Old Magic chef Furnace Efficiency

I have a twenty year old Magic Chef High Efficiency furnace that I'm thinking of replacing. How can I find out what efficiency percentage it is? eg, 80% 90% 92% etc? Thanks for any help! The rating plate for the furnace is usually in the burner compartment. A rough indication of the furnace efficiency can be had by dividing the furnace output by the furnace input. One way of telling is what kind of flue pipe you got coming off of it, if it is metal flue than its probably nothing over 80%. If you have pvc pipe going through your wall rather than a roof than its 90+. Now remember that 20 years ago high effeciency was most likely about 80%. post the model number and I will take a look for my book.. with it can tell you the eff. rating. Originally Posted by cyberdead post the model number and I will take a look for my book.. with it can tell you the eff. rating. It is a Magic Chef UltraII High Efficiency Gas-fired Furnace and the model number is EG6F80DC12-2C. The input is 80,000BTU and the output is 75,000BTU which works out to roughtly .93%...can that be right for a 20 year old furnace? It does have a PVC exhaust going out through the wall. Today we were forced to put an ignition control module on it at a cost of $400.00 just to get heat for the next 6 weeks of the heating season and hate to replace it now if we can get another year or two out of it. Thanks for the help everyone! OK lets see the Magic Chef EGF680DC12 was built for two years.. 1987 and 1988 it is 80,000 btu at 90.3% eff. IF the furnace is not giving you major problems and has a sound heat exchanger I would keep it.. the only reason for a change would be maintenance reasons the efficy. is just fine. You might gain 1% or 2% with a change out. Thanks so much cyberdead. I originally wanted to change this thing out because of reliability problems- I just had to put an ignition module on it, and the contractor saw plenty of potential problems coming soon. Part of it is also that the Canadian Gov't is offering incentives right now to upgrade and I thought they may as well pay part of the price if I was going to replace it anyway. Problem is, you have to replace what you have with something more effiecient to get the grants! The one I'm going to replace it with is slightly more efficient though- 92.10%- so I'm hoping that will be sufficient to get me a little more money back from the gov't. The old may also have compatibility issues with any new A/C unit which is where I REALLY hope to recoup some of my investment. Thanks again, you've put my mind at ease. Originally Posted by cyberdead OK lets see the Magic Chef EGF680DC12 was built for two years.. 1987 and 1988 it is 80,000 btu at 90.3% eff. IF the furnace is not giving you major problems and has a sound heat exchanger I would keep it.. the only reason for a change would be maintenance reasons the efficy. is just fine. You might gain 1% or 2% with a change out.

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