Heating a house with an area of 300 sq.m in Khabarovsk. Boiler 300 square meters

Advantages of an electric boiler over other options

Why not a pellet stove or a coal pot? Why not a diesel or gas boiler from a gas tank? Why, finally, not electric or gas convectors?

Let's figure it out.

A good automatic pellet or coal heat generator with a capacity of 20 kW or more costs from 100,000 rubles in the secondary market.

At the same time, if you wanted to feed underfloor heating from a gas heat generator in the future, then in the case of TT boilers, this preparation will require additional “movements” from you in the form of installing a heat accumulator and an automatic coolant mixing system.

In this case, you will need a container and a chimney. Of course, the chimney can later be used for a gas heat generator with an open combustion chamber.

And if you then put a gas boiler with a closed combustion chamber and a coaxial chimney? Where will you put 8-10 meters of an expensive sandwich?

Thirdly, about the gas tank. Yes, if there will never be gas, then burying a container and heating your home with 200 square meters of LPG is a normal option.

And finally, about convectors. Yes, their installation does not require laying pipes and piping in the boiler room.

But you put the electric boiler into the system, tie it up. And then, when you supply gas, you only have to replace the heat generator. The whole system is ready.

Not to mention the fact that it will be very, very difficult to make a warm floor later - after finishing the fine finishing of the house.

Galmet

A large Polish company for the production of heating appliances, founded in 1982. For many years, the engineers of this company have been busy developing and improving technology for the production of equipment. Currently Galmet is a popular company in Europe and Russia. Equipment deliveries are made to almost three dozen countries of the world. The production process is constantly automated, which helps to eliminate as many human errors as possible and reduce the cost of manufacturing heating equipment.

GT KWuZ 20

Min./Max. Coolant temperature, degrees Celsius	Maximum water pressure in the circuit	Additional functions	Fuel types	Dimensions, mm	Weight, kg	Price, rubles	grade
50/90	2	Pressure gauge.	Wood briquettes, coke, peat, peat briquettes, coal,	1120465960	272	20 490	4

Top 20

Min./Max. Coolant temperature, degrees Celsius	Maximum water pressure in the circuit	Additional functions	Fuel types	Dimensions, mm	Weight, kg	Price, rubles	grade
50/85	2	Overheating protection, underfloor heating connection, pressure gauge.	wood briquettes, coal,	1120465960	272	102 300	5

Wood 20

Min./Max. Coolant temperature, degrees Celsius	Maximum water pressure in the circuit	Additional functions	Fuel types	Dimensions, mm	Weight, kg	Price, rubles	grade
50/85	2	Overheating protection, underfloor heating connection, pressure gauge.	wood briquettes,	1300465985	270	94 700	5

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

Since many private houses are being built according to individual projects, the methods for calculating the boiler power given above will not work. To make a fairly accurate calculation of a gas heating boiler, you must use the formula: MK \u003d Qt * Kzap. where:

MK is the design power of the boiler, kW;
Qt - predicted heat loss of the building, kW;
Kzap - a safety factor that is 1.15 to 1.2, i.e. 15-20%, by which experts recommend increasing the design capacity of the boiler.

The main indicator in this formula is the predicted heat loss of the building. To find out their value, you need to use another formula: Qt \u003d V * Pt * k / 860. where:

V is the volume of the room, cubic meters;
Рt is the difference between external and internal temperatures in degrees Celsius;
k is the dispersion coefficient, which depends on the thermal insulation of the building.

The dispersion coefficient varies depending on the type of building:

For buildings without thermal insulation, which are simple structures made of wood or corrugated iron, the dispersion coefficient is 3.0-4.0.
For structures with low thermal insulation, typical for single-brick buildings with ordinary windows and a roof, the dispersion coefficient is assumed to be 2.0-2.9.
For houses with an average level of thermal insulation, for example, buildings with double brickwork, a standard roof and a small number of windows, a dispersion coefficient of 1.0-1.9 is taken.
For buildings with increased thermal insulation, well-insulated floors, roofs, walls and windows with double-glazed windows, a dispersion coefficient in the range of 0.6-0.9 is used.

