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# How to calculate EDR for recessed radiator and free standing

## How to calculate EDR for recessed radiator and free standing

#1
02-28-08, 06:25 AM
Member
Join Date: Nov 2007
Posts: 40
How to calculate EDR for recessed radiator and free standing

I will be removing a radiator that fits in 2x4 wall construction.
Height is 19" . Width is 40". 17 sections (16 + one half on each end)

I have found some sites that have charts for tube and column rads but how is BTUH for this type calculated?

Also some confusion exists out there between Tubes and Columns. I have another one that is free standing . Has 5 (tubes or columns) from the side view. 12 sections 26" high. I am coming up with 42SF EDR x240= 10,080 BTU . Is that sounding correct?

This post starts me on getting the knowledge needed to do some more research on this great forum to pose more questions on this project. Project ideas ranges from reviving a tankless coil on my old Beckett oil fired boiler and runing new pex under floor radiant heat to maybe switching to gas with a whole new boiler.

Here are some pics on Photobucket.

http://s270.photobucket.com/albums/jj82/searayboater/

Thanks.

#2
02-28-08, 07:11 PM
Member
Join Date: Jul 2007
Location: United States
Posts: 2,407
Remember it loses 10% if recessed into the wall.

#3
02-29-08, 02:19 PM
Member
Join Date: Nov 2007
Posts: 40
still not sure...

Thanks Rbeck.

I studied the pages.. do I use the same values for water since I have steam?

thanks,

also if you have time can you explain the difference between column rads and tube rads?

#4
02-29-08, 02:56 PM
Member
Join Date: Jul 2007
Location: United States
Posts: 2,407
The info on those pages will give you aquare feet of radiation. If you want to convert it to btu's for steam multiply the sq ft times 240. Cast iron steam radiators will supply 240 btu's per sq ft of radiation. Radiant radiators offer about 2.25 sq ft per section.

Basically the size of the section. A column type radiator has very wide vertical columns if you look at it from the end. Each column is about 2.5 to 3.5" wide and the tube type will have vertical tubes about as big as your thumb. See attached pictures

#5
03-02-08, 05:40 AM
Member
Join Date: Nov 2007
Posts: 40
Thanks- This closes this thread out.

Thanks- I have all I need now to calculate. Hope this helped
others as well.