Steam Radiator Sizing

Henri McGill

We are contemplating a one story single room addition (15 x 25 or 375 total new floor area) with an open, cathedral ceiling starting at 8' around the perimeter vaulting up to 12'height at the lengthwise center peak. There will be approx. 90 sq feet of total glass/window area spread around on three walls of this room which will stick out lengthwise from the main house so that three of its walls will in effect be outside walls. The space will, of course, be fully insulated.

My question is how much sq. footage of new steam radiation will I need to properly heat this new room?? AND should that total sq. ft. number be split between/among two large radiators on either end of the room, or 4 smaller ones, one under each window? Or what?

For the purposes of this question don't worry about whether the existing boiler can handle any more connected load...I just need to determine what the approx. sq. ft of the new load will be first.

Is there a formula used to determine steam radiator sizing?

bigugh_4

on the left, look at \"Free heat loss calc\"

and work this out! then find the radiator that will make the job. then see what your boiler will do for the whole house

Steamhead

I would definitely

split the load between two radiators. This will involve some extra piping, but the room will be much more comfortable since the heat won't be concentrated in one place.

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