Gas Water Heater Flue Size?


  #1  
Old 04-14-06, 12:01 PM
J
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Gas Water Heater Flue Size?

Can someone tell me whether a 4" B-type flue is adequate for a 75k BTUH water heater, if the flue has two 45 degree bends, one 60 degree bend, is 25 ft long, and has a horizontal offset of 6 ft?

I found a demo version of a software package, but only accommodates up to 40K BTUH. Any help or direction is appreciated.

Thanks,
Jeff
 
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Old 04-19-06, 09:17 PM
J
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43 views and no replies? tough question, I know. However, I did find my answer at the public library in the National Fire Code NFPA standard 54. Thanks anyway for the forum, a bunch of good questions and answers here.

Jeff
 
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Old 04-20-06, 07:34 AM
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Sorry no one responded.

My reply would have been that the 2 resources for the information are (1) the installation manual for the WH should have specific venting requirements. (2) The National Fuel Gas Code is generally the authority on this issue.
 
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Old 05-12-06, 01:42 PM
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Don't think so

With the 6 ft. horizontal offset it's not a good Idea.
54 degree angles are ok. Where is it located ? in the basement ?
Is there a way to repipe the gas to a location as not to have such a long horizontal run ?

I was a service tech for a propane company's for 20 years.
And did alot of installations of heating units and water heaters.

I know that with Propane and even Nat gas. the vent cant span 6' horizontally.

Hope this helps
 
 

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