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steam boiler sizing

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Jim_83
Jim_83 Member Posts: 67
in THE MAIN WALL
I am replacing a steam boiler heating a 2 story house with attic. The boiler will be heating the second floor and attic. The first floor is a separate apartment and has its own steam boiler.

My question concerns the boiler sizing. From reading the posts I know it is very important to size a steam boiler based on the connected load.

The connected load is 180 square feet steam. There is a boiler rated at 158 square feet steam and the next size is 271 square feet steam. I know the rule is to pick the next size higher, but in this case, is 271 sq ft too big a boiler. Would I be better off with 158 square feet steam boiler? The boiler will be gas fired.

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