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hi i would like to know how to size radiator for bedroom my heating is steam.:)
You would have to first get the heat loss calculation of the room (how many btu's/hour are oozing out of it on a cold day) by doing one of the free heat loss calculations below.
You would then obtain a radiator that has a similar heat loss.
Usually the EDR (equivalent direct radiation) of the radiator is obtained (see sites below), then the HLC is obtained from that.
If you have to buy a radiator, try the Yellow Pages for a used plumbing supply house, demolition co. or Salvage Yard.