What is this radiator?

saias

Looking to identify a radiator and its rating so I can calculate its EDR? Thanks in advance.

Steamhead

That's a cast-iron convector. I'm pretty sure it's an American-Standard.

To find the EDR, measure the height, width and depth, then look it up in the proper chart. There's one here on eBay:

https://www.ebay.com/itm/385628350515

Or you could get @DanHolohan 's book, "E.D.R." which has an almost dizzying number of radiator charts.

saias

Amazing. Sure looks like the Arco Convector. Full catalog and spec - https://heatinghelp.com/assets/documents/American-Radiators.pdf

If I'm reading correctly, I have the 525 with 26" enclosure height which has 23.2 EDR.