Boilers solid fuel combined firewood electricity. We choose a combined boiler for solid fuel and electricity. What is the best way to switch to combined heating?

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Each owner country house wants to heat their area as cheaply and efficiently as possible. Can be used different variants solution to the problem, but a combined boiler: electric and wood-burning - this is the best answer to the heating problem. Resource consumption is lower than gas installations, so that the price of autonomy will not be shocking.

Combined heating boilers: wood-electricity - what is it?

This device is able to provide a country house with heat for a long time and reliably. Of course, the name speaks for itself: this boiler works simultaneously on two types of resources - wood and electricity, which are perfectly combined with each other and save a large number of funds for fuel (read also: "").

Distinctive feature similar boilers before the standard solid fuel model is the presence of a tubular electric heater installed in the heat exchanger tank (more: ""). In addition, these wood-burning electric heating boilers have automatic system control of the power of the generated heat, so that the device can switch to a more economical mode at any time.

Additional equipment for the heating system

A combined gas firewood electricity boiler can come with special meters and performance control systems that significantly increase the flow of heat into the house (read also: ""). Such sensors can independently turn on the heating mode not with wood, but with electricity, which allows you not to worry about an unexpected cold snap in your home.

In addition, these devices do an excellent job of warming up the territory and in relatively warm weather, when high power not required. They drive water through pipes, maintaining a predetermined minimum temperature. Thus, the electric is useful in any weather. If the owners of the property are not at home, and you don’t want to spend a decent amount on heating, then the device can be put into saving mode, which will maintain a temperature sufficient to keep the water in the pipes from freezing.

Features of the structure of a universal boiler

Each such system has a simple, but verified design of the apparatus. As a rule, firewood gas has a firebox at the bottom of the appliance.

Solid fuel is added there, for example:

Firewood (read: "");
Coal;
Peat.

During the operation of the boiler, heat is generated, which heats the liquid in the heat exchanger. This heated water is sent through pipes throughout the house.

In the case of switching fuel from wood to electricity, the main element of the system will be tubular. In addition, in the energy saving mode, the wood combi boiler also switches electricity to current.

Installation and rules for using the device

Since the device works on several types of resources at once, you should be especially careful when using it. In addition, the installation of the boiler must be carried out as much as possible in accordance with the instructions in order to avoid further problems during use.

It is worth starting work with planning the placement of the system. A separate room will be required, since it is better to place combined heating with electric firewood isolated from other housing elements. The boiler itself should be placed on a concrete pad, in addition, it will be necessary to think over and install a chimney and a ventilation system.

If you do not want to deal with the installation of the heating system, then it is better to turn to professionals who will not only quickly bring the matter to the final stage, but will also issue a guarantee for the work done.

The principle of the device of a combined boiler in a private house, details on the video:

Combined boilers firewood electricity: the main advantages

This heating system has whole line advantages over standard gas heaters or wood-burning boilers, such as:

Fuel is cheaper than that of analogues using only one type of kindling. Since not only electricity is consumed, but also wood, it is possible to throw any waste from sawmills into the boiler, which are sold for ridiculous amounts.
The combi boiler is very versatile, as it can switch from wood to wood at any time. electricity. This is especially important, since there are situations when logs are not at hand, and it is necessary to maintain the temperature in the house (read also: "").
This is very economical, as wood and electricity are now the cheapest in the fuel services market. Every year gas becomes more and more expensive, so switching to combined heating will be very profitable.
Universal boilers for heating wood electricity do not have a harmful effect on the environment, as they do not emit emissions into the atmosphere. Thus, it is one of the most environmentally friendly heating systems, safe for allergy sufferers and asthmatics.
The automaticity of the system allows you not to worry about the safety of heat in the house or overspending on fuel even in the absence of property owners.
Electricity and wood emit a large amount of heat, so that the room warms up very quickly and efficiently. A well-thought-out system of the device allows you to avoid heat losses, which also allows you to seriously save on fuel.
Combined boilers have long term work, so that by purchasing such a unit, you can forget about the modernization of the heating system for a long time.
The boiler has pleasant external characteristics, so that even putting up a house for sale and taking a photo of a room with a heating system, the seller will only receive advantages from the presence of this system.
Such boilers do not produce dangerous leaks, as is the case with gas counterparts, so you can worry less about the safety of your home.

