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Hi Tony Thanks for your reply The issue with the boiler is that it will not work at 100% for more than a minute. Thottling back the flow rate resolves the issue however when doing so, the flow rate is totally unadequate - a bath takes an age to fill and when showering, you literally...

Hi Tony Thanks for your responce. It has been maintained by BG since day one - they installed it. With regard to turning down the flow rate, yes the boiler is more than happy to sit at '70%' and does not modulate. It only does it when your trying to run at full whack. You can hear it...

Anyone? Any ideas? Cheers, D

Hello All! Looking for some advice (to save me $$$) Have recently moved to my first house with the missus and we have a Ravenheat RSF 820/20. Central heating seems fine although these days its on constantly and its still freezing. My feeling is thats down to inadequatly sized radiators...