I made the mistake of reading up on this too late. I received a number of quotes to replace my 40 year old Weil-McLane. All wanted to replace the old boiler with the same BTU rating as the new one. I live in a house with a newly closed cell spray foam insulated roof and just 2400 SQFT of heating space, but the boiler is 175,000 BTU. The calculators suggest I need about 78,000 BTU-120,000 BTU. It is a steam system that is gas fired. The job is half done now, and the new boiler is ready to be installed downstairs. Do I ask him to replace it with a smaller boiler?
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