The house is an extended detached 1960s chalet bungalow insulated as well as possible without extensive works. We were running it at AI +5 last year for a period but the default setting seems to heat the house reasonably well although the radiators barely feel warm.Д®ssentially I followed the usual advice- to cut down on the heating cost reduce the house temperature to the minimum you can live with. Setting the ASHP to AI mode at the zero setting- the ASHP running between 30 to 40 deg.

We also use the short term temperature boost facility.ДЄdjusting the thermostat to give longer on periods for the ASHP. The heating is controlled by a wireless thermostat, we will move this to the coldest room when needed. House demand temperature reduced to the minimum we can live with (19deg) during the day and dropped by 0.5deg overnight. I know that this is less efficient in real world terms but it will end up cheaper for me due to the way that the FIT scheme works. I may change this to late afternoon/ early evening to get most benefit from residual solar energy in the summer being diverted to the immersion. Hot water on a timer schedule to heat first thing in the morning. Since then I have arrived at the following through various experiments: The reference point for the 20% reduction was the ASHP as left by the installers: running unsheduled for heating at 45deg and hot water at 55deg, house temperature demand 20deg. Solar generation: logged from the solar export meter by optical pulse counting over a two minute time period- kWh The total house demand: logged from the house smart meter by optical pulse counting over a two minute time period- kWh.ДЄSHP and immersion electricity usage - measured by meters, meter readings read approximately every two minutes by the MMSP monitoring system installed with the ASHP- kWh.

Sontex supercal 531 user manual