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Old 12-08-2012, 09:50 PM   #46
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Replace or repair?


I guess I thought there was one heat exchanger. A main and a secondary.
So I'm assuming I have one exchanger with 5 burner jets.

I'm getting some water building up under the exhaust blower fan casing.
I've replaced the rubber coupling and that has slowed the leak. Then we
Tried a bead of silicone on the seam of the casing. There are NO gaskets from
The housing to the blower casing. It is now a silicone gasket.

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Old 12-08-2012, 10:24 PM   #47
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Replace or repair?


Carriers have seperate cells/heat exchangers and usually 4 or more. All the Tempstar/ICPs that I have seen only have 1 big heat exchanger and not seperate cells but I could be wrong. Sounds like your contractor is confused and thinking of Carriers. We change a whole heat exchanger for around $1000 and he probably is quoting you the Carrier price per cell and once he realizes his mistake will walk away from the job or apologize and want more $$.
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Old 12-09-2012, 10:36 AM   #48
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Thanks Yuri

To my thinking, there is no relationship between the actual cost to produce a heat exchanger cell, and the price that they charge for them. They are simply two pieces of sheet metal that are mirror stamped and crimped together at their edges. It is pretty obvious that they want you to throw your old furnace away and buy a new one.

This would represent an incredible market for a creative entrepreneur, if there were not a large number of different types. I dont know, but you might, since you have probably seen many different makes.

I have noticed that some of the newer model furnaces use what looks like flexible exhaust pipe. I guess in an effort toward simplification.
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Old 12-09-2012, 11:01 AM   #49
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Every single heat exchanger is different due to the different firing rates, design temps, etc etc and for liability reasons NOBODY would want to produce them aftermarket. Everything in a furnace has to be UL tetsed for yrs plus CGA gas code etc approved B4 it hits the market.
Flex pipe? what you talkin about?
All venting in Canada must be done with 636 Grade PVC. Google that for more info.
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Old 12-09-2012, 01:55 PM   #50
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Thanks Yuri, I guess that's why they cost so much. You are paying for the testing, approvals etc. etc. Not flex pipe. SOme of the new heat exchangers look like auto exhaust pipe, bent in an S shape in some cases. What I am saying is that they aren't two halves, edge crimped together, and joined in the middle with eyelets.

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