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I have a leak round the spindle of a rad valve, which stops if I turn it off. It is a Belmont (at least 30 years old). Can I replace the o-ring without draining down? I would be grateful for information how to do it. John

Worcester 27cdi with dt20 programmer, giving separate timings for heating and hot water. What is the point of timing the hot water when it comes on when the tap is opened regardless of setting? Is it just to time the preheat facility? Does the preheat facility use much gas, and is it worth...

These 2 boilers seem very similar, except cdi is a lot heavier. What are the advantages of each? Thanks for any help, John

My daughter has a Gem combi boiler which was in her flat when she moved in 7 years ago. During that times the DHW flow switch has been changed 3 times because it leaks. Tightening the 4 screws sometimes helps, but only for a short time. Is this a common fault, and do I just need to keep...