Gas boiler with boiler: how to choose and connect

The desires of each homeowner are quite understandable to ensure their dwelling with the necessary sanitary conditions and amenities, without overpaying for this extra money. It does not always make sense to organize a separate DHW system when there are simpler comprehensive solutions, such as a gas boiler with a boiler. The main thing is to correctly calculate the required amount of water for economic needs and choose the aggregate of the corresponding performance.

Types of layout

The advantages and disadvantages of the two-king gas boilers are well known, they are quite good for servicing 2-3 small consumers. But what to do if consumers are more, and the use of electrical water heaters is excluded? There are several modern solutions for this:

• Wall gas boilers with built-in boiler.
• Heating plants with remote cumulative tank for hot water.
• Boilers indirect heating.

Practice shows that a family of 3 people for economic - sanitary needs is enough to have a capacitive electric heater with a capacity of 50 liters. Of course, it is understood by the use of hot water within reasonable limits. In order not to acquire such a heater and do not engage in extra cables and pipelines, you just need to choose a wall-mounted heating unit, within which the tank has a capacity of 46-50 liters. Its design is two in one: a gas boiler with an indirect heating boiler inside. The principle of operation is maintained: one part of the coolant is in the system of heating at home, and the other - in the coil of the inner boiler. Reaching a certain temperature of the water in the tank, which is determined by the sensor, the entire volume of the coolant switches to the heating of the house.

1 - fan - smoke; 2 - heat exchanger of increased productivity; 3 - combustion chamber; 4 - tank - stainless steel drive; 5 - Control unit with display.

The design of the heater includes 2 circulation pump, one pumps the coolant through the heating system, and the second - through the boiler's coil, while the burner works at a maximum for the speedy water heating in the tank. Later, the scheme goes into the mode of maintaining the water temperature, which reduces fuel consumption.

For reference: The suspended boiler Viessmann with a capacity of 12.5 kW with a built-in tank capacity of 46 liters, can provide a nominal productivity of hot water about 14 l / min when it is heated from + 10 ° C to +40 ºС.

More powerful wall gas boilers are equipped with containers and greater capacity, but usually it does not exceed 100 liters.

Decision with remote cumulative tank

14 liters or a half bucket of hot water for one minute - the indicator is not bad, but not always enough. The dimensions of the suspended heat generators are limited, so they can not be put on a large volume vessels. But it is precisely the amount of heated water in the reserve that the long-term performance of the DHW system is determined. Yes, and the weight of the structure together with water will result in such that it will not be given any wall.

Many manufacturers offer heating units with built-in tanks in the outdoor performance, but significantly increase their size for placement inside the large capacity also does not make sense. When you need a great performance, it is worth paying attention to the remote vessels for hot water.

• A - thermal insulation of polyurethane foam;
• B - connection to the water supply;
• C - the yield of hot water;
• D - Heating coil, located at the bottom of the vessel;
• E - stainless steel vessel;
• F - technological opening for maintenance.

Such remote boilers with a capacity of up to 500 liters can be connected to heat generators in which such an opportunity is provided. That is, to connect a separate vessel to the vessel, the unit must have the output nozzles, and inside the circulation pump serving the circuit of the DHW. At the same time, the power of the gas boiler needs the appropriate vessel capacity, otherwise the water in it will never reach the normal temperature for use.

The fact is that the controller managing the entire scheme holds in priority the heating system. If the temperature of the coolant in the circuits of the system falls to the lower limit, the control unit will send all the installation power to the increase in this temperature, and then on the outline of the DHW. In this situation, you can use the functions of the controller, programming the preparation of water of the required temperature at a certain time of the day.

Connection scheme of indirect heating boiler

Remove all problems with an insufficient amount of hot water or its underpressure will help only a full-fledged boiler for indirect heating, equipped with an additional insert of electrical water heating. Such a solution will always maintain the temperature of hot water at a given level.

• A - protective magnesium electrode;
• In - metal vessel with enamel coating;
• C - polyurethane foam isolation;
• D is the heating element in the form of a coil.

In this case, you will have to attach an external boiler for a gas boiler according to a circuit with a circulating pump. One of the leading manufacturers of the Viessmann heating equipment offers the following connection scheme for a separate container to the DHW house circuit:

A - getting hot water; B - circulating circuit; C - circulating pump; D - check valve; E - discharge into the sewer; F - safety valve; G - valve; N - valve - flow regulator; To - a gauge for a pressure gauge; L - check valve; M - emptying the system; N - connecting to a plumbing network; S is an expansion tank of the DHW circuit.

The electric heater is supplied by the manufacturer as an option, it must be connected to the electrical network and tie with the boiler installation controller.

Conclusion

The use of gas boilers with a boiler is one of the best comprehensive solutions to ensure private house heating and DHW with reasonable costs. For this reason, they conquer increasingly popular with homeowners, moving into the second plan for flow heat exchangers of dual-circuit units.