How to choose a boiler for a private home

Choosing the right boiler for private houses

Many visitors to the online store “Tekhnodom” turn to us with a request to perform a selection of heating boilers online. We are always ready to help them in this case, the more so that the range of our company includes many different types and models of equipment, suitable for literally any purpose. For example, if you need to select the gas boiler on the parameters, our consultants will gladly provide you with all the necessary information. Before you choose heating equipment, it is desirable to determine what criteria will be most important for you.

Boiler selection on parameters (area, power, fuel type)

Very often people make a selection of gas boiler for a private home on the area and volume of the room. This principle also works effectively with other types of boilers. Having such data, you can determine the optimal capacity of the equipment for your building. It is considered that the ideal value is 100 Watts per square meter. square meter of floor space. If you need to select the boiler for a private home, the price of this equipment can also be important

Finally, we advise you to pay attention to the type of fuel. and buy the boiler, the use of which will be the most profitable and less costly for you

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Selection of the gas heating boiler

For many of those who make a choice of gas boiler on the parameters, the cost of this technique can be very important, but not the only factor. You should also determine where to place it and whether it will be wall mounted or floor standing. Equally important is the factor of its energy dependence, the equipment can be self-contained or it is necessary to connect it to the mains. Finally, these models are single-circuit and double-circuit, the first provide only heating, and the second. heating and DHW heating. To understand all these subtleties you will be happy to help employees of the company “Tekhnodom”.

Selection of electric heating boiler

In addition to the selection of a gas boiler for a private house on the parameters, our customers are also interested in other varieties of these devices. For example, electric models are very popular. Such boilers should be chosen according to indicators of their power (this is a universal parameter for any model), type of connection (220V or 380V), the principle of power control (step or stepless), as well as the method of heating (TEN or electrode)

Each of the above criteria can play an important role, so we recommend paying close attention to all of them

Selection of solid fuel heating boiler

No less common are solid fuel heating boilers, many visitors to the online store “Tekhnodom” want to buy this type of product

Choosing them, we advise to pay attention to the fuel used by the boiler (coal, wood, pellets, pyrolytic boilers have great success), the method of loading (automatic or manual), the heat exchanger material, the combustion chamber volume, power consumption, etc.д. We are also happy to help you choose a two-circuit boiler for a boiler of indirect heating

The main parameters for selecting a gas boiler

There are a number of criteria on which to evaluate the model of the boiler purchased. It should be noted at once that almost all of them are interconnected and even interdependent with each other, so it is necessary to consider them at once and in a complex:

  • A key parameter. the total heat output of the gas boiler, which must meet the objectives of a particular heating system.
  • The place of the boiler future installation. this criterion will very often depend on the aforementioned capacity.
  • Type of boiler by layout. wall mounted or floor standing. The choice also depends on the power and the place of installation.
  • The type of boiler burner. open or closed. will also depend on these criteria. Accordingly, the system of combustion products removal is organized. through conventional chimney with natural draught or forced chimney system.
  • The number of loops. will the boiler be used only for heating needs. or will also take care of the hot water supply. If a two-circuit boiler is selected. its type by the structure of heat exchangers is taken into account.
  • The degree of dependence of the boiler on the energy supply. This parameter is especially important to take into account in those cases where power outages in the community occur with alarming regularity.
  • Of great importance may be additional equipment boiler elements necessary for efficient operation of the heating system, the presence of built-in control systems and ensure safe operation.
  • And finally, the company that produces the boiler, and, of course, the price, which will depend on many of the above factors.

How to choose: Gas boiler for private home heating

Frequent Houzz contributor, interior journalist. I have worked at different times as a reporter, editor, chief editor in different publications of the publishers in Moscow and Kiev.St. Petersburg. Actively wrote about interiors for the site 4living.

Gas boilers remain the most economical way to heat your home and get hot water. Let them be a little more expensive than electric and solid fuel boilers, but they pay for themselves due to the cost of fuel. Especially the main (not counting how much you have to pay for the connection).

