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Old 12-10-2011, 12:35 PM   #1
2 Rivet Member
1991 34' Excella
Boerne , Texas
Join Date: May 2010
Posts: 81
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Furnace Surface Area - Scrub Buds

I'm toying with the idea of pushing copper scrub buds between the furnace baffels to increase the surface area of heat transfer. I'm trying to make a better heat exchanger out of it. I'm thinking that the scrub buds will also reduce the airflow between the baffels which could be counter productive or helpful? Has anyone attempted to improve the efficiency of the furnace.

My heat bump is about 60-65 F through the furnace and the exhaust air outside is about 320F. Isn't there a way to capture some of the wasted BTU's?
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James B.
1991 34' excella 1000, bought 05/10, oak floors, granite countertops, Marble bathroom counter and floor, 2 A/C's, 2005 Hensley.
Tow With: 2006 Dodge 2500 Quad Longbox 2WD, 5.9 Cummins, Edge Insight CTS, Smarty Jr programmer, Bilstein Shocks, Ingalls balljoints.
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Old 12-10-2011, 03:44 PM   #2
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1981 31' Excella II
New Market , Alabama
Join Date: Sep 2011
Posts: 5,280
These furnances are pretty darn efficient as they are. I expect they are in the 90% range. The air temp maybe hotter but the flow will be less so it is a wash. You really don't want to introduce thermal gradients that might lead to cracking. A gas furnance is much more efficient than electric/heat pump versions. Filling your own gas bottles will save you much more. A 40lb tank costs me $30 to fill. The gas is worth about half that.

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