For the heat pump to work, the home needs to require heat 24/7, great for a care home, or the retired, and those with young children. But were the home is left empty during the day, and only an hour in the morning while getting ready for work, we only want to heat the home 6 pm to 11 pm, once we go to bed, heating can go off.
So recovery speed is important, using sequenced re-heat, kitchen then dinning room, then living room, and finally bedroom can increase the reheat speed, and use of fan assisted radiators can also increase the speed, but my 19 kW oil heater is not really large enough, maybe with heat pump one could get away with half that power, so 10 kW, but that is 43 amp, whole house only has a 60 amp supply, and clearly need to shower, so the shower and heat pump will take the whole of the house supply, without adding EV charging, cooking etc.
So only way is to use a well under powered heat pump, and leave it on 24/7 which means we a wasting loads of power. Yes could use batteries to spread the load, but by time one adds it all up, the cost to the environment to re-pipe as it needs more flow and lagging, and the battery, plus new shower, new water heating, and the problem if the government turn off electric like they did in 1978 your left with no heating, not ideal with solar panels and battery and oil boiler, but at least I have a chance of some heating.
It's great to see resources like Bodge Buster helping homeowners understand air source heat pump installations! For those who want to improve their knowledge even more
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Leonard James Callaghan, Baron Callaghan of Cardiff,, commonly known as Jim Callaghan, has a lot to answer for, he made it so we don't trust having an electric supply, the Labour party killed any idea of people fitting heat pumps, at least those who remember it, so repeating is lease we forget.