Currently, such combined systems are gaining popularity due to the cheapness of fuel and the ability to vary the heating mode. They provide excellent performance, heating the home in the shortest possible time without eating up a fortune. In addition, this development will last for many years, so a combined wood and electricity boiler is the choice of those who prefer reliability and practicality.

The large-scale construction of suburban real estate has led to the rapid development of the heating systems market. Owners of private and country houses more and more preferred modern systems autonomous heating, refusing gas water heaters. Often this is due to the high cost of natural resources or the inability to connect gas to the house. Universal combined boilers are gradually replacing gas units.

Combined boilers are designs that are able to work on various types fuel. Versatility of these units lies also in the fact that they can be used absolutely in any area, they do not require special conditions. Plus, combined boilers can be used without worrying about a weak gas supply or electricity fluctuations. In case of problems, you can easily switch to another fuel source. Combined equipment can operate on diesel and solid fuels, gas and electricity.

The device of combined boilers

Types of combined boilers

Depending on the combination of fuel types, Various types combined boilers:

diesel fuel and natural gas;
diesel, natural gas and solid fuels (usually wood is used);
diesel, natural gas and electricity;
diesel, solid fuel, gas and electricity.

Combined boilers for diesel and natural gas are less common than others. This is a rather unusual combination of the most expensive and cheapest fuel. But this model of the combined unit is very technically efficient.

Boilers operating on gas, diesel and solid fuels, last years are gaining more and more popularity. It has become unfashionable to use boilers only on wood, however, boilers with a combination of different types of fuel continue to be produced. In addition, it is not at all necessary to use firewood, they can be replaced peat or wood briquettes, coal or coke.

Gas-firewood boilers are no less popular, however, these models have the most low level control security and automation, accordingly require more attention and concentration of the owner. In this regard, such boilers have the lowest cost.

Combined gas-solid fuel-electricity boilers. Very common in private and country houses. The only and most important drawback of such boilers is inability to fully heat the entire house. This device can only maintain the optimum temperature level in the system.

A boiler using electricity, gas, diesel and solid fuels is a universal device for heating and water supply residential premises. The use of such boilers minimizes heating costs, and also reduces the risks of operation.

A variation of this model is a combined boiler that runs on electricity and solid fuel (wood).

Combined wood-electricity boiler

The design of this unit is well thought out and practical designed. In order to warm the house in a short time, you can use wood or wood waste. Electric mode operation is switched on only to maintain the optimum level of temperature in the room. This is very convenient, especially at night, when it is almost impossible to constantly monitor the firebox.

Unlike traditional solid fuel boilers, an additional heating element is installed in the heat exchanger tank. In addition, this combi boiler model has a built-in automation system, allowing to change the power and operating modes of the boiler. Also in such models automatic switching between types of fuel is provided, which provides maximum unit safety. It can be concluded that this model of boilers is the most efficient and has a number of advantages over other types of combined boilers.

pros

Low cost of the unit;
Versatility;
Availability;
Availability of an automation system;
High quality heating.

Principle of operation

This model works almost the same as a conventional solid fuel boiler. Firewood is loaded into the furnace, which is located below, and the heat that is released during the combustion of wood is heated by a heat exchanger with water that enters the heating system. Additional heater maintains the required temperature preventing freezing of the coolant. After burning firewood, it turns on automatically.

What to Look for When Buying an Electric Wood Boiler

A combined boiler that runs on wood and electricity is worth buying, given the main parameters:

power;
the presence of a coil for hot water- second circuit;
grate material for sifting ash, when using firewood, it is better to give preference cast iron grates, they are the most heat-resistant, ceramic grates are suitable for bulk materials - straw or wood chips;
unit weight - some models can weigh more than a dozen kilograms, so additional floor reinforcement may be required before installation;
furnace size;
valve for silent operation of the boiler;
heat exchanger material, it can be steel or cast iron the latter are heavier in weight and can crack from temperature extremes, but, unlike steel ones, they will save them from corrosion.

The use of combined heating systems will ensure reliability, high performance and heating efficiency of your home.

During the heating period, comfortable living in country house It is impossible to imagine without high-quality heating of housing. And therefore, for owners of private houses located far from cities and regional centers, the issue of acquiring a high-quality autonomous boiler is becoming increasingly relevant.

In the absence of gas supply and the impracticality of stretching the gas network to the house, for example, if the gas main is removed or it does not exist in the region at all, many owners of private households use alternative sources heat, for example, using solid fuel or electricity.

