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Guess it would be an isolation valve, just called it a check valve as that's what it said on the diagram I was looking at.

I just put one in so I can isolate the pump and clean the filers as and when.

22mm all the way to within half a meter of the shower. From hot water tank to pump is about 1/2 meter 22mm. That's out of the Warix flange, into 22mm check valve, through 90 bend, then straight down into pump, all 22mm Pump output 22mm for approx 3m, then 15mm reducer before going into a...

No, sorry I should have been more specific, the cold water tanks are fine, they happily keep up with the demand, with hindsight there was no need for me to mention that part. The sole problem is after running the pump for more than 3 to 4 mins with hot water required(not 100% hot water, just...

I don't know if anyone is able to give me any advice regarding the supply of hot water to a shower pump. Firstly I will point out that I have read a great deal on the subject I am just unsure how to proceed with my predicament, that's why I would be grateful for any advice. I have a 50...