Right Sizing a New Boiler the easy way

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Calculation of power, planning and installation of gas equipment. a serious matter, they should engage professionals. But the basics should know everyone who wants to switch to gas. We tell you how to choose a gas boiler for the house.

Floor standing or wall mounted gas boiler. which is betterThe type of installation gas boilers are divided into wall and floor. Those that are mounted on the wall, smaller and lighter, their weight usually does not exceed 80 kg. The capacity of wall mounted models rarely exceeds 35 kW, and the built-in boiler volume is 40 liters. This is a good option for a small house of up to 100 sq.m., which is ideal for apartment buildings.m. and not only because of the modest heating capabilities. Wall mounted boiler without a separate boiler does not need a separate room. it can be placed in the kitchen or bathroom. Many models have a closed combustion chamber, which allows you to bring the chimney into the wall.

Floor standing boilers are heavier. most models for houses weigh more than 100kg. Most often, such a device requires a boiler room, and it, in turn. compliance with all standards set out in the profile SNiP. There are regulated and the height of ceilings, and multiplicity of air exchange, and the size of the podium for the boiler. Most floor models have an open combustion chamber, which means that you have to provide a constant supply of air. But such units are on average more powerful than the wall-mounted ones.

The weak point of floor boilers. the heat exchanger. It is often made of steel to reduce weight and reduce the cost of the device. However, steel can not stand acidic condensate on the walls. Exchanger replacement is about half the cost of the boiler. Copper heat exchangers have a longer service life, but the price is higher.

Heavy weight is not a problem for floor standing boilers, which is why their heat exchangers are often made of cast iron. It is the ideal material: eternal (service life up to 50 years) and heat absorbing. The only disadvantage is its brittleness. In addition, there is evidence that cast iron does not react well to sudden temperature changes in the supply and return lines.

Choosing a wall or floor gas boiler, note that wall mounted boilers are more affordable also because they are equipped with circulation pumps and an expansion tank. Floor units are often sold without these parts, so you have to buy them separately.

Sometimes in the heating system of single-circuit boilers instead of water is poured antifreeze. but not car, but special. Unlike water, it does not leave scale and does not cause corrosion. that is to say it increases the life of the boiler and pipes. In addition, the water freezes at subzero temperatures and can rupture pipes, if the boiler fails in winter, and no one will be in the house. The antifreeze gets rid of this headache.

In a wall mounted gas boiler, especially two-circuit, it is better not to pour antifreeze. a high risk of deformation. And the leakage of antifreeze is a local environmental disaster. That’s why antifreeze is only suitable for floor models.

Conventional or condensing. which is more profitableWhich way of heating boilers are divided into convection (traditional) and condensing. In the first ones the fuel burns, heating water, and the gases go to the chimney. Their temperature is above 100 degrees, which saves the pipes from dangerous condensation. the gas escapes without cooling to the dew point. The efficiency of such a boiler. 90-100 percent. The highest efficiency of this type of devices have low-temperature boilers, but they work on the verge of condensation (steam falls out at 60 degrees). In itself, it is not so terrible, but connecting with the gases, it turns into acid, deposited on the walls of the chimney.

In condensing boilers efficiency is often over 110 percent (at least 98 percent), because it is not only the heat from the combustion of fuel, but also the energy released during the formation of condensate from water vapor. Cold water on the return flow takes the heat generated by cooling the gases. Such a system is more economical, provided that it is equipped with a sensor of street temperature. In addition, the condensing boilers uses a closed combustion chamber and coaxial chimney, which also saves fuel (compared to traditional, consumption is less than 20-30 percent).

The gases in the chimney does not heat up more than 80 degrees, so you can use cheaper plastic pipes. As a result, condensing boilers, though more expensive than convection, with the proper adjustment of the system can be more profitable. Although the range of such boilers in stores is much inferior to traditional.

Condensing boilers are often recommended for homes with underfloor heating. less variation in temperature between supply and return.

Single-circuit or double-circuit. how to choose a gas boiler for the house Gas boilers also differ by the scheme of heating. Single-circuit. it is a model with one line. Initially, this scheme is designed for heating a private home, including. warm floors.

