Which gas boiler to choose for heating a house of 200 square meters

Device

A complete electric heating appliance consists of several important elements:

The electric boiler is the heart of the entire heating system, where the heating medium is heated.
Expansion tank. The heated water is distributed throughout the heating system. The expansion tank is a safety element that absorbs excess water, thereby preventing overloading the system.
The circulation pump provides the entire heating system of the house with a constant circulation of the coolant and the necessary ionization in the boiler body.
The system of pipes with thermoregulation sensors allows you to regulate the operation of the heating system with an electric boiler and save electricity consumption.
Radiators are a necessary element of the system for heating a private house.
Shut-off valves with valves provide a series connection of system elements.
Fuses are used to protect against power surges. When it is turned off, the voltage decreases gradually, which protects the safety of the entire structure.

Features of gas heating

Gas heating is an environmentally friendly option for heating premises, since when gas is burned, it brings the least harm to the environment compared to other types of fuel. Such a system is characterized by the availability and inexpensive cost of equipment, easy and prompt installation, efficiency and simple maintenance.

The only drawback is the increased fire and explosion hazard. Therefore, only professional technicians should install gas equipment! In addition, it is necessary to regularly check the operation of the system by the gas service employees!

To organize gas heating, you need a gas boiler. Today there are many models and types of gas boilers.

It is important to choose the right equipment, because the durability, reliability and safety of the heating system depend on the quality. Let's look at what types of gas boilers exist, and which model is better to choose.

Calculation of liquefied gas

The above formula will work for LPG as well. The only difference is the different thermal conductivity of the gas itself. Therefore, here the parameter q is assumed to be 46 MJ per kilogram or 12.8 kW per kilogram. Let's leave the boiler efficiency equal to 95. Substitute the values into the formula and get:

A = 10 / 12.8 * 0.95 = 0.74 kg / h.

Liquefied gas is always counted in kilograms. Then the value is converted to liters. To do this, the resulting value must be divided by 0.54. In our case, the result is a consumption of 1.37 liters of gas per hour. Further, according to the usual scheme:

The daily consumption of liquefied gas will be 33 liters.
The monthly consumption is almost a thousand liters.

It should be borne in mind that there is only 42 liters in a standard bottle. This balloon is enough for about a day. To understand how many cylinders we need, just divide the amount of gas per season by 42. Further, knowing the cost of a liquefied gas cylinder, you can calculate how much heating the house will cost.

However, it is not necessary to buy cylinders. You can use a gas holder. Gas consumption for heating a house of 200 m2 in this case will not differ. It will be more profitable to simply pump a large volume of gas into the gas tank at once for the whole season than buying a large number of cylinders.

Is it worth buying too powerful a boiler

Modern heating equipment is equipped with automatic systems that allow you to regulate the gas consumption. This is very convenient as it saves you unnecessary costs. It may seem that the exact calculation of the power of the heating boiler is not so important, because you can just buy a boiler with high power ratings. But it’s not that simple.

The correct selection of heating equipment will extend its service life

Unreasonable excess of the thermal power of the equipment can lead to:

increasing the cost of purchasing system elements;
decrease in the efficiency of the boiler;
malfunctions of automatic equipment;
rapid wear of components;
formation of condensation in the chimney, etc.

Thus, you need to try to "get" exactly the power that suits your home.

Should you install a cascade of boilers?

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

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

In the event that one boiler fails, the second heat generator will be able to maintain an acceptable temperature in the house for the duration of the renovation.

Do I need to put in a cascade 2 gas boilers of 20 or 30 kW each? Not. In this case, the whole point of such a scheme is lost, we will simply have 1 reserve boiler "just in case".

Features of using electric boilers in a home heating system

The disadvantages of electric heating are as follows:

boilers do not have sufficient power reserves to heat large private houses;
for uninterrupted operation you need a constant source of electricity;
new wiring is needed to allow the installed electrical equipment to be used at full capacity for heating.

The advantages of using electric boilers are presented by the following list:

a standard electric heating boiler is easy to install and connect to the circuit;
installation does not require permits from utilities;
the presence of a chimney is not a critical requirement;
silent and waste-free operation of the device;
the possibility of connecting parallel circuits (hot water supply system, underfloor heating, etc.).

