Flue for a propane WH

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KD

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Have a propane WH mounted under the house in garage. For the flue, is there a rule as to how many feet horizontal you can go before you go vertical up to the roof? In the horizontal run, do you make it 1/4 inch per foot slope same a sewer line?
 

Redwood

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Sorry I don't give advice on gas...
CO-alarm_gray.JPG
 

Lakee911

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Then why did you even post, Redwood?

Ked, I would make it slope upwards as much as possible. If you don't get enough slope or you have a very long run you may get condensation in that flue which can lead to it rusting out. You can use B-Pipe to get around that as long as you are getting lift to get the gases out. If you're not a draft inducer may be needed, but I'm not sure if you can use these with a WH unless it's a power vented model.
 

Redwood

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Then why did you even post, Redwood?

Ked, I would make it slope upwards as much as possible. If you don't get enough slope or you have a very long run you may get condensation in that flue which can lead to it rusting out. You can use B-Pipe to get around that as long as you are getting lift to get the gases out. If you're not a draft inducer may be needed, but I'm not sure if you can use these with a WH unless it's a power vented model.

The picture above is the best advice I can give a DIYer on a gas installation!
There are many serious ramifications that can occur from misinterpretations of advice. The advice I gave is the only safe advice to give!
 

Spaceman Spiff

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I would read the instructions for the heater. I have seen many different rise / run / elbow combinations in the same brand of heater, or of the same type. It all depends on the manufacturer, design, and how they tested it. Let the manufacturer tell you what is safe for their product.
 

MACPLUMB

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I Would Go With Redwood On This ! !
If You Have To Ask This Question It Shows You Should Be Using A Professional Plumber/hvac Not Trying To Guess Or Ask A Bunch Of
Blind D. I. Y. Who Don't Know Any Thing About The
National Fuel Gas Code Or The Proper Way To Vent Gas
 

KD

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This was seen on a house inspection for a friend. I recommended that an earthquake strap be installed, T and P drain line be run to the soil and that a licensed plumber inspect the WH flue.
 
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