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I don't know - some radiators are old the type with sort of dimples but they seem to be hot enough. It's the new ones that seem to be hot at the top. There are 6 new ones - probably been in about 3...

We have a 120FF Glowworm boiler with 16 radiators. It was installed about 7/8 years ago - three of radiators were added later. Radiators have thermostat valves but they are always on 5 becaue they...