Instant hot Water Heater, Before or After the Pump? Drainage and wastage systems and plumbing help, advice and answers

[justintuijl]

Hi, I have a bespoke system in an old building I did myself. At the moment I have the pump before the instant hot water heater. I wondered if it would be better to put it after the pump? So it pumps cold into the heater, rather than pulls hot out of the heater. Thanks for any help.

[justintuijl]

Well, I'm going to try it anyway and see what happens, will let you know.