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You're under estimating how big radiators will be required for heat pumps, manufacturers of boilers are putting too much money into hydrogen that'll be for sure next rather than heat pumps in old houses. The cost is going to be too prohibitive for most consumers for heat pumps and everything that goes along with it.
konastab01
I don't know the answer to this (do you need to consider whether your boiler is powerful enough?) but when I installed ^ those radiators ^ I didn't know that heat source pumps need bigger rads.
So when we do downstairs I am wondering the same thing - aesthetically we'd prefer smaller ones but if gas central heating is ultimately going to be done away with I don't want to have to rip up all our nice original restored floorboards to put in bigger rads...