Allegedly cast iron rads are ok with heat pumps: https://www.castrads.com/en/product-category/cast-iron-radiators/
Radiators at the end of the day are radiators, as long as you have the correct BTU for the room it’ll heat no matter what kinda of input.
Price wise they ain’t cheap tho
Sure, but don’t they have a higher internal volume which means more water heated which means worse COP?
@konastab01 started
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Allegedly cast iron rads are ok with heat pumps: https://www.castrads.com/en/product-category/cast-iron-radiators/