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Morning all. Fitting new DHW heat exchanger at the weekend to my valiant 242e. Before I start how much should I tighten fitting when using the fibre washers?

Hello all. I have a combi boiler and heating pipes have manifold upstairs. I want to flush heating system and radiators but do not want to touch valves on boiler in case they start to leak. To save taking off all radiators could I take off one side valve from 1 radiator. Turn flow / return off...

Hello all, I have an old valiant 242e where hot water flow used to be slow but water did get hot. Recently hot water flow has increased but temp decreased. Temperature adjuster valve had snapped last year so have just replaced so I can slow flow in winter like boiler advises. Now hot water is...