So, I have had it for a year.
Do I like it, not much, but maybe I have been harsh.
It has had some issues and focussing purely on efficiency, it could have been better.
I had to wait some time for a firmware update to allow me to run it how I wanted to and it has had a few occasions where it has used more electricity than it should have done due to some random inbuilt fault.
However, we have been warm enough, averaging about 20c upstairs and 22c/23c downstairs.
No failures.
It has been a colder winter than normal and for a while it felt like we were living in a cloud.
It has used 3,061kWh of electricity and produced 14,931kWh of heat at an SCOP/SPF of 4.88
The efficiency is pretty good.
We live in a four bedroom detached house and heat an all glass conservatory so not really ideal and is the root cause of many of my issues.
The heating system isn’t particularly great, installed by a clueless diyer with a fair amount of plastic pipe.
All I do have is massive radiators.
And that is all it takes, big emitters, the heat pump is bargain basement and the pipework is rubbish. But the heat pump is oversized and our heat loss is low.
The conservatory makes up about 40% of the heat loss of the whole building, so about 2kW out of a total of 4.5kw to 5kW.
I run it in the most basic form as that is what works best, fixed lwt with no room temperature control and no wdc.
The heat pump has been 100% reliable and is virtually silent in operation at all times.
In conclusion, despite my whinging, it works, it has been installed well, and it is efficient.
My actual electricity cost for one year is 214.27 at 7p per kWh on Octopus Intelligent Go.
I have sufficient battery storage to use that at all times and if I allow 20% for battery losses my costs would be £267.84
That is for space heating and DHW.
If I were on a standard tariff at 25p per kWh then my total costs would be £765.25
A gas boiler would have been £995.40 at 90% efficiency and 6p per kWh plus £100 or so for the gas standing charge.
So, well done Octopus, well done Daikin, it could have been better but pretty good really.
Sorry for the whinging 