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Many apologies. I forgot to add the line that said I had got a figure of 46Kw when I used the whole house sizing method. Sorry, it all looked way out. That is why I found the Stars number a bit low and have checked that I used the same u-values for the same elements of the model. I'm...

I'm lucky(!) enough to be moving into a large old timber framed house which needs quite a lot of updating . The central heating seems to be in fairly good condition and has a Boulter Pathfinder oil boiler (45Kw), TRVs on radiators but a hot water tank about as far away from the boiler as could...