Control DHW circulation pump with timer
Depending on the frequency of use, normal DHW circulation pumps suffer from calcification or corroding of the impeller mechanism, resulting in replacement of the pump by the installer (he does not repair any more!) At a cost of around 200 euros.
With an electronic (not mechanical!) Timer can be about 4 times a day for about 1 minute turn on the pump, which according to experience, the pump "keeps going". Prerequisite is a power-mains socket, is powered by the pump in parallel or in addition to control by the heater with electricity and a still working pump (may possibly be done in do-it-yourself-procedure for crafts-experienced manually again! ).
