So this is an interesting one! I've always meant to actually measure the improvements possible by upgrading the insulation in the doors and lids but never quite got round to it! Thankfully Mr Harris in Bristol, who recently installed one of our kits with optional insulation upgrade, did some before and after measurements.
The figures below are in centigrade and refer to the surface temperatures of the various items, a good proxy for heat loss and thus efficiency.
Overall I'm delighted with these figures. The hotplate lid efficiency is obviously the most crucial so to decrease the temperature on the outside of it by ~18% is amazing and should translate to some useful fuel savings!
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