It was done because someone figured that you needed 5 feet of heat instead of 20 feet of heat. As each foot of baseboard gives about 600 btuh of heat when the water is at 180F in the coldest part of the year, the difference is 5 times 600 = 3000 btuh for the room, or 20 x 600 or 12,000 btuh for the room. As a newly built home needs about 25 btuh per sq foot -
5 ft of baseboard would be required in a room of 3000 divided by 25 = a 120 sq ft room or a
10 x 12 room
20 feet of baseboard would be for a 12,000 divided by 25 = 480 or a
14 x 20 room
putting 20 feet of baseboard in a 10 x 12 room would make it a sauna.
IOW - putting as much fin as can fit in an exposed length of pipe JUST BECAUSE YOU CAN isn't a good plan.
http://www.heatpro.us/designtree/documents/320102B9B4DD4BCB861A84E86CBA97E658AE380B.html
Planning ahead by having an accurate heat estimate for the room and installing the PROPER length of finned tubing to provide the required heat without freezing or overheating you makes more sense.
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