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Thanks for the reply, yeah been wanting to take the step too but thought I would seek some second opinions first. Btw the pressure release valve was leaking a bit on this so had it changed a few months ago. Can anyone recommend (or is) a good installer that services the North London area...

Hi all, Got a Keston Celsius 25 boiler that's giving me problems. The pressure on it keeps dropping and it's gone from a slow drop to a very quick drop these days. When it's just running hot water it doesn't drop very much but when the heating's on as well it tends to go from 1.0 bars to...