then you have a modulation problem the gas burner should be dropping down to maintain a steady temp with tap still running ,No not really , with temp control on max (9 o'clock position)if I open kitchen or cloakroom etc fully led,s climb steadily to 70 degrees and with temp in full flame will stay with no cut. If I turn heat control to 6 o'clock position (2 thirds maybe) heat climbs steady to 60 degrees flame cuts temp climbs briefly to 70 degrees , flame re-ignites temp drops to 50 and then cycle repeats .
Thanks John, I have to be honest you have lost me now.. so feel In short as per gas112 I think it's time to have a expert come in and check gas flows, as from what I see there are no other explanations aside from modulation why I am seeing the issue.If 3.6 rotations took exactly 3 minutes then the gas consumption was 22.43 kw giving a boiler output of 19.07 kw at 85% boiler efficiency, giving a HW temperature of 52.17C at 8LPM or if the the temperature is 60C, a flow rate of 6.5LPM. So looking like the boiler minimum output is around 22/23 kw?.
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