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Only way of controlling the water temperature that I can see is the valve on the pipes outside the cylinder, it's the same as a radiator valve, goes from 1 - 7 and has a max. You can't have only hot water other than turning the radiators off. All the radiators still seem to get just as hot...

Thanks, There's some pictures. The clock is a Danfos SET1E. There are 3 tanks in the loft, the expansion tank, hot water tank and the cold water tank for the hot water. No motorised valves that I can see, only valves are the radiator ones and the aforementioned one on...

As you can see, the larger diameter pipe going to the loft is the one that flows into the header tank, the smaller diameter one comes from it. Both are on the outlet of the boiler but before the pump. The pump is on the correct way. From what I can see the hot water and heating are all on one...

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Hello Everyone, I have a tendency to waffle so please bare with me!! I have recently moved house (flat), I detected a small puddle water in the loft which I assumed was a small leak in the roof, closer inspection revealed that the expansion tank was heating up and steam was condensing on...