Which boiler is better for a private house of 200 m2: how to choose, the best models, prices, comparison

If you want to know which gas boiler is best for a private house of 200 sq. m., then “you are welcome to our hut” - we will examine this question below.

In particular, we will consider what power of the heating unit we need to include in the calculations, whether it is necessary to reserve power for the production of hot water in the domestic hot water supply, and whether it is worth using a cascade scheme for installing heat generators with such a house area.

How to choose a fuel type? Is gas, electricity, solid or liquid fuel better?

House with an area of 200 sq.m. has no significant limitations on area, which gives owners greater freedom in choosing a boiler based on the type of fuel used. In such a cottage, you can equip a separate boiler room and find a place for a floor-standing boiler and a fuel supply for it, or give preference to compact wall-mounted gas or electric models.

Gas.
It is a very common type of fuel due to its low heating costs compared to other options. Gasification has already been carried out in most regions of Russia, so a gas boiler for a 200 m2 house can be installed there without problems. Even if there is no main gas, many boilers can be converted to use liquefied gas. Gas boilers are produced by all well-known manufacturers (Vaillant, Protherm, Bosch, Baxi and others). Among the most popular series are the Bear, Panther, turboTEC, Luna-3, etc. boilers. When purchasing a gas boiler, you can count on an average efficiency of about 89-92%. Finding specialists in the installation and repair of gas boilers is not a problem, since this type of heating equipment is well known to specialists.
Electricity.
An environmentally friendly, but expensive type of fuel for boilers for a house of 200 sq.m. Due to high heating costs, few owners prefer this option, but the convenience of electric boilers cannot be denied. They are lightweight, ultra-compact, silent, equipped with advanced automation, easy to install and operate. Another big plus is high efficiency (up to 99.5%). Boilers from the Vaillant eloBLOCK or Protherm Skat series are popular.
Solid fuel.
Solid fuel boilers for a house with an area of 200 square meters are effective, but not very common. This group accounts for no more than 15% of all heating boilers installed in Russian houses and cottages. The reasons are simple: not everyone is comfortable storing a supply of firewood, coal or pellets. In addition, solid fuel boilers emit quite a lot of combustion products into the atmosphere and require frequent maintenance (cleaning from soot). However, this type of heating is indispensable in areas without gasification. Efficiency rates are usually in the range of 80-90%.
Liquid fuel (fuel oil, kerosene, diesel).
They are not often used due to the need to allocate a room for a boiler room and a sufficiently large container for storing fuel. Suitable for non-gasified residential areas. They show efficiency comparable to gas boilers.

Reserve for heating tap water

If you want to use your gas boiler for hot water supply, then you should decide how exactly you will prepare hot water for the water supply. This determines what reserve for hot water supply you will need to include in your calculations.

If you use a double-circuit boiler, then to reliably heat tap water in instantaneous heater mode, you need to set at least 30 percent of the power.

That is, for our case this is a minimum of 6 kW, and the total power is at least 26 kW. And that is not all.

If you use two water points in the bathrooms, one point in the kitchen, a bath, a shower, and also heat water for the bath with a boiler, then you will have to spend not 30, but 50 percent on hot water.

That is, at the output we already have 10 kW for DHW or 30 kW of total power.

However, if you decide to use a single-circuit boiler and an indirect heating boiler, then you should set the minimum power for hot water supply in the region of 2-3 kW.

Of course, if you install a standard 100 liter 24 kW boiler, then for quick heating it can take on all 20 kW.

But in the case of using only 3 kW of reserve, it will also heat the water. Only it will take about 4 times longer to do this.

Although, with a reserve of 3 kW, water in the BKN of 100 liters is heated to +55 degrees Celsius in just 40-50 minutes.

Power calculation for a boiler for a house with an area of 200 square meters

Having chosen the type of fuel, you need to calculate the required power.

In regions of Russia with a temperate climate (no severe, prolonged cold in winter), you can use a thermal conductivity indicator of 1 kW of power per 10 m2 of area.

Simply multiplying the coefficient by the area will not work, since you also need to take into account the efficiency of the selected boiler, the degree of insulation of the house, the percentage of glazing, the number of doors and many other indicators. Therefore, when purchasing a boiler, a power reserve of 10-30% is included.

Based on this, for a house with an area of 200 sq.m. A 21-24 kW boiler is suitable.

Excess power (for example, 30 kW or more) is not the best option if the boiler will be used only for heating. When operating at less than full capacity, boilers' efficiency is significantly reduced.

Why count if you can buy a boiler with a power reserve?

Sometimes boilers have a capacity reserve. This is good when the reserve is no more than 25%. Especially when the family plans to develop the area: complete a swimming pool, sauna, or other heated area. When the required power is exceeded significantly, the owner spends extra money, and the equipment operates in abnormal mode:

Conclusion: frequent switching on and off wastes more fuel than continuous operation. Buying a boiler with excess power not only makes no sense, but is also harmful to the budget and equipment.

