Boiler capacity for a house of 200 square meters

Selecting the appropriate boiler capacity is an essential choice for effectively and economically heating a home. This choice assumes even greater significance for a 200 square meter home. The capacity of the boiler has an immediate effect on the heating performance, energy costs, and comfort level of your house. It is crucial to comprehend the variables that affect the right boiler size for your house.

The size of your home is one of the main factors to be taken into account when determining boiler capacity. A 200-square-meter home is categorized as medium to large, meaning that a boiler with sufficient heating output is needed to keep the interior at a comfortable temperature all year long. However, choosing the appropriate boiler capacity depends on more than just size; other considerations include the number of windows, the insulation level of the home, and even the climate in the area.

Efficiency is yet another important consideration. Various efficiency ratings are available for modern boilers; choosing a more efficient model can result in long-term energy bill savings. Although it could be alluring to select the biggest boiler on the market, an oversized boiler can result in inefficiencies and higher energy usage. However, a boiler that is too small for your needs could find it difficult to heat your home, particularly in the winter.

Finally, seeking advice from professionals or subject-matter experts can yield insightful information catered to your particular requirements. They are able to evaluate the heating needs of your house, take into account all pertinent information, and suggest the best boiler capacity. You can optimize energy consumption and expenses while maintaining a warm and comfortable home with the correct boiler installed.

House Size Boiler Capacity
200 sqm 24-30 kW

What heating boiler is suitable for a house of 200 square meters.м?

A 200 square meter home "loses" at least 24–25 kW of heat during the winter. After all, 41 watts of thermal energy are lost for every cubic meter of living space. Additionally, the total volume of living space in a 200 "square" house with a ceiling height of roughly 3 meters is up to 600 cubic meters. In the end, 24.6 kW is 600×41:1000.

Furthermore, such a home is typically constructed for a family of four to six people. Thus, the heating device will need to "generate" up to 180-200 liters of hot water in addition to making up for heat losses. The boiler’s heat output for a 200-square-foot house is the most important factor. м. is limited to a maximum of 30 kW.

Naturally, the cost to the home’s owner of producing such a large "portion" of thermal energy will be high. In order to choose the best boiler model, a homeowner must consider the heater’s thermal capacity as well as energy efficiency, or its capacity to supply the heating system with fuel calories burned while minimizing losses.

Warming a personal residence

In short, you need a two-circuit boiler for 30-35 kW with the highest efficiency factor, "fed" by the least expensive fuel, for a 200 "square" house.

For effective heating and comfort in a 200-square-meter home, the boiler capacity must be selected carefully. This kind of house usually needs a boiler that can sufficiently supply its heating needs without wasting energy. The insulation level of the home, the number of occupants, and the climate can all affect how big a unit you need. To find the right capacity and ensure that your house stays warm during the winter while also being energy-efficient and reasonably priced over time, it is imperative to speak with heating professionals.

Gas, wood, coal, electricity – what is cheaper??

In the medley Natural gas is the least expensive fuel for the boiler. With a calorific value of 43,000 kJ per cubic meter of fuel and 91 percent efficiency, just 2.75 cubic meters of this kind of fuel are required to produce 30 kW. In the European portion of Russia, a thousand cubic meters of gas cost roughly 5,000 rubles in 2015. Thus, the "production" of 30 kW using a gas boiler comes at a maximum expense of 13.75 rubles.

The cost of heating with hard coal burned in a solid fuel boiler’s furnace is slightly higher. Eight kilograms of coal are required to produce 30 kW (assuming an efficiency of 80% and a calorific value of 17,000 kJ per kilogram of fuel). A ton of regular hard coal cost roughly 4,000 rubles in 2015. A coal-fired boiler that generates 30 kW costs 32 rubles. Ultimately, somewhere will need to be used to store the coal. Moreover, the cost of delivering this fuel is high.

The cost of heating a home solely with wood would be significantly higher. With a solid fuel boiler filled to capacity with dry wood that has a calorific value of one kilogram at a level of 14,000 kJ, nearly ten kilograms of wood will be needed to produce thirty kW, assuming an 80 percent boiler efficiency. A cube of firewood (650 kilograms) could have cost up to 3000 rubles in 2015 when it was delivered to the home in the form of a packed stack. Therefore, using a wood boiler to generate 30 kW will cost 46–47 rubles.

Even with a 99 percent efficiency rating, an electric boiler for a 200 square meter home is a surefire way to fail. Ultimately, a kilowatt heated by electricity costs 2.4 rubles. Consequently, it will cost 73 rubles to generate 30 kW!