Determining the type of electric boiler

Heating elements

The classic most common models, in which the well-known heating elements (tubular electric heaters) are used as a heating element. Almost all models are produced in the usual monoblock case, in which, in addition to the flask with heating elements, there is a circulation pump, an expansion tank, a safety valve and an air vent, a set of necessary sensors. Therefore, the installation of the boiler is as simple as possible, it is enough to hang the structure on the wall and connect the supply and return to it.

The device of a standard heating element electric boiler.

The heating elements of electric boilers have the most developed automation, which provides an economical mode of operation of the boiler and allows you to fine-tune its operation. Models of the middle and upper price segments have a smooth degree control. The most effective are models with the ability to connect external control, for example, a room thermostat, which controls the operation of an electric boiler, focusing not on the temperature of the coolant, but on the air temperature in the room, which is more correct and efficient.Room thermostats are often not included, but the cost of the simplest models (which is quite enough) is only about 1000 rubles.

A known disadvantage of heating elements is the formation of a layer of scale on the heating element when using hard unfiltered water as a heat carrier. To heat the coolant through the scale layer, more power and time are required, respectively, the power consumption increases, the efficiency decreases. Already for 2-3 heating seasons, it can fall to 80-85% (from the original 99%).

The way out is to use soft filtered water that does not drain from the heating system every season or to regularly replace the heating element. The rest of the elements in high-quality models rarely fail.

The best heating element models of electric boilers (all with a power of 24 kW):

Photo	Manufacturer and model	Description of features	Cost, rub.
	EVAN EPO-24	The most simple, but reliable heating element electric boiler. It has an extremely compact size, it is controlled using a separate PU (included in the kit). Ideal for a budget price category, but much inferior in functionality to more expensive models (stepwise rather than smooth power control, simple operating modes, there is no possibility to connect additional external control).	16 000-23 000
	RECO 24P	Another model in the budget price category, but in a monoblock case with all the necessary elements of the heating system (circulation pump, expansion tank, a set of valves and sensors). Differs in quite good for its price category automation and functionality of controls. There is a smooth power control, weekly programming, the ability to connect a GSM module. Among the shortcomings - the mediocre quality of domestic assembly and reliability, which, however, is typical for all budget models.	26 000-29 800
	Kospel EKCO.R2-24	Famous Polish model, distinguished by efficiency, build quality, reliability and durability. The heat exchanger is made of more durable and heat-conducting (than steel) copper, insulated with a layer of thermal insulation. Equipped with economical multifunctional automation with smooth power control, energy-saving mode, the set includes a room thermostat. There is also protection against overheating and freezing, suspension of the circulation pump.	39 000-48 000
Read also: Autonomous gas heating of a private house: a complete overview	Bosch Tronic Heat 3500 24 RU	Practically a reference German model of the Czech assembly. One of the best electric boilers for heating a private house with an area of 200 m2, characterized by the highest quality and reliability, stylish design. All components are made of high quality materials, equipped with excellent economical automation with more than 50 adjustable parameters, works with indirect heating boilers and additional circulation pumps. Equipped with protection against overheating and freezing, stopping the circulation pump. There is a possibility of connecting room and outdoor thermostats, organizing a weather-dependent mode.	63 200-70 000

Overview of Kospel electric boilers Best in price-quality ratio

Electrode (ionic type)

A clear principle of operation of an electrode heating boiler.
As a heating element in ionic electric boilers, electrodes located at a certain distance from each other are used. They have a certain polarity and attract water ions. But when AC is applied to them, they change their polarity 50 times per second (at a standard frequency of 50 Hz), which causes the constant movement of water ions and its subsequent heating.

Since this principle of operation does not form scale and the efficiency remains stable throughout the entire operation time, electrode boilers are considered more economical. But this is true only in comparison with budget heating elements models and when using hard water. The automation of electrode boilers is still inferior to the automation of heating elements models costing from 30 thousand rubles or more.

A distinctive feature of electrode boilers is their compact size, they slightly exceed the diameter of the heating system pipe and do not require space around. But all the necessary CO elements, such as an expansion tank, a safety group, and, if necessary, a circulation pump, must be installed separately. High-quality ionic electric boilers are extremely durable, since there is absolutely nothing to break in a simple design.