Advantages of combined boilers

The use of firewood and electricity separately has many disadvantages, which practically disappear if a combined wood-electricity boiler is used to heat the house.

Advantages of heating boilers on wood and electricity are:

use in any region of the country, without being tied to a gas pipeline, because access to firewood and electricity is practically unlimited;
there is no dependence on the supply of electricity, because, when the light is turned off as a result of a broken wire or for any other reason, you can always switch to alternative way heating;
the use of firewood will save on electricity, since their price in many regions is lower than the cost of electricity;
the opportunity for the owner to decide on the beginning or end of the heating season;
there is no need to constantly monitor the presence of firewood in the furnace;
built-in automation that allows you to set the required temperature and heating power;
affordable price.

Thanks to the automatic burner switching system, the owner of the house is not tied to the place and can leave the house for a while without worrying that heating system unfreeze. Indeed, if the solid fuel burns out, and there is no new supply, when the temperature in the heat exchanger drops, the automation is triggered, switching the operation of the device from wood to electric heating mode. And the boiler starts to work only on electricity until solid fuel enters the furnace. Therefore, freezing of the heating system is completely excluded by maintaining minimum temperature heat exchanger.

Firewood boiler device - electricity

Combined boiler has quite simple design and consists of:

furnaces for loading solid fuel;
chambers for ash, through which air circulates, which is necessary for the combustion process;
a heat exchanger in which water is heated;
grate.

Unlike simple boilers that operate only on solid fuels, an electric heating element is built into the heat exchanger of the combined boiler, which maintains the required temperature. The main type of fuel is firewood. They are loaded into a specially provided furnace, heating the coolant, the heat from which goes to the heating system. Boiler start it is recommended to start with firewood, and only after the heat exchanger has warmed up, transfer to mains operation. This will reduce energy consumption and heat the room in a short time.

Management of solid fuel and electrical system carried out separately. The heating elements are controlled by an electric unit, and the thermostat, by changing the opening angle of the ash chamber damper, supplies air into it, which maintains the required burning force of solid fuel.

Pipes are connected to the device from two sides, at the inlet with cold, at the outlet - with hot water, which, in turn, goes to radiators or underfloor heating.

Mixed boiler selection

When choosing a combi boiler for heating, pay attention to the following points:

Installation Requirements

When installing a combined boiler, a prerequisite is the presence of a chimney, as for a unit with solid fuel. For the perfect operation of the device, one of the main rules for installing a chimney is good draft; for this, the height of the required pipe head must be at least 0.5 m.

Combined boilers are produced only in floor version and should be installed in a separate well-ventilated room - the boiler room. Main requirements for the room and chimney:

It must be remembered that without permits it is impossible to install a combined boiler. After all, it requires a dedicated power line, designed for 380 volts. The unit is connected strictly according to the instructions, because the slightest deviation from its points can cause the device to malfunction.. For safe operation of the boiler, it must be grounded. In addition, strict adherence to fire safety, for this:

in the boiler room around the appliance there should not be combustible or easily flammable materials;
in front of the furnace must be laid a metal sheet, this will help prevent fire when burning fuel or a spark falls out of the furnace.

A properly installed, working electric wood-fired heating boiler does not harm environment. But with all the advantages of a mixed boiler, it has there are some disadvantages:

high cost of electricity;
the need to harvest firewood for the heating period and store them in a separate room.

Using a combined boiler for heating will help create comfortable warmth and comfort in the house. And in the absence of centralized gas supply, is the best choice.

All in our time, you can increasingly see universal combined for a private house heating boilers operating simultaneously on two types of fuel. Combining firewood and electricity together is a pretty smart solution, such a boiler is quite reliable, compact and practical. And if there is a power outage or a lack of fuel, you will not experience discomfort from the cold or lack of hot water during the cold period.

Modern heating boilers use solid fuel, combining it with both gas and electricity, which is more relevant for consumers. When purchasing a heating boiler that works both on wood and on electricity, several problems are solved at once:

For heating, two alternative energy carriers relative to natural gas are used at once.
The issue of cooling down the premises is being solved in the case when everything in the firebox has completely burned out, and a new portion of fuel has not yet been loaded.
Makes more comfortable water heating, since you no longer need to get up in the middle of the night and go to the boiler room to load fuel.

