Pre 1935 Steam Wall Radiators

Chris Maderia

Can anyone out there help in figuring out how to calculate SqFt EDR for some old Wall Steam Radiators and turning them into btu. I have attached a picture of the type of radiator. It is firgure 21.

In Room 1 I have 4 on 2 walls that are 2'x 1' in a bank of 4 and 1 wall that has 1 2' x 1' in a bank of 10.

In Room 2 I have 2 that are 2'x 1' in a bank of 20.

Thanks in advance for any help you may give....

Steamhead

Each section of standard wall radiation

whose measurements are probably closer to 21 x 13 inches, is rated at 7 square feet EDR. On steam, each square foot EDR gives off 240 BTU. On hot water the output will vary with the water temp, but with a boiler temp of 180 degrees F and a 20-degree delta-T, each square foot will emit 150 BTU.

BTW, #24 is definitely pre-1935.

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Mike T., Swampeast MO

Looking Through \"EDR\"

Can positively identify only one: #23 It is an American Rococo #7-A. Should measure 13 5/16" h x 21 7/8 l. EDR is 7 sq. ft.

The Rococo was made in other sizes: 13 5/16" x 16 5/8" has 5 sf EDR; 29 1/16" x 13 5/16 has 9 sf EDR.

Sizes were rather standardized so you should be able to compare #21 and #22 to the Rococo measurements. Looks like #22 is either 5 or 7 sf; #21 probably 14 but maybe 10 sf.

#24 unlike anything in EDR. Looks like they tried to pack some "extra" radiation surface into a smaller area. By eye I'd say 5 or 6 sf.

#20 looks like it could be a Lincoln Wall Radiator. If so, EDR is 3 sf per section (38"); 2½ sf per section (32"); 2 sf per section 26"; 1½ sf per section 20".

You should be able to use the measurements for the Lincoln for #19 as well.