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You can do a free heat loss calculation on the Heatpunk website; this will tell you your thermal losses per room at a given outdoor temperature, which you then use as a basis for calculating radiator specs.
Pipework primaries should ideally be 22mm, with short 15mm tails branching off to each rad.
Note: the ubiquitous fancy ‘column’ style rads that look nice are all bullshit, and don’t output anywhere near the BTU that the retailers claim.
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That’s what we did, slightly upped the BTU total and based it on 60 (IIRC) but then also insulated/changed glazing on top of that.
Also made it 22mm to all but the last rad on the loop.
Didn’t get into calculating it properly but figured by the time we are forced/allowed to have a heat pump the spec would certainly be good enough.
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ectoplasmosis
Mr_Smyth
@Polygon
I'm going to have to think about new radiators in places soon, ours are old and we're likely to kick off some work to our living space over the next year which will involve moving & replacing them.
If I want to be heat-pump-ready is it just a case of doing the BTU calcs for the room based on a lower Delta T and making sure they're plumbed in with 15mm copper back to the manifold?