heat loss calculation and chosing a boiler


Old 11-16-08, 10:34 AM
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heat loss calculation and chosing a boiler

After calculating the heat loss, what is that number matched up with that up with on the boiler ratings?

Is it the DOE Heating Capacity, net IBR net rating or input mbh?
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Old 11-16-08, 01:19 PM
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The answer depends somewhat on the fuel type, heating system type, potential overestimate of the heat loss (typically 10-30%) and other factors, but in general, the DOE heating capacity will do.
Old 11-16-08, 03:52 PM
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Agreed DOE output. Been using that for about 15 years and have never had a problem.
xiphias I didn't see you around here for awhile or maybe I just missed your posts.
Old 11-16-08, 05:28 PM
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It seems that often enough the true heatload is only 2/3rds of the calculated heatloss. Personally, of the gross output would be well within my comfort level as a guess. AJHs might disagree. Around here for those of us who actually do pull a permit, IBR must equal or exceed the calculated heat loss which is nuts.

My calculated heatloss was 56 MBH. At design day temps my boiler doesn't hit 40 MBH and that's gross input at the meter.
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