In an earlier contribution to this discussion,
Roger wrote:

The message
from Sam contains these words:

The radiators in the house are old, single, without fins, and painted
over. Heat outputs unknown.

Stelrad single panel?

23" high.

88" long 5921 Btus/hour.
82" 5498
76" 5075
69" 4652
63" 4229
57" 3808
50" 3384
44" 2961

At what Delta-T value?

Those outputs look a bit optimistic to me - even at a delta-T of 60 degC
(140 degF) my calcs come out a bit lower than that.
--
Cheers,
Roger
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