Is it worth using electrode boilers for heating a private house

The best electrode models of electric boilers (all with a power of 25 kW):

Photo	Manufacturer and model	Description of features	Cost, rub.
	Galan Volcano 25	One of the most budgetary, but reliable domestic electrode boilers. Equipped with a fairly economical, but having limited simple functionality, automation. To increase efficiency, it is advisable to use a specially prepared coolant from the same manufacturer.	8 400-9 500
	Beril-25 Ion	An underestimated model of a Latvian manufacturer. Differs in reliability and multifunctional automatics for such a price segment with smooth power control, economical operating modes, the ability to connect a room thermostat or a GSM module for remote control. Please note that the effectiveness of the automation depends on the version (equipment).	9 600-15 000

Induction

The principle of operation of induction electric boilers.
The principle of heating in electric induction boilers consists in an induction coil, which, when voltage is applied to it, forms a magnetic field. Inside the coil is a core (metal pipe), which, being in a magnetic field, under the influence of Foucault eddy currents heats up to the temperature set by the automation, giving off heat to the coolant flowing through it.

Induction electric boilers are as reliable as possible, require a minimum of attention, they heat the coolant 50-70% faster, but they cost 2 times more expensive than analogues, and such advantages are tangible only in the industrial sphere. In individual systems, their use is justified only if it is necessary to use not standard water as a heat carrier, but antifreeze, oil or glycerin.

Are induction electric boilers justified in the heating system of a private house?

Only one induction model is effective today:

Photo	Manufacturer and model	Description of features	Cost, rub.
	Alternative energy VIN-20	Reliable vortex induction boiler with a power of 20 kW. Despite the low power, the performance is more than enough for a house of 200 m2. Control is carried out using a remote control panel in the form of a cabinet. Power regulation is only 3-stage, no additional external control is supposed to be connected. According to the practice of installation and reviews of the owners, there has not been a single case of breakdown for more than 8 years.	55 000-64 000

What values are used in the calculations

The simplest calculation of the boiler power by area looks like this: you need to take 1 kW of power for every 10 sq. m. However, it is worth considering that these standards were drawn up during the Soviet Union. They do not take into account modern construction technologies, in addition, they may turn out to be untenable in an area whose climate is noticeably different from the conditions of Moscow and the Moscow region. Such calculations may be suitable for a small building with an insulated attic, low ceilings, excellent thermal insulation, double glazed windows, etc. Alas, only a few buildings meet these requirements. To make a more detailed calculation of the boiler power, you need to take into account a number of factors, such as:

climatic conditions in the region;
dimensions of the dwelling;
the degree of insulation of the house;
possible heat loss of the building;
the amount of heat required to heat the water.

In addition, in houses with forced ventilation, the calculation of the boiler for heating must take into account the amount of energy required to heat the air. As a rule, you need to use special software for calculations:

When calculating the capacity of a gas boiler, you should add about 20% more in case of unforeseen situations, such as a severe cold snap or a decrease in gas pressure in the system.

Popular gas units for heating a room of 100 sq. m.

Siberia 11K

The Siberia 11K floor-standing double-circuit gas unit of domestic production is equipped with an open combustion chamber and heat exchangers made of carbon steel. It is capable of operating on both mainline and liquefied fuel. The boiler has the following characteristics:

rated power - 11.6 kW;
heating area - up to 125 sq. m .;
gas consumption - 1.18 m³ / h;
Efficiency = 90%;
DHW at t = 35 ° C - 3.8 l / min.

Find out here how to select the optimal boiler output?

How not to be mistaken in choosing a wall-mounted gas boiler?

Floor-standing gas boilers Siberia - characteristics and model range

https://oteple.com/napolnye-gazovye-kotly-siberia-xarakteristiki-i-modelnyj-ryad/

RGA 11K

The RGA 11K floor-standing double-circuit gas boiler was manufactured in Russia. It is equipped with an atmospheric burner and steel heat exchangers. Works on both mainline and liquefied fuel. The unit has the following characteristics:

rated power - 11.6 kW;
heating area - up to 125 sq. m .;
gas consumption - 1.18 m³ / h;
Efficiency = 90%;
DHW at t = 35 ° C - 3.5 l / min.

Protherm Panther 12KTO

The wall-mounted single-circuit gas boiler Protherm Panther 12KTO made in Slovakia is designed for heating, but it can produce hot water when an indirect heating boiler is connected. Equipped with a closed-type firebox. Works on both mainline and liquefied fuel. Possesses the following characteristics:

…

rated power - 12.1 kW;
heating area - up to 120 sq. m .;
gas consumption - 1.4 m³ / h;
Efficiency = 92%.