Gas boiler with two circuits for a 200 square meter suitable with thermostats that can be programmed. A 10-liter hydraulic accumulator, a three-way valve, and a three-speed pump—its own pressure unit—are all included with this heater.

Additional features of the model include:

Heat exchanger-equipped turbine gas boiler for hot water heating. There is space in the body of this model for a bypass as well as an expansion tank and a pump. Stainless steel is used to make the boiler’s burner and heat exchangers.

Wall-type, chimney gas boiler with a 60-liter boiler and a hot water supply circuit. This boiler’s pressure unit consists of two pumps: one for the heating system and another for the hot water system.

Additional features of the boiler:

Solid fuel boilers for a house of 200 "squares" – a review of popular models

200 square meter single-circuit solid fuel boiler with the option to connect a heat accumulator and an indirect heating loop for district heating water (DHW). Coal and firewood are sources of energy used by the boiler. Additionally, a full load of firewood burns for at least two hours, while coal can burn for up to four hours.

  • Thermal capacity – 32 kW on coal or 29 kW on wood.
  • Capacity of the heat accumulator – up to 1350 liters.
  • Control – mechanical (draught regulation by means of a throttle flap).
  • Cost – up to 60 thousand rubles.

A 200 square meter house with a pellet boiler that can be connected to the hot water supply system. Furthermore, this heating device has a hopper that automatically fills with fine-fraction coal or granulated wood (pellets). There is enough hopper capacity for three days of work.

Additional features of the boiler:

  • Heat output – 30 kW.
  • Daily consumption of pellets – up to 72 kilograms.
  • Recommended volume of coolant in the system – up to 150 liters.
  • Cost – up to 145 thousand rubles.

Also we recommend to read:

Selecting a type of parapet gas boiler Which heating boiler is best for a 150 square kilometer home? Which type of heating boiler is best for a 100 square meter home? м. A comparison of models to find the best solid fuel boiler for a private home

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Do the correct calculation of the capacity of the gas heating boiler

How to choose the capacity of the boiler on gas

There are three different methods for calculating the power of the local gas heating boiler:

  • Accurate thermal calculations are performed only after an audit of the building for possible heat loss. For the study, a thermal imaging camera is used. The location of the heated building is taken into account. Calculations are performed using complex thermotechnical formulas.
  • Minus of the solution – the cost of paying for the services of a specialist.
  • Advantage – the most accurate results of calculations.

European manufacturers frequently use the room’s volume to determine how well boiler equipment performs. As a result, the technical documentation indicates in m³ the possibility of heating. When selecting a unit made in an EU country, this factor is taken into consideration.

The majority of consultants who sell heating equipment determine the necessary capacity on their own by applying the equation 1 kW = 10 m². Further computations are performed based on the volume of coolant in the heating system.

Calculation of a single-circuit heating boiler

As was previously mentioned, the formula 1 kW = 10 m² is used to perform independent calculations of the heating equipment’s operating parameters. Add 15–25% of the reserve to the result to ensure that the heat generator does not run at full load—even during extremely cold temperatures—thereby prolonging its operational life.

For instance, you can figure out how big a private home’s gas boiler room needs to be:

  • For 60 m² – to meet the need for heat will be able to unit at 6 kW + 20% = 7.5 kilowatts. If there is no model with a suitable performance size, preference is given to heating equipment with a larger capacity value.
  • Similarly, calculations are performed for 100 m² – the required capacity of the boiler equipment, 12 kW.
  • For heating 150 m² you need a gas boiler with a capacity of 15 kW + 20% (3 kilowatts) = 18 kW. Accordingly, for 200 m², a 22 kW boiler is required.

Only single-circuit models that aren’t connected to an indirect heating boiler can use these computations.

How to calculate the output of a two-circuit boiler

The following formula can be used to determine how much power a two-circuit gas boiler needs for the heating and DHW water points: 10 m³ = 1 kW + 20% (water heating) + 20% (power reserve). It turns out that you should immediately add 40% to the computed performance.

A two-circuit gas boiler will have a power of 25 kW plus 40% (10 kilowatts) = 35 kW for heating and hot water heating for 250 m². The computations work with equipment that has two circuits. Use a different formula to determine the performance of a single-circuit unit linked to an indirect heating boiler.