Gas two-circuit boiler has two heat exchangers and is connected to two mains, independent of each other. One is responsible for heating, the other. for hot water. Hot water in this scheme can be provided in three ways: with a built-in tank, a flow-through water heater or a separate boiler. The latter option. if you need a lot of water, because the built-in tank rarely exceeds 60 liters, and the flow-through water heater is highly dependent on the head of cold water and does not allow the simultaneous use of multiple sources of hot water without loss of temperature. In this case, all methods are quite compatible. Most often boilers choose a volume of 100-200 liters.

It would seem that a large house and a large family automatically implies the use of a two-circuit floor or wall mounted boiler. And for a house where you come as a couple for the weekend, a single-circuit. But it is not so simple.

What is a gas boiler?

A gas boiler is a device that burns gas to produce heat, which is transferred to water used for space heating and possibly domestic hot water. In the boiler, gas is burned in a special combustion section, as a result of which the heat is transferred to the water through a heat exchanger. Domestic gas boilers are usually equipped with a pump, which provides circulation of heated water in the heating system (radiators, convectors, floor heating) of a house or apartment.

Combustion of natural gas produces CO2 and water vapor from the reactions between oxygen (O2) and gaseous carbon (C) and hydrogen (H). The latent energy of water vapor in flue gases is the equivalent of the energy required to convert the volume of water from liquid to vapor. The amount of energy corresponds to the difference between the higher and lower heating value of the natural gas (Hs, Hi). The Hs / Hi ratio for most natural gases (category H) is 1.10 to 1.11.

A condensing boiler is a unit designed to recover the latent heat from water vapor produced during the combustion of gas. In condensing boilers, the flue gases are cooled to the condensing temperature of the water vapor. All or part of the energy contained in water vapor is recovered. In such boilers, condensation occurs at temperatures below 60 ° C (dew point temperature), depending on how much additional air (excess air) is contained in the exhaust gases.

Excess air depends on the type of burner. Currently, all condensing boilers are equipped with full pre-mix burners. This means that the air used for combustion is mixed with the gas before combustion begins.

CO2 emissions are the main environmental impact of heating systems. They are quite low from burning natural gas compared to most other fuels, although higher than from biomass (e.g. wood). Emissions from liquefied natural gas are about 21% higher than from burning natural gas, for similar amounts of heat.

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Boiler installation

The floor standing boiler is a big thing. Prepare for the fact that in addition to the unit will have to find space for piping (installation of the pump and all its elbows, bushings, valves), the boiler (usually floor boilers. single circuit) and add here the distance according to the installation requirements. In short, prepare a whole furnace room for it, because such boilers are also quite noisy.

Floor standing boiler installation is complicated and therefore will be more expensive. For such gas equipment you need a vertical chimney. Keep in mind, the chimney is the weak point in floor standing boilers, it will have to be cleaned. However, if you need a really powerful boiler, you will most likely have to lean towards the floor standing version.

A wall mounted boiler usually takes up much less space than a floor standing boiler.

Wall hung boilers are easy and economical to install thanks to their compact parameters. The removal of combustion products can be done both through a vertical chimney or directly through the wall. But the disadvantages of these boilers include a relatively low heat output, not exceeding 35 kW, and less than long service life. While wall mounted boilers need to be serviced annually, the floor standing boilers need to be serviced once every 3 years. And all service is opening and sweeping everything out of the furnace.

Condensing boilers

Today, gas. the least expensive resource for heating, but bringing the pipeline to the house costs a pretty penny. Often owners of homes that are not gasified simply can not afford to pay for the laying of a branch line from the main line. But even if the gas in the house, the owners will not only make a project, but also to agree with the various supervisory authorities.

There are prerequisites for the installation of a gas boiler. a good ventilation system and removal of combustion products, which requires additional costs. Therefore, the anticipated future savings in energy costs are very appreciable initial expenses (even without cost of the gas boiler).

Smart electronics

There are a number of details that increase the safety of any boiler, although increasing the cost of equipment:

Flame presence sensor. this element automatically shuts off the gas supply if the flame goes out.

