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Thanks also to D_Hailsham This gets even more interesting.... Your comment on the offical guides and the idealistic theory articulates what I was thinking. We're not totally profligate with heat, I guess an example of what I am trying to get round is: fair bit of background heat (bodies, TV...

Thanks again , all. I'll try the TRV/lockshield sugestion on the living room rad. The boiler is a Worcester 24SBi installed 2001 I will have a hunt on the web for the Potterton gadget. I'm not sure how to reduce the power though - does that mean adjusting the burner settings or is there a...

Thanks both, impressively swift response! Yes, there is an internal bypass - I've experimented and from full-open to closed it only changes the cycle by about 5 sec (from about 1 min). The installer fitted an external by-pass as well - might that make more difference? I will revisit the...

Is it possible to retrofit an anticycle control to a system boiler? The family like everywhere to stay warm (TRVs on all radiators) which is achievable by setting a very high temperature on the room thermostat (higher than the room TRV) - but then the boiler cycles like crazy. The controls...