Independent heating is actively used in private homes and cottages, where there is no way to connect to the heating network. When designing autonomous gas heating, you need to consider all the technical nuances and needs of residents. A dual-circuit gas-fired boiler is the main heating element, so you need to decide on its type and characteristics in advance. To choose the right device, you should use the recommendations of professionals.
Criterias of choice
Owners of apartments and small private houses often choose double-circuit boilers. This is due to the desire to get several engineering and technical solutions in one device. Thanks to such models, a heating system and hot water appear in the house.
In order to choose the right installation for an autonomous heating system, all the requirements should be clarified in advance:
- the area of the house or apartment where the boiler will be installed;
- climatic conditions in which the device will be operated;
- heating season;
- minimum required number of cycles for turning on and off the device;
- the number of inhabitants of the house;
- level of household comfort (arrangement of insulation, heating intensity).
It is better to purchase a product with a high rating from a popular manufacturer.
Technical specifications
When choosing a boiler, first of all, you need to pay attention to its compatibility with the water supply system. Malfunctions can cause damage to the radiators.
The main field of application of double-circuit boilers is the heating of small-sized premises in which hot water supply is not connected with the long length of pipelines. The number of permanent residents of the house is also taken into account. If it is necessary to operate several points of analysis of hot water, a shortage of volume may occur.
Description of a double-circuit gas boiler
A double-circuit gas boiler is a small boiler room in which there are necessary functions for domestic use. Thanks to the availability of automation devices are safe. There are different types of boilers that differ in installation method.
Wall models are practical, inexpensive and convenient, so they are more common than other types. They are often placed in urban apartments. Wall-mounted boilers are lightweight due to the use of light stainless steel and bimetal materials. Water heating is flowing, therefore, no storage tank is needed. Pressure is generated by one or two pumps. Sensors, automation system and other elements have minimal dimensions, therefore, the boiler itself is compact and miniature.
Outdoor devices weigh more and are more powerful. They include a storage tank. The design uses cast iron and steel. The model is installed on a special place or in a separate room with a hard floor. The room where the boiler is located must have an exhaust hood and a flue system. Suitable for heating large houses.
Allocate products with natural and forced traction. The first are cheaper, but a chimney is required for their operation. Closed firebox devices are more expensive and more massive, but they are reliable and practical.
If the house uses hot water intensively, you can additionally put a storage tank of 50-60 liters. The boiler will ensure the preservation of the required temperature for a long time.
Automation and Power
Gas heating devices must be equipped with automation. Sensors and sensors or mechanical components ensure safe, stable and reliable operation of the boiler. The device can work in various modes, analyze the status of all mechanisms of the working device. Products with electronic systems are more expensive than mechanical ones, but they are more convenient and simple. But they are suitable for installation in homes with stable electricity. When power surges or turn off the boiler will not work. Mechanical models are cheaper, independent of the mains and are more reliable. Almost unpretentious.
The key technical characteristic by which a double-circuit gas boiler is selected for heating a private house is its power. It directly depends on the number of hot water intake points. Also, the required load is affected by the area of the room and the availability of high-quality thermal insulation. The worse the insulation, the more powerful the boiler will be required.
A boiler with a capacity of 24 kW is enough for a house with an area of 200 sq. M. But if the house has two bathrooms, this capacity will not be enough for optimal water supply. In this case, it is recommended to take the model at least 40 kW.
Of the entire load of the boiler, about a third is spent on heating, which is about 10 kW. All other power is required to heat the water.
When the required amount of power has been calculated, 10-20% of the margin must be added to the obtained value. Part of the energy is spent on heat loss, so they need to be taken into account. To reduce losses, it is important that the house has good thermal insulation.
Heat exchanger selection
Modern double-circuit boilers are made with two types of heat exchangers. These include separate and bithermic devices.
Separate boilers are products with two heat exchangers. The main one performs the role of heating the heating system, the second heats the water. Such devices are more expensive due to the large number of additional functions and elements. The main advantage is that there is no scale from indirect heating. Also, with such a system, water does not boil.
The double-circuit wall-mounted boiler with a bithermic heat exchanger has dual parts. At the same time, water is heated and the room is heated. Cons - the formation of scale, the deterioration of the permeability of the carrier and water in the pipe. Pros - low cost.
Rating of the best manufacturers
The production of gas-fired boilers is handled by many popular global companies. In particular, these are the Russian Neva, Ariston, as well as foreign Viessmann, Vitopend, Bosch and others. All offer proven products with appropriate warranties. Each model should be accompanied by instructions for use and installation, clips and other elements, as well as a passport and warranty card.
Buderus gas boilers are very popular. They are designed for 24 W power, which is enough to heat an apartment and a small house. The advantages include a long service life, the small size of the wall model and build quality. They cost more than analogues.
If you need a powerful floor boiler, you can buy Westen Quasar from the Italian company Baxi. Russian boilers Navien de Luxe are also distinguished by their good characteristics and value for money.
You need to buy the device in a professional store. Since boilers are installed for many years, they must meet all the characteristics and not lose them over time. Models of unknown production will last less and may not support all the criteria stated in the documentation.
In order for the heater to work throughout the entire period without difficulties and problems, the operating conditions must be observed. You can find out what requirements for the installation site and the microclimate are presented by the device in the device passport.
