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

--
Roger Chapman