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A final update. Thank you for all your help and advice. I have stopped the overflow from the CWSC. The PEV has done the trick and I have a dry patio once more. You're all top bananas.

In order to fit a Pressure Equalising Valve it states, that the water heating system must be able to deliver hot water at a constant temperature, regardless of demand from the system. I have an indirect gravity fed hot water system with a Baxi Bermuda 552 Back Boiler. Does this satisfy this...

Would it not be better to fit a pressure equalizing valve on both feeds instead of a pressure reducing valve on the cold feed. It is indeed a strange set up for the mains cold water to be also running to the bathroom but something I'm discovering is not so uncommon accross the land. If I'm...

I think I've cracked it! As you know I have mains cold water into my bathroom and there is an isolating valve. I have operated this valve and check the cold water tank in the loft. To my joy the hot water backfeeding into the outlet pipe had stopped. I only have to mixer valves in the...

There is a basin mixer in the bathroom and a sink mixer in the kitchen. I thought this hot water service pipe supplies all hot outlets in the house.

There is a service valve attached on the inlet pipe to the shower pump. This is on the hot water pipe you refer to and I have shut this but the overflow continues.

Hello people I'm back with more woes. After isolating the kitchen mixer feeds the overflowing did not stop. What I did however observe, is that the gravity feed outlet from the CWST is backfeeding with hot water. Does this outlet go straight to the boiler to supply it with water for...

After many hours of deducing I think the problem may be with my kitchen sink mixer. I say this as I have a stop valve to the mains cold water in the bathroom, which after isolating does not stop the overflow.

Now that you mention it, maybe I have mistaken the ones in the kitchen as just service valves. It's just that there are already service valves above the ones I mentioned that have levers.

I know that this problem has been done before and I have scoured all the posts but neither I or my plumber can find the solution. I recently bought my first house and had the bathroom refitted. In doing this I had a new bathroom suite installed including a basin mixer and a 3 way...