The more the damper is open, the stronger the combustion process, and vice versa. Thus, the volume of air that enters the closed-type combustion chamber is completely controlled by the thermostat, and if necessary, its supply is stopped and the combustion process dies out. More modern models are equipped with controllers that, depending on the specified thermal conditions, control the air flow, turning on (or off) a special fan (see photo below):
Gas boilers are the most common and cheapest units to operate. Boilers can be single-circuit or double-circuit. Single-circuit boilers have one heat exchanger and are intended only for heating. The germany mobile database diagram is shown in the figure below:
Single-circuit boiler connection diagram
Double-circuit boilers have two heat exchangers and are designed for heating and hot water production. The boiler connection diagram is shown below:
Wiring diagram of a double-circuit boiler
Some boilers have separate controls for heating and hot water temperatures.
Electric boilers
A fairly common alternative to gas and solid fuel boilers. Lots of advantages, high efficiency, but long payback period. Connection is simple, like gas boilers, but without cold water supply. Temperature regulation and overheating protection are provided.
Mechanical boiler timer
Using a simple mechanical timer for an electric boiler, there are three options for starting the central heating system:
Boiler with temperature controller
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