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Hello,

I thought I’d try fitting a shower pump today. Every thing works, other than the pump just fires water up the vent pipe and into the tank in the attic.

i don’t know where this vent pipe has come from as there isn’t one coming off the top of the cylinder.View attachment 40861View attachment 40862
Hello, the vent pipe is for expansion and stops the expansion caused by excessive heat to hot water supply from damaging the pipe work or boiler. I fitted power pump to my system with the same type of expansion and the only time water is pushed out of the expansion pipe is when the pump is activated while all hot feeds after pump are shut off otherwise it works perfectly.
 

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