I have to admit I am a bit lost!
My heat pump is too big for my house, I can’t make it work properly.
It’s a Daikin Altherma 3 9kW.
My heat loss at 21c/-3c is about 3.5kW an hour.
My installer calculated it at 7.3 kW an hour
On a day like today when it is 10c outside I need about 1.5kW of heat an hour.
My heat pump puts out a minimum of around 3kW an hour and doing that the COP is rubbish, a little over 3 at best.
My radiators aren’t big enough to cope at low flow temperatures and the heat pump doesn’t like less than 35c in any case.
The radiators heat my house quite happily to 22c when it is 7c outside flowing at 30c but the COP is less than 3 then.
I have some bigger radiators for upstairs but the ones I need for downstairs, which I am poised to order, will cost about £4,000.
I will improve my COP by fitting these but I am beginning to wonder what the point is.
Maybe I should cut my losses and change heat pump.
Even if I change the radiators I am going to end up with a house that is too hot or banging in chunks of heat every few hours.
None of that is what I wanted, I just want to trickle in a couple of kW an hour on a day like today.
I really don’t know what to do and I wouldn’t normally ask for advice like this on the internet, but I have nobody else to talk to.
Seeing as I have a heat pump already fitted, looking at it and having seen the installation I would imagine that a swap for another brand of heat pump in a more appropriate size would be relatively easy?
Is my Daikin worth anything?
Any thoughts are welcome!