In message , Paul
writes
One thing I've noticed, is the home heating people aren't
very good at design.

The ductwork on houses is seldom all that good. A long narrow
pipe is expected to deliver the same air as a short larger pipe.
All sorts of non-intuitive stuff going on.


It's just coming up 35 years since we swapped the tepid air for
radiators (and 31 years since we sold the place), so I can't give you
figures, but IIRC, the ducting would have been something like 8" x 6",
and I haven't a clue what the output of the heating unit was. The gas
boiler that replaced it (physically a similar size) was a vast
improvement.

Adrian
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