Economy 7 Trick

John_Pierpoint

From what I can gather, the efficiency of these things drops off quite quickly with increasing water temperature demand. If you can control the output water temperature, try setting it lower.

Don't for get that the tank needs to be heated to hot once a week to to kill the risk of "Legionnaires" disease. The pump may well have a built in programme to do this.

Like a car's aircon, I would think that the heat pump could appreciate being used once a week, during the winter the pump probably has as "heuristics" function (it monitors the outside temperature, see the temperature is on a down hill trend and learns to turn on the heat in advance of needing it in the house.
People used to instant gas central heating will tend to try to fight the "cleverness" (?) of the pump [when correctly sized and installed!!!]

I rather think that there are some persons specifying these new "green" systems, with little practical experience.

Good luck for the coming winter season.

Disaster story here:
https://forums.moneysavingexpert.com/discussion/2959648