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A pressure relief valve has been suggested to prevent the problem I have of running out of hot water due to a punp being fitted to a bath shower mixer . Can the valve be fitted to the expansion pipe...

A pressure relief valve, can this be fitted to the expasion pipe in the loft.

I fit a 1.8b poitive head pump under a bath to supply a bath shower mixer.
The bathroom is approx 3m below the storage cistern which is in in the loft , the hot
Water cylinder is horizontal ,...