Quote:
Originally Posted by oldE
The only exception to this of which I am aware are the old style cast iron radiators. They will work quite well with a heat pump.
Of course the old cast iron units take a lot of space. I too would do in-floor if I was doing it all over again.
Best
Les
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The way they explained it to me is that it's not the radiator vs floor that is the issue, but the fact that radiator usually needs higher water temps in order to heat up the room (as it's surface area is rather small compared to the floor).
Higher temp in secondary loop = lower HP efficiency.
So it shouldn't matter whether radiator is made of iron or not, as long as it needs higher temp. Also, mixing floor heat with radiators on HP system usually involves a shunt and extra flow pump, which introduce additional losses.
Regards,