You say the cold water flow rate at the kitchen tap is 14.5 l/min. If you have a garden tap straight off the mains, check the kitchen flow with the garden tap full on.
I am having a quote on Tuesday for loft and cavity wall insulation so that should solve that problem.
Loft and Cavity insulation will reduce the heating requirement, it won't eliminate it. Use the Boiler Size Calculator to find out your heating requirement and see what difference the insulation will make.
When selecting the boiler make sure that the lower output limit for heating is well below the calculated heating requirement.
That is very good news but the £160 extra was what was involved with the 200 which I fitted about six months ago.
If the new Vitotronic 200 model is so much less then I am surprised the people at the show did not think it was worthwhile telling me. Not even the short German fellow!
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