Which boiler is better for a private house of 100 sq.m: tips for choosing, examples of models, prices

First of all, when organizing heating for a private home, you need to decide on the type of fuel used. This is the main criterion for choosing a boiler, on which further operating costs, autonomy and stability of the heating system depend.

Having decided on the type of fuel, you need to select the minimum required power, pay attention to the number of circuits, installation method, heat exchanger materials, method of air intake and exhaust of combustion products. Let's consider the entire process of choosing a boiler for a house with an area of 100 m2 one by one.

Fuel type: electric, gas, solid fuel or liquid fuel

For a home of about 100 square meters, any of the fuel types described below may be suitable. The choice should be made based on whether gasification was carried out in your area of residence, how accessible this or that type of fuel will be, whether there is enough space in the house for a large boiler or whether a compact one is required.

Gas.

The most affordable and popular type of fuel. It can be mainline or liquefied. Gas fuel is inexpensive, produces high heat transfer during combustion, and produces a relatively small amount of combustion products. Gas boilers are widespread. Many manufacturers have several series of such heating equipment (for example, Protherm Bear or Jaguar, Vaillant turboTEC or ecoTEC). There are floor and wall variations. Gas heating boilers for a house of 100 sq.m. have different prices (from 30,000 rubles and above), economy class, middle class and premium boilers that have additional functions and an increased service life are available for purchase. The efficiency of such boilers is on average 88-93%. Many service organizations and craftsmen service gas boilers, which simplifies repairs and finding spare parts.

Electricity.

Electric boilers are often used as a boiler for heating a house of 100 m2. Electricity is more expensive than gas, but it is an excellent option in areas where there is no gas supply. Modern electric boilers are affordable, but fuel costs can reach 5-10 thousand per month. Also, electric boilers for a 100 m2 house are very compact and low noise. As a rule, electric heating boilers are used for temporary residence in a country house.

Solid fuel.

These are coal, fuel pellets, firewood. Today, the share of houses heated with solid fuel is only 5-15% (in different regions). This heating equipment has a number of disadvantages: the need to prepare and store fuel, unstable heat transfer, the inability to work without the constant presence of a person, rapid contamination of the boiler, etc. In remote areas, solid fuel boilers for heating 100 m2 houses are still successfully used, since there is no gasification and stable electricity. To operate a solid fuel boiler, you need to systematically add fuel, but many modern models have an automated supply.

Liquid fuel (diesel, kerosene, fuel oil, etc.).

Quite efficient floor-standing boilers with good efficiency, which are not very common (about 10% of all boiler units) due to the need to install a separate boiler room. Also, liquid fuel heating boilers require a supply of fuel, which must be stored in a special tank.

Features of calculating boiler performance for apartments

Calculation of boiler power for heating apartments is calculated according to the same norm: 1 kW of heat per 10 square meters. But the correction is taking place according to other parameters. The first thing that needs to be taken into account is the presence or absence of an unheated room above and below.

if there is another heated apartment below/above, a coefficient of 0.7 is applied;
if the room below/at the top is unheated, we do not make any changes;
heated basement/attic - coefficient 0.9.

When making calculations, it is also worth taking into account the number of walls facing the street. Corner apartments require more heat:

if there is one external wall - 1.1;
two walls face the street - 1.2;
three external ones - 1.3.

You need to take into account the number of external walls
. These are the main areas through which heat escapes. It is imperative to take them into account. You can also take into account the quality of the windows. If these are double-glazed windows, adjustments need not be made. If there are old wooden windows, the found figure must be multiplied by 1.2.

You can also take into account factors such as the location of the apartment. In the same way, you need to increase the power if you want to buy a double-circuit boiler (for heating hot water).

Calculation by volume

In the case of determining the power of a heating boiler for an apartment, you can use another method, which is based on SNiP standards. They stipulate standards for heating buildings:

heating one cubic meter in a panel house requires 41 W of heat;
to compensate for heat loss in a brick building - 34 W.

To use this method, you need to know the total volume of the premises. In principle, this approach is more correct, since it immediately takes into account the height of the ceilings. A slight difficulty may arise here: usually we know the area of our apartment. The volume will have to be calculated. To do this, we multiply the total heated area by the height of the ceilings. We get the required volume.

Heating boiler calculations for apartments can be done according to standards

An example of calculating the power of a boiler for heating an apartment. Let the apartment be on the third floor of a five-story brick building. Its total area is 87 sq. m, ceiling height 2.8 m.

Finding the volume. 87 * 2.7 = 234.9 cu. m.
Round up - 235 cubic meters. m.
We calculate the required power: 235 cubic meters. m * 34 W = 7990 W or 7.99 kW.
Round up, we get 8 kW.
Since there are heated apartments at the top and bottom, we apply a coefficient of 0.7. 8 kW * 0.7 = 5.6 kW.
Round up: 6 kW.
The boiler will also heat water for domestic needs. We will give a reserve of 25% for this. 6 kW * 1.25 = 7.5 kW.
The windows in the apartment have not been replaced; they are old, wooden. Therefore, we use a multiplying factor of 1.2: 7.5 kW * 1.2 = 9 kW.
Two walls in the apartment are external, so once again we multiply the found figure by 1.2: 9 kW * 1.2 = 10.8 kW.
Round up: 11 kW.

