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Old 01-29-2009, 04:59 PM   #1
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Exhaust Condensation


I have a Big Maxx 45000 BTU propane heater in my garage and I used the vertical exhaust kit for venting the exhaust through the roof. My problem is that inbetween runs of the heater, I get condensation that weeps out of the exhaust at the elbow where it comes out of the heater. From the elbow there is a double wall 3" pipe that goes into the attic where a single wall piece goes from it through the roof. What can I do to stop this problem, is there any type of insulation that can be used for that single wall pipe? Thanks for any help and input.

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Old 01-29-2009, 05:55 PM   #2
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Exhaust Condensation


Its possible your flue temp is too cool.
Perhaps its not firing at full rate.

What temp do you keep the garage at.
Many units need a min return air temp.
Or they will condense when they aren't suppose to.

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Old 01-29-2009, 06:34 PM   #3
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Exhaust Condensation


I maintain a 50 degree temp inside the garage and the exhaust seems plenty hot where it comes out of the back of the furnace and the garage is comfortable given it is cold here in Ohio. As I said the double wall goes through the interior ceiling through the thimble and goes up about 2-2 1/2' and the single wall goes about 1' inside before going through the exterior roof and is 2' out above the roof shingles. Thanks for the input.
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Old 01-30-2009, 05:12 AM   #4
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Exhaust Condensation


Flue temps less then 350F, feel very hot. But can cause condensate issues like your having.

How long does the inducer run after the burner shuts down.
May not be a long enough purge for that low of a temp in the garage.
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Old 01-30-2009, 02:46 PM   #5
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Exhaust Condensation


Are you talking about the motor that starts prior to the burner starting? If so, it will run for a couple of minutes and the blower fan runs for about 2 1/2 minutes when the other shuts down before shutting down.
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Old 01-30-2009, 03:36 PM   #6
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Exhaust Condensation


Yes, that is the inducer.
If it shuts down real soon after the burner shuts off.
The residual flue gasses will tend to condense in the flue.
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Old 01-31-2009, 09:56 AM   #7
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Exhaust Condensation


Thanks for the help. I got a new circuit board from Mr Heater and things are working fine now. Now I have one more question and I guess I should start a new post for it. Again, thanks.

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