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EDR Calculation Check

I'm looking to replace my boiler. Current is an HB SMITH 6 Section boiler nameplate says 1290 Sq Ft Steam and 309,100 BTU. But it's got a conversion unit attached so this is questionable I guess.

I've attached an excell sheet with all the calcs for EDR of the radiators (2 pipe system). Does anyone care to comment on my totals? I came up with a total EDR of 993 and DOE of 317000.

I think my current boiler is sized correctly, great! Estimates I've gotten suggest I should go with a Burnham IN11.

Just looking for any thoughts or checking of my work.

Thanks in advance.


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