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New propane boiler install calculations
I need to install a propane hot water boiler in a 1.5 story, 2000 square foot, well insulated house. The basement is 25 X 40 with an 8 foot ceiling and the former boiler had a direct vent. Each installer I have spoken to, who also wants to sell me a furnace, has given me different specifications for both input and output BTU's, combustion air, direct vent, standing pilots vs electronic ignition. At this point, I do not know who or what to believe. Can someone assist with real world, understandable calculations for picking and installing a probane boiler?