BTU Sizing

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W

wombosi

Member
Sep 12, 2019
7
Great Barrington, Massachusetts
I have a lead on a used (three season old) Buderus G115/5 for a great price.
My house is roughly 2,000 square feet and very well insulated with new windows.
When I run various online BTU calculators I am coming up with less BTUS than the 115/5. However, I want to add a zone out my 400 square foot shop. This boiler is rated at 120K BTUS.

Would the 115/5 still be too big? Just about right? What is the danger in being potentially on the wrong side of either the 115/4 being too small, or the 115/5 too big?

Thanks.
 
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