Are you sure? It was a menu option on ours. Extremely useful, and something that's conspicuously missing from the PipIt 500 we now don't use.
I
thought it was ludicrous when the installation chap said it wasn't a function!
Have dug deeper and found it under 'advanced'.
They're currently in agreement with each other.
I switched the flat off again for 8 hours, doing meter readings before and after. Didn't catch an electron thief...
Now trying to get a measure of a typical night's heating. Left it on as per usual last night and did before and after readings as well as some very generous back of envelope sums:
Racked up 4.19 kWh between midnight and 8:30am. Call it 4kWh between 12am and 8am.
Assuming that was all from the 2kW heater (which maybe runs more like 2.2kW) with no other appliances or standing charge, rough calculation of heater on for a total of 2 hours out of 8. Scaling that up to 24 hours would be around 6 hours of heater time and 12kWh over a day.
Met Office says it was 5-6.5 Centigrade between midnight and 8am. We've had some flippin freezing day's but I suppose this would be fair enough to take as a happy medium. There'll have been plenty of days between August and February when the heating wouldn't have been on at all. I was in Japan for over 30 of them!
I know the heater hasn't really started becoming active until about 10pm-ish for the last couple of nights. So I don't think I'm running at that level all through the day, but even with that worst case scenario I think I'd be well short of a 25kWh per day average. Yesterday's total was ~12kWh including heating and kettles and showers etc.
Heating's off for the night to get a baseline for background activity. Taking the opportunity to test camping sleep systems. I'll be underneath all this down if anyone needs me...