Circulation pumps

A circulation pump moves the heating fluid through the pipes so that every radiator heats up evenly and the boiler runs efficiently. The same pumps are used for underfloor heating and hot water recirculation, so hot water comes out of the tap right away.

The pump is sized by flow (which depends on the boiler output) and head (which depends on the length and resistance of the system). A house up to 150 m² usually needs 4–6 m of head. It is normally fitted on the return pipe before the boiler, next to the expansion vessel.