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BTU Question for steam boiler replacement

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I posted this on the wrong board so I'm posting again.

I am changing my steam

boiler from oil to gas. I currently have a HB Smith boiler with a Beckett

blower with a .85 nozzle. I looked at the Weil McLain instructions on there

website and calculated my radiators to be only 46,905.04 BTU’s. I also have a

hot water loop in the basement with a ten-foot baseboard. The plumbers I know

tell me I should use a 100,000 BTU boiler. Is that too much?  I just want it to be efficient as possible.

The system I use now seems to use a lot of oil for a small house, total 1066 square

feet for the first and second floor. My roofline is steep so the second floor

has a lot of un insulated roof on the walls but the attic floor is insulated.
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