Combined electric wood-fired heating boilers of the latest generation with a large firebox are made in such a way that switching to electric heating occurred automatically when the water temperature in the boiler falls below a certain level. Naturally, the reverse transition to the combustion of solid fuel occurs with the help of external actions.

The design of the electric wood boiler

Externally, the combined TT firewood boiler is in no way different from a conventional solid fuel unit. In fact, this is the same wood-burning heating boiler, the only difference is that it has a heater installed in the heat exchanger. Another important difference from the standard configuration is the presence of a water jacket.

One of the walls of such a boiler is made by cold stamping and has a complex configuration. Heating elements are installed between the walls of the jacket and there is a special contact hole to which the electrical wiring contacts are connected.

This type of heater device is similar in design to a standard solid fuel boiler, which consists of the following main elements:

firebox (combustion chamber), a place for loading solid fuel;
outside it is washed by the coolant, which is inside the water jacket;
a water-tube or fire-tube type heat exchanger, where the combustion products most heat is transferred to water before being released into the chimney;
at the bottom of the firebox there is a grate, and under it there is an ash chamber;
firebox and ash pan in front equipped with doors;
to regulate the intensity of combustion, there is a mechanical draft regulator or an air blower fan (if not manual control air damper).

Household combined heating boilers are distinguished by the design of a water jacket, where a place is provided for the installation of a block of tubular electric heaters - heating elements. Their contacts are brought out and connected to the control panel with the help of an electric cable, and the heating part is immersed in the coolant.

How a combi boiler works

The principle of operation of a solid fuel heater, in which electric heaters are installed, is as follows:

Kindling and heating of the boiler are carried out in the usual mode. When burning solid fuel, the temperature of the coolant is maintained using a mechanical thermostat or a fan together with a sensor, and the heating elements are turned off at this time.
After the contents of the fuel chamber burn out, the coolant temperature in the system gradually drops to certain value, reaching which the heating element (one or several) is switched on by the signal of the temperature sensor. At this point, the boiler starts to work on electricity.
After the next portion of firewood or coal is loaded, the water in the system begins to be heated from the side of the combustion chamber, the electrical part automatically turns off until the temperature of the coolant drops to a certain value.
Electrical equipment is auxiliary.
The heater control unit is used to maintain a certain water temperature, based on the readings of the air or water sensor.

Continuous heating of water is provided by switching from one mode to another, which ensures comfortable conditions in a private house.

Advantages of universal boilers

After installing a combined wood-electricity heating boiler, you will receive the following bonuses:

Versatility. You will have the choice of which of the two fuels to use and when.
Due to the built-in heating elements, the coolant will retain set temperature even after the fuel is given burned out in the loading chamber. This will save comfortable temperature indoors, and in case of your long absence, it will not allow pipes and radiators to freeze.
Comfort. Maintaining the temperature with electricity will be of great service, helping to get rid of the problem of night trips to re-load fuel into the combustion chamber.
If electricity is metered according to a multi-tariff scheme, then in addition to convenience, you can also save on the night operation of heating elements.
Thoughtful device. The heat is distributed in such a way that the loss of thermal energy is close to a minimum, thanks to which the boilers are quite efficient.
Long period of operation. If properly maintained, such a boiler can serve you for at least 20 years.
Autonomy. You do not need to constantly monitor the process - for this the unit is equipped with automation. Especially in the case of operation from electricity, the operation mode using a heating element is limited to an uninterrupted supply of electricity.
You can find models with pre-built pipes in order to be able to connect the "warm floor" system.

Heating combined boilers, which work both on wood and on electricity, cope with their task even in low-power mode.

Disadvantages of combined units

Electric heaters of a universal boiler assume only maintaining the temperature of the water in the system; they cannot completely replace the combustion of solid fuel. The reason for this is the low power of the block of heating elements, which are mounted by manufacturers on solid fuel boilers. This feature, unfortunately, is one of the serious drawbacks of combined boilers for heating a private house on wood.

Heating a private house with a combined boiler that runs on both electricity and firewood has other disadvantages.

The useful volume is taken away from the loading chamber by the block of heaters, which significantly affects the burning time from one load.
The operation of the device directly depends on the stability of the power supply.
The cost of combi boilers is much higher compared to classic options solid fuel boilers.
The efficiency during operation of the heating elements drops by 2-5% due to the air flow that passes through the cooled furnace. The reason for this is the constant draft in the chimney, it forces the air out of the rooms to leave through the chimney and thereby cools the water jacket of the heater.