Blocking the boiler. useful in case of gas cuts.

Gas boiler: conclusions and tips

  • Entrust the first start-up of the boiler to a specialist.
  • Choose equipment that allows you to quickly get to its service center.
  • Do not forget to turn off the boiler during a thunderstorm. otherwise you may need to replace the burned out electronic circuit board.
  • To operate the boiler in the power grid, suffering from fluctuations, you will need to buy a voltage regulator.
  • Almost all manufacturers offer heating boilers in three price categories: economy, comfort and elite. Economy variant attracts customers with a minimum price, but if you can, it is better to buy a boiler of comfort class. Reliability and lifetime in this case is higher. such equipment is more profitable in financial terms. Elite boilers by their functionality practically do not differ from standard boilers. Choosing such a model, the buyer in most cases pays extra for prestige and brand image.

Keep in mind that this formula is designed for new buildings, in which the standard number of windows (new), doors, the building was originally intended for a particular activity and the corresponding production processes. Practice shows that buildings are often “old”, with poor insulation in some places, with cracks in the window frames and doors, and in the roof. It can happen that the building has been without heating for a long period of time, when the heat-insulating properties of the materials worsen considerably, etc.п. If this is your case the result you get from the formula should be multiplied by a number of factors. 1) Age factor of the building. If your building is up to 10 years old, the coefficient is 1. If 10 to 30 years old. 1.3. If the building is over 30 years old, you can safely multiply the calculated capacity by 1.5. 2) The building’s insulation coefficient. If the building is well insulated, there are no gaps in the windows, doors, gates, coefficient = 1. If you have at least one surface (walls, ceiling, floor) or element (windows, doors, gates) badly insulated, take coefficient = 1,3. If two or more of the elements are in poor condition, your coefficient is 1.5. Thus, for an old building with poor insulation the necessary boiler capacity may be 1.51.5 = 2.25 times higher.

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Important features of boilers

The heart of any boiler is a heat exchanger. It is heated in the combustion process and transmits the heat to the circulating fluid through pipes and radiators. Heat exchangers are most often made of steel or cast iron.

Heat exchanger made of cast iron is preferred for durability. with proper operation, they will last more than a dozen years. Cast iron is not afraid of corrosion and confidently withstands static loads.

Cast iron is a fragile material. If a crack occurs, it will not be possible to patch it, so cast iron boilers consist of sections. If there is a crack. the section is replaced.

Cast iron also does not like big temperature fluctuations. If the heating circuit is long, the water returns to the boiler completely cooled. this can cause cracking of the boiler. To avoid the thermal shock, in the boiler piping ensure the mixing of the leaving water into the incoming one, or use a hydrostring.

Single-circuit boiler. classic and reliable option. Depending on the tasks it can be equipped with additional equipment. If you buy a boiler of indirect heating, you will get hot water.

Two-circuit boiler gives a relatively inexpensive opportunity to get both heating and hot water. But this is an option for a small house with 1-2 people. Such a boiler is equipped with a second heat exchanger. for DHW, which is extremely sensitive to the quality of domestic water and can quickly fail because of the scale. Two-circuit boiler is more expensive than a single-circuit, but cheaper than a variant with a boiler.

Three-or more circuit systems are created on the basis of single-circuit boilers (there may be more than one). New circuits are added by means of distribution reservoirs. So you can connect and hot water and underfloor heating, and make a separate circuit for the second floor.

  • It is better to plan the heating system at the stage of house designing, but in most cases there are no unsolvable problems in ready houses.
  • Determine what functions you need from the heating boiler, then choose which solution is best for you.
  • Two-circuit boilers. a “two-in-one” option. You do not need a boiler, and have hot water. This is a relatively inexpensive option, but for one or two users and a small house.
  • Gas. the best option for heating. Sometimes you need to wait for gasification, in which case use an alternative. a diesel boiler with the option to convert to a gas boiler.
  • Solid fuel boilers are bought when there is no access to other types of energy.
  • Electricity is very convenient for heating, but it is obscenely expensive.

Need help installing, repairing or setting up the equipment. go to services.

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