Non return valve

I have been told that I need to replace the nrv, I have replaced the thermo valves, plumber now thinks the issue is with the cold water feeding into the hot supply,therefore not enough hot water. How many do I need for a shower supply, I have two showers off one pumped supply. Thanks
Asked 3 years ago by John Walsh, Hitchin
You may need two for each shower, depending on how many are faulty.

Answered 3 years ago by Barrie Seabright

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