The heat pump is running smoothly thanks. We do have an issue with the Heatmiser thermostat loosing contact with its own base station every time there is a power cut, however short. I have an outstanding complaint with our installer about using a third party thermostat but they are not helpful. That is my only complaint about them. Otherwise they were very good.
My installer was a moderately local company. I’m on the London/Hertfordshire/Essex border and they do Essex. I found them by contacting Daikin sales and asking for approved fitters.
If you have a shortlist of manufacturers you could do similar. In retrospect I would have asked Daikin if they guarantee their fitters’ work. If Daikin had their own fitters then I’m sure they would have used a compatible thermostat from their own range.
I already had a very good idea of what system I wanted, taking not only the heat pump itself into account but also the environmental and labour practices and policies of the manufacturer. A review of manufacturers that I read in Ethical Consumer Magazine praised Daikin for air source heat pumps and Kensa for ground source.
If you still want me to name (and shame?) my supplier after reading this then I will do so.
I see that actually I have already named them!