in terms of other indicators, they are beaten only by electrical installations with an efficiency of 99%. Judge for yourself: the flue gases leaving the condensing boiler have a temperature of no more than 70 ° C, which indicates the smallest losses and the best heat extraction in favor of the water heating system.

Due to the condensation of water vapor, the heat generator effectively uses the heat of combustion of gas

Which gas boiler is better to choose

This section is intended to link all previous discussions to real life because theory and practice are two different things. Theoretically, everything is correct, the most economical gas boiler with the highest efficiency is condensing. But having learned how much this miracle of technology costs, not everyone will dare to buy it. And is there such a need?

Take the same gravity system, which does not need pumps, automation and electricity. It is not advisable to buy an expensive heat source for it, although a turbocharged or condensing heat generator will cope well with such a system. It will simply force the coolant to circulate forcibly from its own pump. The issue is the reliability of power supply and the decent price of equipment that will pay off no one knows when.

It is also not very reasonable to buy a condensing boiler for a small house of 100 sq. m area with any heating system. On such an area, you are unlikely to feel the economy compared to an inexpensive aspirated. You can see the real difference if country cottage over 300 sq. m, first heat with a simple boiler, and then change it to a condensing one.

Final Conclusion

When choosing a gas boiler, do not focus on efficiency, be guided common sense. You don’t have a chimney in your house - take a turbocharged heat generator, it’s bad with electricity - a non-volatile aspirated. If you have a cottage on 2-4 floors - definitely install a condensing boiler. Profitability is also achieved in other ways, for example, by simply insulating a building.