Which boiler is better for a house of 200 sq.m.: wall-mounted or floor-mounted?

In a house or cottage with an area of 200 square meters, you can easily find a place for a standard floor heating boiler. Such models have no restrictions on the type of fuel; they are extremely diverse. For example, it is possible to buy a cast iron heating boiler, which can only be installed on the floor due to its heavy weight. Cast iron heat exchangers are the most durable and stable due to their high corrosion resistance.

A wall-mounted heating boiler will also be an excellent choice for a private house of 200 m2. This equipment has compact dimensions and less weight compared to floor-standing units. Many wall-mounted models have more advanced automation and many “smart” functions.

Why contact a specialist?

We found out that buying a boiler from the square is wrong. It is important to consider the heat loss of the building. For example, a house of 300 m² can be heated by a 15 kW boiler if all surfaces are thoroughly insulated. And a house of 150 m² may require 30 kW equipment with thin walls and uninsulated roof and ventilation.

There are hundreds of standards and regulations on this topic, there are dozens of formulas. Sometimes one thing contradicts the other, or standards change and it is difficult for a non-professional to understand whether these requirements are relevant. You can calculate all this armed with a stack of reference books. Or contact specialists who will make accurate calculations in the program and explain all the details. They will help you save money, time, and model an efficient home heating system.

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Single-circuit or double-circuit?

If the boiler has only one circuit, then it by itself can only provide heating to the house. If you need to heat water for a house with an area of 200 square meters, you will need to buy and connect a storage boiler. This usually requires a connection kit recommended by the manufacturer.

Double-circuit boilers are initially designed for heating and hot water. However, it is recommended to use such equipment only when the need for hot water is small, otherwise the supply may be unstable or completely insufficient.

How to solve the problem of high power and weak demand?

In an ideal situation, the boiler operates at a constant, rated output. At the same time, the outside temperature is constantly changing, and there are even abnormal jumps. What to do? Four-way mixing valves in the hydraulic system will help. Or an option with thermo-hydraulic distribution. These devices solve the problem not by adjusting the boiler power, but by adjusting the control valve. Or the speed of the circulation pump changes. The temperature of the coolant in the batteries becomes comfortable without disturbing the optimal conditions of the boiler. This solution has a minus - a high price.

Four way mixing valve

For gas and liquid fuel boilers, multi-stage burners solve this situation. A lower stage reduces the boiler power if necessary. Advanced models have a smooth adjustment of burner power - modulation. It is cheaper and not as troublesome as the first option.

Multi-stage gas burner

Solid fuel boilers also have built-in power settings and automatic fuel supply. This helps solve the issue of excess power when the external temperature changes.

Automatic fuel supply device for liquid-heat boiler

Is an open or closed chamber better for a gas boiler?

Atmospheric traditional boilers with an open chamber take air for combustion of gas fuel directly from the room, so they require good ventilation. The combustion products are removed through a classic vertical chimney. These are boilers of simple design, easy to repair and maintain.

A closed combustion chamber is a more modern and technologically advanced option. Such boilers for a 200 m2 cottage use a coaxial (lateral, passing through the wall) chimney to take in air from the street and exhaust smoke. Boilers with a closed chamber have a built-in fan. They are considered the safest to operate, but their cost is higher than that of atmospheric models.

Should we install a cascade of boilers?

Or maybe install a cascade of two gas boilers? What advantages does this scheme have in our case? For example, you can put 2 gas boilers in a cascade, each with a power of 15 kW.

It will be possible to use 1 boiler in a cascade in the off-season, and in winter connect both boilers.

If one boiler fails, the second heat generator will be able to maintain an acceptable temperature in the house during repairs.

Is it necessary to put 2 gas boilers of 20 or 30 kW in a cascade? No. In this case, the whole point of such a scheme is lost; we will simply have 1 backup boiler “just in case.”

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The best boiler models for a house with an area of 200-240 square meters

In the Teplo-Comfort online store you can buy several boilers with suitable parameters. Below we will talk about the most popular models. This is a wall-mounted equipment with a power of 21-24 kW, running on gas, electricity and solid fuel.

Gas wall-mounted boiler Protherm Cheetah 23 MTV and MOV

23 MTV 23 MOV

Power: 23 kW

A modern double-circuit heating unit for heating and domestic hot water with smooth power control in a laconic white body. The MTV model with a closed combustion chamber is equipped with a coaxial flue gas system, while the MOV has an open chamber and is connected to a standard vertical chimney. The boilers have an informative LCD display to simplify setup and operation of the equipment, high efficiency of 93.2%, a built-in expansion tank and a plate heat exchanger. Automatic microprocessor load control of the heating and hot water circuit, multi-level protection system, several operating modes, including ECO for economical heating of hot water.

Price: 58698-61640 rubles