"Dave Plowman (News)" wrote:
In article ,
Mogweed. wrote:
Current (and most likely future) gas prices are making it more
economically viable to replace the boiler now before it finally dies.
Putting a new boiler on to 33-year old stuff that's full of sludge and
whatever doesn't seem to be a good idea though and, given that modern
snip
Don't think there's any difference in actual efficiency between one rad
over another. A low water content one will heat up more quickly - but also
cool more quickly. They might be more efficient space wise, though. But if
the old ones are still sound they can be cleaned, and inhibitor will
prevent further corrosion.

With a condensing boiler, larger, or radiators with lower return
temperatures may slightly increase the efficiency of the boiler.