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I have already had a new ball crane and a brand new hot water cylinder (with thermostat) fittednand none made any difference. I have now fitted a NRV to each hot water feed on the mixer tap. The valves are 100 non return valves (with no slot) and they are fitted the correct way with the...

Yes , all 3 fitted with arrow pointing the direction of the water flow in. Is the feeling that these valves should have sorted my problem ?

I have now fitted the 3 NRV's to the 3 x sets of mixer taps in the house and the problem is still happening. Any other ideas or advice what to try next ?

Good stuff !!!! I will get 3 NRV's at B&Q tomorrow and let you know how I get on. Cheers again.

Cheers for that. Can you confirm that fitting a NRV is in no way dangerous and the problem, whatever it is, will not cause the water to potentially build up elsewhere in my pipework/system causing burst pipes , flooding etc ? I ask because I feel if there is still a problem and the water...

I could fit the 3 non return valves as suggested but would that not just stop the water coming out the overflow but be potentially dangerous as it is not actually fixing or diagnosing the main problem ? Also , I have a 9.5Kw electric shower.

I felt the pipes as you suggested and the pipes that where hot seemd to stay hot for a reasonable time. I cannot seem to find any of the valves that you suggested. One thing though , I had a bath last night and the water wasnt dripping first thing this morning but started later on in the...

Not had a chance to try yet as i am at work. I will try tonight. Somebody also mentioned that it could be the electric shower due to a gravity fed hot water and mains fed cold water. Could this be the case also ?

Blender valves are small mixing valves fitted to hot water outlets. They mix hot water with cold to reduce the hot water to a level where scalding will not occur. They are common in Nursing homes/hospitals etc They are quite rare in domestic properties. They are usually near the tap. They are...

Please excuse my igorance but what do you mean a blender valve ? How do I know this and where are they located ?

No , both are on the same level next to each other.

I will give that a try , cheers. I have an electric shower , is there a test for that ?

I turned off the hot water feed from the bottom of the main storage tank and the water went up through the pipe on the roof , as expected. I have been advised that 1 of the 3 mixer taps that I have in the house could cause the hot water to get into the tank but I dont know how to test for...

Any ideas Tony as to what it could be , based on what i have told you has already been done ?

During the summer for no apparent reason , I got water pouring out of my overflow pipe (from the cold storage tank in the loft). Several plumbers and heating engineers later , I still have the problem. I have had the ball crane and washer changed and adjusted and also had a new hot water...