Calculation of indirect boiler and single-circuit boiler capacity

The following steps must be taken in order to determine the necessary capacity of an indirect heating boiler with a single-circuit gas boiler:

  • Determine what volume of boiler will be sufficient to meet the needs of the inhabitants of the house.
  • In the technical documentation to the storage tank, the necessary capacity of the boiler equipment is specified to maintain the heating of hot water, without taking into account the necessary heat for heating. A boiler with 200 liters, on average, will require about 30 kW.
  • Calculates the performance of boiler equipment required for heating the house.

The numbers that are obtained are totaled. Twenty percent is deducted from the outcome. This is necessary since heating and DHW cannot be done at the same time on the heating system. This feature is taken into consideration when calculating the heat output of a single-circuit heating boiler, which includes the external water heater for the hot water supply.

What reserve capacity should be at the gas boiler

The heating equipment’s configuration determines how the performance reserve is computed.

  • For single-circuit models, the reserve is about 20%.
  • For two-circuit units, 20%+20%.
  • Boilers with connection to the indirect boiler – in the configuration of the storage tank, the necessary additional capacity reserve is specified.

For spaces up to 300 m2, the designated power reserve is applicable. Larger homes need more accurate thermal calculations.

Calculation of gas demand based on boiler output

The calculation of gas consumption considers the efficiency of the heating equipment, contingent on the boiler’s capacity. The standard models of traditional heating heat generators have an efficiency coefficient of 92%, with a potential increase to 108% in condensing.

In actuality, this means that, under the assumption of 100% heat output, 1 m³ of gas is equivalent to 10 kW of heat energy. Fuel consumption will therefore be 1.12 m³ at an efficiency of 92% and no more than 0.92 m³ at 108%.

The unit’s capacity is taken into consideration when calculating the amount of gas used. Thus, a 40 kW unit will burn 4.48 m³ of fuel in an hour, while a 10 kW heating device will burn 1.12 m³. Complex thermal calculations take into account the dependence of gas consumption on boiler equipment capacity.

Additionally, online calculators that compute heating expenses incorporate the ratio. The average gas consumption for each model produced is often provided by the manufacturer.

It is vital to compute the power consumption of energy-dependent heating boilers in order to fully determine the approximate material costs of heating. Currently, the most cost-effective method of heating is through boiler equipment that runs on main gas.

Calculations are only done for large, heated buildings following an assessment of the structure’s heat loss. In other situations, use online resources or specialized formulas for computations.

Computation of a warm water floor’s power and temperature

How to calculate the capacity of the gas heating boiler – an example of calculation + formulas

What values are used in the calculations?

The simplest calculation of boiler output by area is as follows: 1 kW of output for every 10 square meters of floor area. м. However, it should be taken into account that these norms were compiled back in the Soviet Union. They do not take into account modern construction technologies, besides, they can be untenable in the area, the climate of which is markedly different from the conditions of Moscow and the Moscow region. Such calculations can be suitable for a small building with an insulated attic, low ceilings, excellent thermal insulation, double-glazed windows, etc.п. Alas, only a few buildings meet these requirements. To make a more detailed calculation of the boiler output, you need to take into account a number of factors such as:

  • climatic conditions in the region;
  • Dimensions of the living space;
  • the degree of insulation in the house;
  • the possible heat loss of the building;
  • the amount of heat required to heat the water.

Furthermore, the energy needed to heat the air should be factored into the boiler calculation for homes with forced air ventilation. Usually, calculations require the use of specialized software:

It is necessary to add roughly 20% to the gas boiler’s capacity when calculating for unforeseen circumstances, such as extremely cold weather or low gas pressure in the system.

Is it worth buying a boiler that is too powerful??

The automatic systems found in modern heating equipment enable the regulation of the gas flow rate. This saves a lot of money, which makes it very convenient. It might appear that purchasing a boiler with high power values negates the need to precisely calculate the heating boiler’s power. However, it is not that easy.

Selecting heating equipment wisely will increase its lifespan.

Unreasonably high heat output from the apparatus may result in:

  • Increasing the cost of purchasing the system elements;
  • The boiler"s efficiency can be reduced;
  • failures in the operation of automatic equipment;
  • rapid wear of components;
  • formation of condensate in the chimney, etc. п.

As a result, you should aim to "hit" the precise capacity that fits your home.

Gas boiler for houses of standard configuration

It is not too difficult to calculate the capacity of a gas boiler for a house that is created by a typical project. The ceiling height in these kinds of buildings is limited to three meters. Use the following formula to accomplish this: MK = S*UMK/10.

  • MK is the design boiler power in kW;
  • S – the total area of the room in sq.м;
  • UMK – specific boiler power, which should be for every 10 square meters. м.

