In Storage Boilers of any type, there is a reserve of sanitary water already at temperature and ready for use. The boiler keeps it hot, thus reducing ignition times and increasing the responsiveness of the domestic hot water system.
Underfloor heating is a type of distribution that spreads heat evenly throughout the rooms where it is installed. It requires different operating temperatures compared to cast iron or aluminum radiator systems.
In the low-efficiency type C boiler, the air pressure switch detects the operation of the flue fan (exhaust fan). It consists of two tubes connected to the venturi ports of the extractor, functioning as pressure and vacuum sensors.
Before 1994, boilers were equipped with this type of valve for safety in the water supply circuit. Today, modern storage boilers integrate this valve into the cold water inlet group within the boiler.