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Hello, thanks for your replies. In answer to your questions, the hot water is working fine. We believe the size of the pipes is 15mm. All the rads are different sizes, mostly quite big. There are 8 in the house which is a big 4 bedroom chalet bungalow. The pipes leading up to the valve are...

We have just purchased a new property and went to try the central heating a couple of days ago. The boiler is firing up but very little heat is going to the radiators. After leaving it on for about an hour a couple of the radiators were warm, however, the majority were still cold. We have had 2...