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Fernox X400 I think.

Our somewhat old heating system is a one pipe system and now there are a number of radiators that are hot on top and cold at the bottom. Standard problem of sludge I guess. I have tried some chemical treatement but with limited success. Is it worth trying a powerflush? I think I've read...

I'm looking to have a boiler installed that has a narrow flue - perhaps 50mm, due to its location within a listed building. The keston is attractive as it offers a narrow flue, but there are lots of questions about reliability. Is the keston range as bad as people make out? If it is, can...