Protherm Cheetah 12 MOV

Wall-mounted double-circuit gas unit Protherm Cheetah 12 MOV produced in Slovakia. It is equipped with two heat exchangers and an open combustion chamber. The gas boiler has the following characteristics:

rated power - 12 kW;
heating area - up to 120 sq. m .;
gas consumption - 1.44 m³ / h;
Efficiency = 92%;
DHW at t = 35 ° C - 5.5 l / min.

How to choose the right gas boiler

To choose the right gas boiler, the following criteria are taken into account:

Appointment. The boiler is needed only for heating the room or also for supplying hot water;
Installation method. Floor standing boilers are used for rooms up to 200 square meters and are hung inside the house. Wall-mounted models take up more space and are used to heat spacious cottages. Such products require a separate boiler room;
Manufacturing material. Wall-mounted boilers are made of copper, floor-standing ones are made of steel and cast iron. The latest more durable and reliable materials;
The presence of a chimney. Please note that strict requirements are imposed on the chimney device. If you do not plan to make a full-fledged chimney, it is better to choose models with a closed chamber.

For country houses of permanent residence, experts recommend choosing floor-standing gas boilers. For a small country house, bathhouse or garage - wall-mounted equipment. Next, let's take a closer look at the best brands of wall and floor boilers. An overview will help you choose the equipment that is best for your home.

Floor standing boilers for home 150-200 m2

Floor-standing boilers for autonomous heating of a house are large, powerful and expensive, but irreplaceable for rooms over 150 squares. For example, a Ferroli boiler (70,000 - 150,000 rubles) has a capacity of 24 - 36 kW, which is ideal for heating pulp of 200 m2 with ceilings of 3 meters.

In fact, such a power is even too large, but it is better to choose a boiler with a margin - just in case of an extreme case.

Good characteristics, including the price (from 48,000 rubles) for boilers Alphatherm Beta AT 15. They are made of cast iron and do not have rubber parts. In addition, these boilers are equipped with a piezo ignition function and a circulation pump.

Alphatherm gas boilers are designed for large rooms and therefore have the ability to install an additional indirect heating boiler.

Connecting the electric boiler to the heating system of the circuit

The presence of an electric boiler alone is not enough to keep the house warm. It is also necessary to correctly connect it to the heating system. A properly executed piping scheme will also save on the use of equipment for controlling the temperature of the water in the heating system, preventing it from overheating.In addition, the piping of the electric boiler increases the efficiency of its operation.

The piping of an electric heating boiler has two circuits - small and large. First, the heated coolant passes along a small circuit of the piping, and then it is included in the large one, from where it is distributed over the radiators.

The strapping scheme includes:

circulation pump for pumping chilled water back to the water heater;
pressure gauge - connected to control the pressure in the heating system;
radiators;
pipes of different diameters;
balancing crane;
control valve;
auxiliary elements (adapters, tees; safety, air, reverse type valves; fastening couplings, bolts, nuts).

Of the tools, wrenches and a welding machine are required.

Heating a private house with an electric boiler can be carried out according to 4 main connection schemes:

with natural circulation, which is used as an emergency option in case of a power outage;

with forced circulation - used as the main connection diagram;

using primary-secondary rings. It is used in complex heating systems, including underfloor heating.

For heating multi-storey buildings, a cascade electric boiler connection scheme is used.

Watch a video about electric boilers:

https://youtube.com/watch?v=2M_qMJoszUs

The minimum required power of an electric boiler for heating a house with an area of 200 m2

For an average private house in the middle climatic zone of the Moscow region with 2 brick masonry and a ceiling height of up to 2.7 m - for every 10 m2 of heated area, 1 kW of heat output of heating equipment is required. We also recommend setting 15-25% of the power reserve.

In total, for a private house with an area of 200 sq. m. the minimum required heating capacity is 20 kW * 1.2 = 24 kW.

Simplified calculations are sufficient in more than 95% of cases. If the house is located in the extreme southern or far northern climatic zone, has a large glazing area or high ceilings, it is supposed to install screens on the radiators, accurate calculations are made taking into account the correction factors. You can do this using the calculator below.

Calculator for accurate calculations

When used as the main and only one, the heating capacity of the electric boiler must ensure the total heating capacity of all radiators (it is calculated based on the heat loss of the house). Therefore, use a calculator to find the minimum required values for each room, and then add them up to get the result for the whole house. This will be the individual minimum required power of the electric boiler.