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Right then, today I changed a basin tap fed by an unvented cylinder. It was fitted with isolators so I didn't touch anything on the supply side. When I'd done I tried the tap, cold fine, hot ran cold. Tried the bath, that was fine. Tried another hot tap, that too was fine. Went back to the basin, still running cold! I thought it could be back feeding somehow so I closed the cold iso - still cold? Left the basin running & tried the bath again. The bath ran hot, then I noticed the basin was now running hot. Turned off the bath & the basin went cold. Went & turned on hot in the kitchen, fine, went back to the basin which was now running hot again. Turned off kitchen tap, basin went cold again. Next I tried one of the showers. That didn't run hot until I opened another hot tap!
This seems to be happening throughout house, you have to run 2 or more outlets to get any hot water. There's no balanced cold supply or any sign of a TMV anywhere (unless it's under a floor somewhere, which would be a dirty trick!). The house has a master bathroom, 2 en suites, kitchen, utility & cloakroom. When you do get hot water to run, there can be as much as 7-8C difference in temp between any 2 of the outlets.
The whole thing just fried my head! Your thoughts please.
This seems to be happening throughout house, you have to run 2 or more outlets to get any hot water. There's no balanced cold supply or any sign of a TMV anywhere (unless it's under a floor somewhere, which would be a dirty trick!). The house has a master bathroom, 2 en suites, kitchen, utility & cloakroom. When you do get hot water to run, there can be as much as 7-8C difference in temp between any 2 of the outlets.
The whole thing just fried my head! Your thoughts please.