Combustion Test Results


Old 11-10-20, 01:31 PM
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Join Date: Oct 2008
Location: USA
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Combustion Test Results

I'm posting this information as a data point for whatever use the readers wishes to make of it.

This for a 70-year-old Kewanee hot-water boiler. Fire-tube, two pass, natural gas, 168,000 Btu net rating.
Stack temperature - 442 deg F gross, 366 deg net.
8% CO2
20% stack loss
80% boiler efficiency
This boiler is installed on a 3,900 sq ft, two-story, frame house with new windows and average insulation (for 1951)

Calculated heat loss using Slant/Fin Hydronic Explorer, before window replacement: 106,000 Btu/hr (27.2 Btu/ sq ft). Indoor design temp 70 deg F, outdoor design temp -10 deg, design water temp 180 deg.
Old 11-10-20, 02:57 PM
Join Date: Oct 2013
Location: United States
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Received 62 Votes on 58 Posts
I asked a question but deleted it because I realized it was gas and not oil.

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