This question is regarding Bristan Pisa Thermostatic Recessed With Adjustable Riser - Shower Spares

pisa recessed

when the shower is turned off the valve is passing cold mains water across the valve and over flowing the hot water tank
Asked 10 years ago by Anonymous
You would seem to have a faulty non return valve, which are in the elbows or the cold water pressure is too much and needs to be restricted.

Answered 10 years ago by Anonymous

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