Dear all, I have a combi boiler in my house. The tendency for the flow rate in the shower upstairs to be be reduced when a hot tap is turned on downstairs really bothers me. Presumably, the water is preferentially drawn by the downstairs water outlets because of the pressure differential. So, am I correct in thinking that a sensible solution is to fit a pressure reducing valve to the downstairs hot water supply to the taps in order to balance the resistance to flow of up and downstairs? Obviously the flow rate in the shower would still reduce when a downstairs tap is turned on, but am I correct in thinking that the effect should be less marked?
Thanks, Jim.