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sizing a steam boiler w/ a forced hot water &indirect htw. load

Mike Umholtz
Mike Umholtz Member Posts: 3
in THE MAIN WALL
I need to size a steam boiler. The house that it is in has half of the house as steam heat and the other half is forced hot water. The boiler also feeds a indirect water heater. I came up w/ a number of 142 sq. ft of steam radiation (34,080 BTU, a load of about 44,000 BTU's of forced hot water, and according to Amtrol who makes the 41 gallon indirect water heater, it requires about 120,000 BTU's (Max BTU's is 140,000). Can you please help me size the boiler? I like using Weil-McLain boilers, and in this case it would be their SGO series.
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