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If weather compensation works at all, then milder weather leads to lower flow temperatures anyway. What sort of flow temperatures does your system get down to? My fuel bills have been very low. Which is the good news in what has been a pretty sad affair.

I have done a long post under "Vaillant weather comp - lower curve = less gas used" which explains my special interest in setting the VRC430. I will try not to repeat too much of that. I think that it IS a case of trial and error. It ought to be straightforward unless the integration in...

I am the proud owner of a VRC430 which is set as a roomstat in my main room. The boiler is an EcoTec 415 open-vent boiler fitted in a fairly standard Y-plan setup via a VR65. House is small 3 bed semi with cavity insulation etc. I'm a retired person and very keen to be economical with the...