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not if they have been sized right they won't be. The issue is you need larger because of the lower temps.
How does running a condensing boiler at lower temperature factor into this. Are the calculators still expecting 1980s scalding hot temps?
With a TRV on it, doesn't an over sized rad just get the room up to temperature quicker and then get the flow rate restricted. Is there a down side, other than taking up more space?
user69121
I mean not if they have been sized right they won't be Howard. The issue is you need larger because of the lower temps.