For small buildings with good thermal insulation, the design capacity of heating equipment can be quite small. It may happen that there simply is not a suitable gas boiler with the necessary characteristics on the market. In this case, you should purchase equipment whose power will be slightly higher than the calculated one. Automatic heating control systems will help smooth out the difference.

Some manufacturers took care of the convenience of customers and posted special services on their Internet resources that allow you to calculate the required boiler power without any problems. To do this, you need to enter 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 hot water supply;
the presence or absence of forced ventilation;
number of floors in the house;
ceiling height;
overlap information;
information about the thickness of the outer walls and the materials from which they are made;
information about the length of each wall;
information about the number of windows;
description of window type: number of chambers, glass thickness, etc.;
size of each window.

After all the fields are filled in, it will be possible to find out the estimated power of the boiler. Options for detailed calculations of the power of boilers of various types are clearly presented in the table:

Some options have already been calculated in this table, you can use them as pre-correct ones (click on the picture to enlarge)

What electric boiler is needed for an area of 200 m2

As you can see, in this situation, it is an electric heating boiler that will suit you, for a private house of 200 sq m, which will soon have main gas - this is the best option.

What is left for us? Select the power of the boiler.

There is no heat generator with 100 percent efficiency. In this case, we are not talking about heat pumps.

Plus, you should put a reserve on the power of your heat generator for the coldest period in your area.

If you are thinking about having a 200 sq.m. to take a heat generator of greater power, then it’s better to think about this.

The cost of heating with electricity at existing tariffs is high. For your area you will need from 10 to 15 kW per hour of electricity during the heating season and about 5-8 kW in the off-season.

It's per hour. And per day it will be 250-300 kWh in winter and 120-170 kWh in autumn and spring.

What follows is simple arithmetic. Multiply this by your rate. My tariff is now 3.77 rubles per 1 kWh.

Daily heating of a house of 200 m2 with electricity will cost me about 400 rubles in the off-season and 1000 rubles in the winter.

And this, excuse me, is from 12,000 to 30,000 rubles a month. Now look at the duration of the heating period in your area and estimate how much each season you will spend on heating your home at current electricity rates.

What am I leading to? In addition, instead of putting a boiler of greater power, you should think about how to reduce the heat loss of your own home.

Insulate the walls by another 50 mm, install a recovery system, change the windows in the house to energy-saving ones. And you will see that every season you can save even heating such a rather large area with electricity.

What power to choose a gas boiler

Power is the main indicator that characterizes any heating equipment for the home.It is determined by the amount of heat loss of the dwelling and depends on how carefully the room is insulated. Heat losses can vary from 70 to 250 W/sq.m.

No matter how good a gas boiler you buy, if you do not correctly calculate the heat loss, there is a chance that the equipment purchased will not provide sufficient heat.

Please note that a double-circuit gas unit will also be used to heat water.

Of course, the need for hot water can be different - you should take into account the presence of a shower, bath, sink, sink. But the most common are gas boilers to provide the house with hot water and heat with a capacity of 24-28 kilowatts. Such equipment will last about 10 years and will heat a cottage up to 300 m2 in operating mode up to 70% of the declared capacity.

double circuit

Single-circuit and double-circuit gas boilers

Obvious differences:

Single-circuit boilers are suitable when only space heating is required. The boiler is installed separately;
The double-circuit one is able to provide the house with hot water without additional devices, such as a boiler. Of course, such a boiler is more profitable, it is compact and its dimensions are small. A double-circuit gas boiler is often used according to the scheme: First circuit - first floor, second circuit - second floor.

What is more profitable gas or electric boiler?

Undoubtedly, gas boilers are the most popular, because they are the most economical. Usually there are no connection problems: gas pipelines are now widespread. However, pleasure is not cheap, up to 1 million rubles. Do not forget only that it is necessary to calculate the magnitude of the gas pressure.

If you still want to stay on an electric boiler, then consider some points:

To connect it, there must be a three-phase voltage, and it will also require considerable costs for its maintenance. Such a boiler spends 24 kW per hour, when gas - 2.8 cubic meters. But the electric one is compact, it does not require a chimney, it is easy to maintain.
However, electric boilers are certainly the only way out when there is no gas main nearby. For such settlements, of course, it is more profitable to install two-tariff meters and heat the house with an electric boiler from 23.00 to 06.00 in bulk in order to save money.