Do not forget one more important detail. As in the case of a classic solid fuel boiler, a combined heating boiler of the wood and electricity type must be connected to the water heating through a three-way valve, as shown in the diagram below. A small circulation circuit is necessary to protect the furnace from the negative effects of condensate during kindling.

In order to prevent the walls of the combustion chamber from being covered with condensate when the temperature drops, the solid fuel boiler must be connected according to the standard scheme with a three-way valve:

In the event that the power of the heating elements is not enough to heat the coolant to a temperature of + 55 ° C or more, then condensate will never appear in the furnace of the combined boiler during ignition, and the unit with a three-way mixing valve will not be needed. But as practice shows, a small circulation circuit, nevertheless, is necessary, at least in the event of a power outage or a breakdown of one of the heating elements.

How to choose a boiler "firewood electricity"?

Manufacturers offer combined heating boilers that run on both wood and electricity, which differ in performance, power and equipment. When buying this equipment, you need to pay attention to the following points:

Power - given parameter depends on what kind of fuel is used. It is necessary to determine in advance the main type of fuel for the purchased device.
The dimensions of the combustion chamber - its volume will show how often it will be necessary to load fuel.
Silence - installation special valve will ensure quiet operation of the unit.
Number of circuits - some models heat water only with the help of heating elements.
The most economical models are those in which the coil is mounted in the combustion chamber.
Heat exchanger. It is made from both steel and cast iron. Cast iron ones are not so susceptible to corrosion, they give off heat longer, although they heat up longer, they also have a rather serious weight, and with sudden temperature changes they can crack. Steel has less resistance to corrosion and oxidation, but they are lighter and more resistant to temperature extremes.
Grids. The material of manufacture can be very different. They can be both cast iron and ceramics. Cast iron has a higher heat resistance and is suitable for the combustion of any solid fuel. Honeycomb cast iron grate with ceramic coating is suitable for bulk materials, the combustion of which consumes more oxygen.
The weight and dimensions of the unit. Due to the large dimensions, it may be necessary to reinforce the surface area where the unit will be installed with a concrete screed.

When choosing a boiler for heating a house, you need to correctly calculate the power of the device based on the parameters of the area of \u200b\u200bthe room. This will indicate how much fuel consumption will be required. If the area of the house does not exceed 80 m2, then you do not need to buy a boiler whose capacity is designed to heat a house with an area of 400 m2. This may lead to overspending of budgetary funds for the purchase of the unit, and for its subsequent operation.

A combined wood and electricity boiler is perhaps one of the most good decisions for heating a summer house or a private house small area. In a cottage that has 2-3 floors, heating elements will only save the system from freezing. Combined boilers will help out if it is not possible to use a constant and reliable source of energy. In addition, these boilers will save you quite a lot of money if you use more expensive fuel as a fallback.

For the installation of such a boiler, it is better to use the services of a specialist who works in this profile. He will advise the most suitable device model for you and without unnecessary problems it will be installed based on the requirements of safety rules and technology requirements.

Our units run on solid fuel and are designed for wood heating dachas and private country houses of low height. The area of premises heated by firewood is from 80 to 320 squares.

The design of the wood burning apparatus allows additional use of electric heating of the coolant. To do this, a threaded sleeve for the heating element is provided on the rear or side wall of the housing.

This is a useful option for wood-fired boilers, which allows you to avoid temperature fluctuations in the heating system between fires. When using water as the heating medium, electrical heating will protect the system from freezing in case of long downtime during the cold season.

A tubular electric heater with a control panel will automate the process of controlling the unit and expand the functionality of a simple wood-fired boiler.

Heating element installation

The heating element is not included in the sale of the wood-burning boiler, but is an option that must be purchased separately. For combi wood boilers low power up to 18 kW, a tubular electric heater of 1-3 kW is suitable; for devices of 18-32 kW, a heater with a rated power of 6 to 9 kW is recommended.

The control panel with a thermostat automatically maintains the temperature within the specified range by turning the electric heater on and off. The block is equipped with protection against boiling and a light signal.

Heating elements with a power of 1 to 3 kW are single-phase and are powered by household electrical network with a voltage of 220 V, and heating elements with a power of 6 to 9 kW are three-phase and are powered by a network with a voltage of 220/380 V. When installing the unit, connect the ground.