In general, here is this technique for you. In principle, it can also be used to calculate the power of a boiler for a brick house. For other types of building materials, standards are not prescribed, and a panel private house is a rarity.

Heating boiler power for a house of 100 square meters

For a house or cottage located in central Russia in a temperate climate zone, the heating output of the boiler is 1 kW per 10 m2 of area. Therefore, for a house of 100 m2 a 10 kW boiler should be suitable. However, it is also necessary to take into account heat loss, efficiency of the heating unit and other factors. Typically, a boiler is purchased with a power reserve of 10-30% (depending on the type of fuel and other characteristics of the boiler and the heated building).

Therefore, for a house of 100 m2 you need to choose a boiler with a capacity of 12-14 kW.

You should not take a model that is too powerful (18 kW or more), as it will cycle frequently (turn on and off). In this case, there will be fuel losses, and the boiler unit itself will be subject to accelerated wear.

conclusions

In conclusion, here are some more general tips:

Funds invested in a boiler of a more reliable design (of a well-known brand), with a manufacturer’s guarantee, will pay for itself in the future.
The efficient operation of the heating system, and therefore the comfort in the house, depends not only on the gas unit. It is influenced by the level of heat loss, the material of the radiators, the length and type of pipes from which the main line is installed, and other factors.
When choosing a heating boiler, you will definitely need to consult with specialized specialists. There is no point in saving money on this.

Is a floor-standing or wall-mounted boiler better for a 100 m2 house?

There are models of heating units for installation on the floor and on the wall.

Wall-mounted boilers for a house of 100 m2. Compact and lightweight so as not to load the wall. More often they are equipped with copper, aluminum or steel heat exchangers. Wall-mounted models have a number of limitations. For example, their capacity is limited, but for a house of 100 sq.m. You can choose many models. There are also restrictions on working with antifreeze and on the quality of the coolant.
Floor-standing boilers. They often have a cast iron heat exchanger, which has an increased service life and is less susceptible to corrosion. They are distinguished by their rather large size and significant weight. Many models are non-volatile. Liquid fuel and solid fuel boilers can only be of the floor type. As a rule, such models have high power, which is not suitable for a small house of about 100 m2.

Efficiency - efficiency factor

Efficiency directly depends on the type of boiler and the fuel it consumes. The higher this indicator, the better.

Electric boilers have the highest efficiency - up to 99.5%. Gas models on average produce 88-95%, liquid fuel 85-90%, and solid fuel ones take last place - their average efficiency is 81-88%.

You might have seen on sale with efficiency above 100%. They do exist, but in this case the efficiency is shown relative to standard models of similar power. Condensation models, which also receive thermal energy from condensate, have an efficiency above 100%. Such boilers are expensive, but they are economical in terms of fuel consumption.

Is the combustion chamber open or closed?

An open combustion chamber in a boiler for a 100 m2 cottage involves the removal of combustion products using natural draft through a vertical chimney. In this case, the boiler takes air from the room. This option requires good ventilation. An open combustion chamber is found mainly in floor-standing models.

The closed combustion chamber operates thanks to forced draft and a coaxial chimney, which is purchased separately. This type of camera is more common in wall-mounted models, but can also be found in floor-mounted ones.

How to calculate power correctly

Firstly, it is worth mentioning that all our efforts to heat the house are aimed at heating the air in the interior to a comfortable temperature.

If we talk about comfortable temperature indicators, they are different for each individual person.

Some people feel great at a temperature of +19C, while others are already freezing at +22C.

However, +19C is considered the “healthiest” temperature for indoor living spaces.

So, our heat generator heats the coolant, which transfers this heat to the air in the premises of the house through underfloor heating pipes or through radiators.

The greater the boiler power, the more the coolant is heated and the more the air in the rooms heats up.

In this case, heat loss occurs - the air in the interior gives off heat through doors, windows, walls and ceilings. Warm air also escapes through the ventilation system.

Power control function and burner type for a boiler for a house 100 m2

This opportunity is relevant for gas boilers.

Single-stage
is the simplest option, allowing the heating unit to operate only at 100% power.
Two-stage
- provides two modes: 100% and 50% power.
Modulating
is the most modern and economical type of burner. Makes it possible to regulate power in steps of several kW (for example, switching occurs at 20%, 40%, 60%, 80% and 100% of power). In this case, the boiler operates constantly, no clocking occurs. Optimal gas consumption is achieved.

The best boiler models for a house with an area of 90-100 square meters

In our online store “Teplo-Comfort” you can purchase several boilers with suitable parameters. Below we will talk about the most popular models. This is a wall-mounted equipment with a power of 11-14 kW, running on both gas and electricity.

Gas wall-mounted boiler Protherm Cheetah 12 MTV

Power: 11 kW.

The boiler uses main gas as fuel and is designed to be placed on the wall. Double-circuit, suitable for heating and hot water supply. It has a closed combustion chamber and is compatible with a 60/100 mm chimney. Efficiency 93.2%. Built-in 5 liter expansion tank. The Gepard boiler has many modern functions (LCD display, frost protection, the ability to work in a “warm floor” system, etc.).

This boiler is suitable for a house of 90-100 m2 with good insulation.

Price: 61,640 rub.