Wall or floor?

The difference between floor and wall boilers is what material the heat exchanger is made of. Usually, for good wall-mounted gas boiler models, it is copper and the power will be limited to 35 kW, the service life of the device is not very long. Pros: compactness, light weight, the presence of all the necessary components in the case.

Floor boilers have cast-iron heat exchangers, they have unlimited power, they last a very long time.

But they are heavy, take up quite a lot of space, and additional devices such as a pump, a safety group, and an expansion tank must be installed.

Video review:

Do not rush with the choice, consider all the technical nuances. A good gas boiler does not have to be expensive. Do not seek to buy eternal equipment. It is better to change it to the same model after 10 years. Safety, automation, efficiency and, of course, a manufacturer with a name also matter.

Gas, wood, coal, electricity which is cheaper

In the medium term, the cheapest fuel for a boiler is natural gas. To generate 30 kW, only 2.75 cubic meters of such fuel is enough (taking into account 91 percent efficiency and a calorific value of a cubic meter of fuel at the level of 43,000 kJ). In 2015, a thousand cubic meters of gas in the European part of Russia cost about 5,000 rubles. As a result, the “production” of 30 kW using a gas boiler costs no more than 13.75 rubles.

Heating with coal burned in the furnace of a solid fuel boiler will cost a little more. To generate 30 kW, 8 kilograms of coal are needed (taking into account 80% efficiency and the calorific value of a kilogram of fuel at the level of 17,000 kJ). In 2015, a ton of ordinary hard coal cost about 4,000 rubles.Generation of 30 kW using a coal-fired boiler will cost 32 rubles. But coal will have to be stored somewhere. Yes, and the delivery of such fuel is not cheap.

Heating a house with wood only will cost a lot more. If dry wood with a calorific value of a kilogram of fuel at the level of 14,000 kJ is loaded into a solid fuel boiler, then almost 10 kilograms of firewood will have to be spent to generate 30 kW, taking into account the 80 percent efficiency of the boiler. In 2015, the cost of a cube of firewood (650 kilograms) with home delivery in the form of a packed woodpile reached 3,000 rubles. As a result, the generation of 30 kW using a wood-burning boiler will cost 46-47 rubles.

Electric boiler for a house of 200 sq.m. - this is a direct path to ruin, even taking into account the 99 percent efficiency of such a heater. After all, the cost of a kilowatt with electric heating reaches 2.4 rubles. As a result, the generation of 30 kW will cost 73 rubles!

Popular models of gas boilers for a house of 200 sq. m.

Double-circuit gas boiler for a house of 200 sq.m. compatible with programmable thermostats. This heater is equipped with a 10-liter hydraulic accumulator, a three-way valve and its own pressure unit - a three-speed pump.

Other characteristics of the model:

Turbocharged gas boiler with a heat exchanger for heating hot water. In the case of this model, there was a place for a pump, an expansion tank, and even a bypass. The burner and heat exchangers of the boiler are made of stainless steel.

Wall-mounted chimney gas boiler, equipped with a hot water circuit and a 60 liter boiler. The pressure unit of this boiler consists of two units - one pump serves the heating system, the second - the hot water supply system.

Other characteristics of the boiler:

Solid fuel boilers for a house of 200 "squares" - an overview of popular models

Single-circuit solid fuel boiler for a house of 200 sq.m. with the possibility of connecting a heat accumulator and an indirect DHW heating circuit. The boiler uses the energy of wood and coal. Moreover, a full load of firewood burns for at least 2 hours, and coal will last twice as long - up to 4 hours.

Thermal power - 32 kW on coal or 29 kW on wood.
The capacity of the heat accumulator is up to 1350 liters.
Management - mechanical (adjustment of traction using the throttle).
The cost is up to 60 thousand rubles.

Pellet boiler for a house of 200 sq.m. with the ability to connect to a hot water system. In addition, this heater is equipped with a hopper with automatic supply of granulated wood (pellets) or fine coal. The capacity of the bunker is enough for 3 days of work.