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Sizing cast iron radiators
We were referred to this site as the best place to get knowledgable advice for our problem.
We need help sizing hot water cast iron radiators for two rooms in a gutted renovation of a 120 year-old house. We have installed underfloor radiant pex tubing (staple-up) in most of the rest of the house. The water temperature from the new boiler will run at 140 degrees for the heating system. We will insulate thoroughly.
The two rooms that need radiators are each approximately 170 square feet. They are bedrooms that will be used as offices/guest rooms. Our plumber calculated the heat loss at 6,000 btu/hr for room #1, and 7,000 btu/hr for room #2. He has said the bigger the radiator the better, but we are concerned about weight and getting huge radiators up the stairs.
The radiator for room #1 will go on a wall that is 4' long. Will a 38" x 38" (15 section) x 8" radiator be sufficient for this room?
The radiator for room #2 will go under a window that is 27" high. How large a radiator will we need?
Much thanks in advance for your help,