How to choose a gas boiler for home

Gas equipment is by far the most economical. Not only the type of fuel can reduce costs, but also the right choice of boiler. In order not to get confused in a wide range, you need to study the parameters and characteristics of the models. A properly selected boiler will consume less energy and work many times more efficiently.

How to choose a gas boiler for a private house

The selection of equipment is carried out according to the parameters and functionality. Consider the main selection criteria:

  • The rated power of the boiler should be selected based on the type of heating system. It should be enough for high-quality heating of the home.
  • The choice of dimensions and material of the body, performance depends on the place.
  • Installation type – wall or floor. For a private house and a large room, a floor-standing appliance is suitable. Hanging placement is chosen for an apartment or small rooms.
  • View of the combustion chamber. If the house has a chimney, you can buy models with an open chamber. In products of a closed type, combustion products are forced out.

What are the boilers according to the principle of operation? Single-circuit – provide hot water supply (DHW). Double-circuit – work for heating and hot water.

  • The dependence of the device on electricity. This is important to consider if there are frequent power outages in your area.
  • Availability of automation, security systems.
  • Brand, manufacturer, cost.

Thermal power

Without this criterion, it is impossible to make the right choice. You should calculate what area the boiler will heat and what nominal load it will withstand.

The instructions for each model indicate the power of the product and the area for which it is designed. You can find the following calculation recommendations: for every 10 m², 1 kW of energy is required. But all these indications are approximate. It is important to consider the following factors:

  • dimensions of a particular room;
  • ceiling height;
  • thickness and material of walls, ceilings;
  • number and size of windows;
  • the appointment of neighboring rooms (for example: there is a cold attic or a heated room nearby);
  • the presence of additional heating;
  • the presence of doors with access to the street.

Given all the parameters of the room, you can correctly and accurately choose a gas boiler. The house plan and the formula will help in the calculations:

Important! These calculations help and the number of sections for each room.

Installation method

If the load is not more than 30 kW, choose a wall heater. It is compact and can be installed in any non-residential premises. This is a flow device that requires an additional connection to electricity. On the one hand, wall-mounted devices have great functionality, on the other hand, heating will stop when the electricity is turned off.

The floor version can be installed at a power of 70 kW. Such a device will fit in the kitchen or in the hallway. But equipment for 150 kW or more needs a separate room and a reinforced base. The product is quite noisy, has a lot of weight, so many owners are completing a separate boiler room.

For the private sector, a mechanically controlled floor unit is more suitable – an easy-to-use and reliable device.

Type of burner, combustion chamber

A good heating device must efficiently remove combustion products. There are two types of models:

  • With open chamber and atmospheric burner. The flame is supported by natural ventilation in the room. To remove smoke, the device is connected to the chimney. Unlike private houses, the presence of a chimney is rare in apartments.
  • With closed chamber and turbocharged burner. Combustion air is forcibly forced. For this, a fan is installed inside the boiler. The exhaust gases are produced through a coaxial chimney. It has a special “pipe-in-pipe” design: gases exit one by one, clean air is taken in the other.

The second option is more expensive, moreover, it is volatile. But if it is not possible to connect to a separate chimney, a turbocharged boiler is an excellent way out.

Number of circuits

If you only need water heating for household needs, a single-circuit will do.

Double-circuit devices are designed for heating water for heating and hot water. Most models are equipped with two heat exchangers, and the liquid in them is heated in a flow way. This method is not economical. The way out will be a device with a built-in storage boiler. In some cases, the boiler is taken out separately and connected to the system.

Comparative characteristics of floor and wall boilers

Let’s start with features outdoor equipment.

Heat exchanger material

The most durable are cast iron installations. They are not subject to corrosion, the strong structure does not burn through. On the other hand, cast iron is a brittle material, it is afraid of mechanical stress, temperature changes. Equipment with a cast iron radiator is very heavy.

In expensive products, a special alloy is added to cast iron, which eliminates these disadvantages.

More popular steel heat exchanger. Its price is lower, it is more plastic, not afraid of temperature changes; at the same time prone to condensation and corrosion.

Radiators made of stainless steel or alloy steel are not afraid of corrosion. Some manufacturers cover parts with protective enamel.

work Features

The floor unit is of a pressurized type, a turbocharged burner is installed in it. These models have high power (from 100 kW) and high efficiency. Their feature is versatility. You can use the burner or turn it off and use another type of fuel (diesel).

Despite the emergence of new economical boilers, many users prefer non-volatile equipment. It uses a thermocouple to actuate the gas valve. It can be included in a natural or forced heating system.

Water heating

Providing hot water to the house is carried out in several ways:

  • Connecting an indirect heating boiler. At the same time, you will be fully provided with a supply of hot water. The disadvantage of the installation is the high cost of the boiler.
  • Installing a heater with built-in storage. It is convenient to use a single design, but its cost is not low.
  • Connection of a separate boiler with a copper heat exchanger.

Let’s move on to wall technology.

It is possible to place a compact unit in any non-residential premises (most often it is a kitchen). The device is constantly under supervision, you can adjust the temperature at any time.

