A bit technical this sorry! Mr C got in touch after fitting our mini-refurb kit and insulation upgrade. The perfectly functional line drawing is his! "...the top drawing is a plan view of the top, the second is the front, the numbers are the temperatures recorded with a laser thermometer when we moved in. The third and fourth drawings are the same points measured after fitting your DIY mini refurb kit. Judging by the drop in external temperatures our [cooker] was very unloved and since fitting the new insulation we have been able to turn the gas down a lot, so hopefully we are much more efficient."
Some rough calculations here, literally on the back of an envelope!, reveal that Mr C has cut the surface temperature on the top by 13.18% and the surface temperatures on the front by an average 19.06%. Less heat out means less heat in and less fuel used. This sort of thing makes me unreasonably happy!
>>See our insulation upgrade kit for use with Aga range cookers kit here or our full range of DIY kits for range cookers.