Hi Matt
I think the other factor to consider with the comparison between heat pumps (another one I know), is the primary pipework. If you reduce the dT, you need more flow or bigger pipework to carry the same heat. At least I think that’s correct, our systems will all have a different pipe layout which is either good or (as in my case) less able to deliver the required heat. Just thinking back to the radiator balancing discussion from a few weeks ago:
And on the temperature measurement position. I might not have the same monobloc as you lot, (reminder mine is the older Daikin 11kw) but I have occasionally noted down readings of the leaving water temp in monobloc, the backup heater which is separate to the monobloc being in the house (and now very much disabled) and on the Sontex heat meter and I also seem the same pattern of losses through the backup heater.
I’ve run some stats on the energy produced for 2022 which might be useful to show the difference between the in-built sensors and a certified meter.
- Elec used (form the meter): 3938.3
- Heat Produced (from Daikin controller): 10598 = SCOP 2.69
- Heat Produced (From Sontex): 11027.3 = SCOP 2.80
~ 4% more measured by the ‘certified’ heat meter.
Just thought that would be interesting for the discussion above. I don’t know whether ESPAltherma can be used with my heat pump, and I wouldn’t know where to start if it could. In my case BEIS/OVO provided the meters to enable me to track performance. And now I’ve managed to grab the data feed off them I have improved the SCOP, and it’s looking more like 3.4 rather than the 2.8 of last year.