A note of interest for those with Daikin heat pumps, Daikin have an interactive databook tool here https://daikintechnicaldatahub.eu/en-GB/altherma-3-m/combination/
It gives outputs with and without the backup heater. The following example is with the backup heater:
Without backup heater:
- 11.08 kW at 0C
- 10.94 kW at 2C
Our results:
- 8.7 kW over 4 cycles including defrosts (1.32C outside)
- 7.8 kW on the last cycle at 0.6C outside
Im in contact with Daikin technical support that gave the above link. No light yet on why we’re seeing this difference in output. I will keep this thread updated with any developments. I’m definitely open to the possibility that we have missed something and that greater outputs are possible.
This clarifies at least that we should expect the ~11kW of output without the backup heater and COP’s should be around 2.44 (2C outside)