Boiler Rating Question


  #1  
Old 10-30-08, 07:45 AM
G
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Boiler Rating Question

I have a Kewanee hot-water, gas-fired boiler from the early 1950s. The nameplate says: "Net Rating 168,000 Btu/hr."

Does this mean the fuel input times the expected boiler efficiency? In other words, the actual heat supplied to the house?

I've already determined that the boiler efficiency is about 81%, based on flue-gas analysis. Once it gets colder, and I get longer run times, I'm intending to use the utility's meter to determine the actual fuel input rate.

The gas burner's nameplate lists its input as 210,000 Btu/hr min, and 260,000 max.

My heat-loss calculation for the house comes up with 106,000 Btu/hr.

I'm trying to rationalize all these numbers and figure out exactly what I've got.
Doug
 
  #2  
Old 10-30-08, 04:45 PM
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Forget what you have and replace it. It is 100% oversized. Alot of wasted fuel. Do a heat loss and match that to the DOE Output of the new boiler. Cut your fuel bill 50%.
 
 

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