What double-circuit solid fuel boiler to buy for home

09-04-2018
Heating

At present, the range of heating equipment operating on different types of fuel is quite diverse. You can easily buy boilers for gas, diesel, electricity. However, in our country traditionally prefer traditional solid fuel - wood and coal.

Such boilers do not need permits for installation, and our goal is to tell you how to choose them correctly.

Double-circuit heating boilers for solid fuel of various types

In rural areas, such equipment is often used not only for heating, but also for hot water. Therefore, we consider just such boilers in our review, focusing on their technical characteristics.

Features of the equipment

Before buying a boiler model, answer three questions for yourself:

  • What fuel decided to use in larger quantities?
  • What principle of burning are you most interested in?
  • What type of heat exchanger should be installed?
Solid fuel bypass pellet boiler

Fuel

Firewood
  1. The most affordable fuel today is coal and firewood. It should be borne in mind that not all models can work with anthracite, it is better to use lignite.
  2. When using firewood, you need to monitor their humidity - raw logs will not give the desired result. At the same time, the efficiency of well-dried firewood is much higher than that of briquettes and pellets.
  3. Choose models for which one bookmark is enough for 12 hours of normal work.
Pellets
  1. The product of the processing of secondary raw materials, which remains from agricultural waste and wood.
  2. When choosing equipment for pellet heating, you need to be sure that they can be purchased freely at any time and in the right quantity.
  3. The boiler is convenient in operation, makes it possible to install an automatic feed of raw materials into the furnace.

Now such equipment is more concentrated in the industrial sector.
Chips and sawdust
  1. Equipment designed for working on chips, sawdust and briquettes should be installed near or at wood processing enterprises.
  2. The instruction does not recommend the use of such boilers for the house as the main source of heat if the fuel does not have permanent access.

Tip: for maximum savings, it is better to select models that can work efficiently on several types of fuel.

By what scheme are solid fuel double-circuit heating boilers can be understood from this illustration

Principle of burning

An important aspect on which the comfort of using equipment depends. You will agree, not everyone will agree to throw fuel into the firebox after 4-6 hours, especially at night. In addition, in the wintertime, it is necessary for someone to be constantly in the house, who will keep an eye on the boiler (also read the article Infrared heating systems: types and advantages).

You can choose the option with a large furnace or controlled combustion. Although in the first case the equipment will be several times cheaper, it will not solve the problem anyway, but will only postpone it in time.

Solid fuel bypass boilers long burning sawdust

We recommend to pay attention to the pyrolysis technology, where the option of upper combustion is used. The equipment because of this can be operated offline for several days.

Boilers are offered in two types:

  1. Gas generator models - designed to use the maximum possible amount of heat in the combustion process.

The design consists of two chambers:

  • large - for loading and pre-burning fuel;
  • smaller - for afterburner remaining.

As a result, the efficiency of the installation reaches 98%, which often plays a large role in the selection.

From the negative - the high price of gas generator boilers long burning, which can run on solid fuels. In addition, there is no particular choice of models. But, if you have a desire to save as much as possible on fuel and get autonomy, we recommend to look at them closely.

Pyrolysis double-circuit solid fuel boilers long burning
  1. The boiler with the upper principle of combustion can also be operated offline.. He very often has a ceramic furnace and rather complicated automation that significantly increases the cost of the product.

Of the benefits:

  • does not require constant care;
  • high efficiency;
  • automatic equipment allows to leave a copper for a long time without supervision;
  • can be connected to a heating system where forced circulation is not required;
  • safe to use;
  • manufacturers give a long warranty on the equipment.

Of the minuses:

  • metal parts inside the boiler are poorly cooled;
  • loading can be done by hand only with dry wood of a certain size;
  • it is difficult to get rid of condensate that may form due to water pressure or increased thrust;
  • it is difficult to ignite the furnace, which is half loaded with fuel;
  • Do not use sawdust or small chips.
Automatic double-circuit solid fuel boilers

Heat exchanger material

This is an important aspect, it must be taken into account when selecting a solid fuel boiler that can burn for a long time.

Usually used steel, ceramics and cast iron.

  1. Steel parts make it possible to reduce the cost of equipment. They normally tolerate temperature differences, but quickly rust. The lifetime of such a heat exchanger does not exceed 15 years.

Tip: This option is suitable for providing temporary needs for heat.

  1. The ceramic version is also made of steel, but ceramic spraying is produced from above.. Such parts are used in new generation boilers. For all the characteristics they are superior to any other options.
In the photo - solid fuel boiler section
  1. Cast iron heat exchanger is assembled by hand.. The material is not afraid of rust, but it is quite expensive and subject to mechanical loads. The term of operation is up to 30 years.

Conclusion

The above-considered options for long-burning equipment have both positive and negative technical characteristics, therefore, when choosing for a house, this must be taken into account. We recommend to prefer models for which there is a surplus of fuel in the given territory (see also the article Infrared heating with the use of various equipment).

The video in the article will help you find additional information on this topic.

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