The final indicator, which varies based on the climate zone, is:

  • 0,7-0,9 kW for southern regions;
  • 1,0-1,2 kW for the middle zone;
  • 1.2-1.5 kW for Moscow region;
  • 1.5-2.0 for northern regions.

This formula yields the following result for the boiler output calculation for a 200 square foot house in the middle band: 200X1,1/10= 22 kW. It should be noted that this formula only shows how to determine the boiler’s power, which is used to heat the house. The equipment’s capacity must be increased by an additional 25% if it is intended to use a two-circuit system to heat water for household needs.

How to take into account the height of the ceilings in calculations?

Since many private homes are built in accordance with unique projects, the above methods for determining boiler capacity will not work. You must use the following formula to calculate the gas heating boiler fairly accurately: MK = Qt*Kzap. Where:

  • MK – the design capacity of the boiler, kW;
  • Qt – projected heat losses of the building, kW;
  • Kzap – reserve factor, which is 1.15 to 1.2, t. е. 15-20%, by which experts recommend to increase the design output of the boiler.

The building’s anticipated heat losses serve as the primary indicator in this formula. Another formula must be used to determine their value, which is Qt = V*Rt*k/860. Where:

  • V – volume of the room, cube.м.;
  • Pt is the difference between the external and internal temperatures in degrees Celsius;
  • k – dissipation factor, which depends on the thermal insulation of the building.

The kind of building determines the dissipation factor.

  • For buildings without thermal insulation, which are simple structures made of wood or corrugated iron, the dissipation factor is 3.0-4.0.
  • For structures with low thermal insulation, typical for buildings with single brickwork with ordinary windows and roof, the dissipation factor is taken as 2.0-2.9.
  • For houses with an average level of thermal insulation, e.g. buildings with double brickwork, a standard roof and few windows, a dissipation factor of 1.0-1.9 is used.
  • For buildings with high thermal insulation, well-insulated floors, roofs, walls and double-glazed windows, a dissipation factor of 0.6-0.9 is used.

Small buildings with adequate thermal insulation may have relatively small heating equipment design outputs. It is possible that there isn’t a suitable gas boiler available on the market that meets the necessary requirements. Purchasing equipment with a marginally higher capacity than the design capacity is required in this situation. Systems that automatically regulate heating will help to minimize the disparity.

Some manufacturers have considered customer convenience and have included special services that enable you to calculate the required boiler output without difficulty on their websites. In order to accomplish this, input the following data into the calculator program:

  • the temperature to be maintained in the room;
  • average temperature for the coldest week of the year;
  • the need for DHW;
  • presence or absence of forced ventilation;
  • the number of floors in the house;
  • ceiling height;
  • information about the slabs;
  • information about the thickness of exterior walls and the materials from which they are made;
  • information about the length of each wall;
  • information about the number of windows;
  • description of the type of windows: number of chambers, glass thickness, etc.п;
  • dimensions of each window.

The calculated boiler output will be available once all fields have been filled in. The table presents variations of comprehensive calculations of the capacity of various boiler types in an easy-to-read manner.

Some of the variations in this table have already been calculated; you can use them as accurate in advance (click the image to enlarge).

Selecting the appropriate boiler capacity is essential to guaranteeing that your house stays warm and cozy all year long. There are a few things to consider when choosing the right boiler size for a 200 square meter home.

First and foremost, your home’s insulation quality is important. A well-insulated home retains heat more effectively, so you might not require a boiler with as much power. However, a house with inadequate insulation will lose heat more quickly, necessitating a larger boiler to make up for the loss of heat.

Take into account the number of occupants as well as how often they use the hot water. To accommodate everyone’s needs, a larger family with a high hot water demand will require a boiler with a larger capacity. If you’re not sure, it’s always better to go with a slightly larger boiler because it will guarantee that you have adequate heating capacity without taxing the system too much.

Finally, consider upcoming renovations to your house. It’s a good idea to account for any future additions or house expansions when calculating your boiler capacity. By being proactive, you can avoid having to replace your boiler earlier than you had anticipated.

To sum up, choosing the appropriate boiler capacity for a 200-square-meter home requires taking into account the type of insulation, the size of the household, the amount of hot water used, and future plans. You can make sure your home heating system operates as efficiently and comfortably as possible by taking these factors into consideration.

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Ideal heating of a house of 200+ squares

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Sergey Ivanov

I like to help people create comfort and comfort in their homes. I share my experience and knowledge in articles so that you can make the right choice of a heating and insulation system for your home.

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