The rule of thumb calculation comes in about 3kw using a years worth of heating gas consumption. I think that is low, we don’t run our heating 24/7, its off during the day while we are at work and over night. Maybe I need to run the heating on a constant setting for a few days or do something else.
Before switching to a heat pump I ran my gas heating at 45 °C for a year, well, in the winter anyway, so I was confident that a heat pump would work. I had to get the heating to come on up to an hour earlier than previously to give a longer warmup time but it did save gas.
For the last few days my 6kW heat pump has been running at 28 °C to 32 °C but I am now home most of the time (retired, house husband) and the heating is on whenever it gets the urge throughout the day.
I suggest starting a new thread if you wish to discuss heat pumps further.
Ok will start a new thread if i think I need to.