lyall coburn Posted November 13, 2009 Report Share Posted November 13, 2009 Does anyone know how to find out the efficiency of an UCL furnace model OLG 105/122 ser # 950/100/108 ??? Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted November 13, 2009 Report Share Posted November 13, 2009 Does anyone know how to find out the efficiency of an UCL furnace model OLG 105/122 ser # 950/100/108 ??? On the data plate, compare the input BTU/hr rating to the output BTU/hr rating. - Jim in Oregon Quote Link to comment Share on other sites More sharing options...
Mark P Posted November 13, 2009 Report Share Posted November 13, 2009 Hi Jim, That sure is interesting and I'm surprised I had not leaned that earlier in my life. I was looking at an old furnace the other day (1976), and I was just assuming, based on its age, and the huge flame it produced, it was very inefficient. On the data plate there was the following info: INPUT: 125,000 BTU/HR BONNET CAPACITY: 100,000 BTU / HR MINIMUM INPUT: 87,000 BTU / HR So since 100,000 is 80% of 125,000 then the unit is in fact 80 afue, is that how it works? Quote Link to comment Share on other sites More sharing options...
Bain Posted November 13, 2009 Report Share Posted November 13, 2009 Does anyone know how to find out the efficiency of an UCL furnace model OLG 105/122 ser # 950/100/108 ??? On the data plate, compare the input BTU/hr rating to the output BTU/hr rating. - Jim in Oregon This is also a useful method to make certain some lunkhead didn't connect a PVC flue-pipe to an 80% furnace. Quote Link to comment Share on other sites More sharing options...
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