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Is a PRD the same as a PRV (pressure reducing valve)????

Thanks Guys. I bought a non return valve at the weekend, and its done the trick. The only problem is that it seem to stop the water pump working. Basically, as mentioned the cold water was forcing its way through the mixer shower, in to the hot supply, then through the show pump in the...

Hi All, I am having an issue with my heating system. Basically, my hot water cylinder in the loft is filling up and overflowing. The water is not coming from the ball valve and instead via an internal route. First assumption was that the coil had gained a hole and the water water was coming...