It is unlikely that anyone would want to install two separate boilers for heating and water supply. Therefore, users choose dual-circuit models. Simultaneous operation of both circuits is not possible: the built-in three-way valve switches the heating from DHW to heating and vice versa.

Important! Heating is carried out according to the flow principle. Therefore, the parameters indicated in the documents do not mean that water will flow from the tap at exactly this temperature.

Why is this happening? It all depends on the temperature of the fluid at the inlet to the system. If it is 10 degrees, and the heating is 35 degrees, as a result, we will get water heated to 45 degrees. Yes, in the winteriodine requires a higher temperature than in summer.

Types of heat exchanger

The design of a single bithermal radiator It is a “pipe in a pipe”: one coolant circulates for heating, the other for hot water. The diagram shows the principle of operation of the product:

The disadvantages of such a radiator:

  • The supply of heat carrier is carried out alternately. If the heating is on, the DHW water is in the circuit and at the same time heats up. As a result, scale builds up, which is very difficult to remove in a bitermal product. It is recommended to install water filters.
  • There may be leaks between the tubes. In this case, only the replacement of the node will help.
  • The big problem is overheating. The temperature for heating is required higher than for DHW, but it heats up water for them at the same time, when you open the mixer, you can scald your hands. PoeTherefore, manufacturers have limited the heating of water to 70 degrees, and this is not always enough to heat the room.

The primary radiator has the form of a coil and is located above the burner. The coolant heated by it is designed for space heating.

The secondary heat exchanger is located at the bottom and is a plate structure. It is used only for hot water supply (DHW). Heating occurs separately for each node. So you control the temperature yourself.

Management and security

To use the equipment was convenient, pay attention to the management. Some burners have a modulating system, with which you can smoothly adjust the power of the flame. Two-stage control will help you select two modes, one-stage is equipped with only “On” and “Off” buttons.

A high-quality boiler is equipped with protection sensors:

  • pressure control;
  • the presence of a flame in the burner;
  • overheating;
  • the presence of traction;
  • removal of combustion products;
  • safety valve.

Manufacturers, models

Good reviews and love from users received such brands:

  • Get out;
  • “Proterm”;
  • Buderus;
  • Navien;
  • “AOGV”;
  • “Conord”;
  • Valiant.

Among the wall appliances are the following models:

Bosch Gas 6000W WBH 6000-24C

A new development from the well-known brand “Bosch” is specially designed for operation in Russian conditions. The double-circuit product works stably at pressure drops in the network from 10,5 to 16 mbar. The power is 24 kW, and the productivity is 6,8-11,4 l / min, depending on the heating temperature.

The design includes a pump, expansion tank, copper primary heat exchanger. Ignition occurs automatically, the connection to the network is single-phase. The flame in the burner is modulated, the display shows the settings. The protection system includes:

  • gas control;
  • overheating sensor;
  • “Antifreeze” mode;
  • pressure relief valve.

Closed combustion chamber. Dimensions 400x700x299 mm.

The price is from 29 rubles.

VaiecoTec plus rim VUW INT IV 246

Condensing device made in Germany. For heating, the additional heat of condensate is used, so the operation of the equipment is very efficient. VUW INT IV 246 can withstand a load of up to 20,4 kW, and the productivity is 11,5 l / min. Works with conventional and liquefied gas.

Features:

  • Thanks to the Aqua-Power-Plus mode, the heating output is increased to 24 kW.
  • Installation for systems with low temperatures is possible.
  • The closed chamber type ensures safe operation.
  • Steel condensing radiator.
  • Built-in expansion tank of 10 liters.

Electronic control, automatic ignition. The flame is controlled by the air supply. The burner automatically mixes the fuel with air, which maintains the stable operation of the device.

Case dimensions 440x720x338 mm.

The cost is from 74 rubles.

Floor options no less popular. The rating of the best includes models of domestic production.

AOGV-23.2-3 Comfort N

The product of the Zhukovsky plant is environmentally friendly: at the outlet, the exhaust gas is cleaned better than other devices. Imported automation from Honeywell was installed. Maximum heat load 23,26 kW. The equipment is non-volatile.

The burner in this unit is atmospheric, so a separate chimney is required. The tank is made in a reliable seamless way. Installation in systems with compulsory and natural circulation is possible. Ignition is carried out by pressing a piezoelectric element. Has a simple mechanical control.

The security system includes a temperature sensor and gas control. Dimensions 420x1050x480 mm.

The price is from 25 rubles.

Baxi SLIM 2300 Fi

Outdoor equipment in an elegant Italian design. The stylish case (650x850x600 mm) will perfectly fit into the interior. Power reaches 29,7 kW. A safe closed combustion chamber, dual-circuit design and a built-in 50 liter boiler are all you need for comfort.

The maximum hot water output is 17 l/min. The temperature is controlled in two directions. Can be connected to the “warm floor” system. The ignition is electronic, the burner is made of stainless steel. There is a possibility of remote control.

Security elements:

  • self-diagnosis system;
  • thermostat;
  • pump blocking protection;
  • “Antifreeze” mode;
  • flame sensor.

The cost is from 110 rubles.

Considering our recommendations, you will buy high-quality and easy-to-use equipment. A boiler suitable for your home will last a long time, efficiently heating your home.

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