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  #1  
Old 3/25/10, 10:06 PM
Buck Hartley, CMI's Avatar
Buck Hartley, CMI Buck Hartley, CMI is online now
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Join Date: Nov 2005
Location: Merriam, Kansas
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Default Water heater flue

New HI furnace installed. Water heater connected to the old furnace flue. What are your thoughts about this connection? I know this has been discuss here before, just too lazy to look it up.

Thanks!



Mid America Property Inspections, Inc.
Shawnee, KS 66216
www.mapii.com
NACHI # 05110992
KS-Radon Cert.# KS-MS-0035
KS-Termite Cert. # 18933
M0-Termite Cert. # N 5033


Last edited by bhartley; 10/28/13 at 1:28 PM..
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  #2  
Old 3/25/10, 10:18 PM
James E. Braun, CMI's Avatar
James E. Braun, CMI James E. Braun, CMI is online now
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Location: Jefferson City, MO
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Default Re: Water heater flue

It should draw okay. I really see no problem. Having a bigger than needed flue is not an issue.
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  #3  
Old 3/25/10, 10:21 PM
Buck Hartley, CMI's Avatar
Buck Hartley, CMI Buck Hartley, CMI is online now
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Default Re: Water heater flue

Thanks, James, it is MILLER time. It has been a long day.



Mid America Property Inspections, Inc.
Shawnee, KS 66216
www.mapii.com
NACHI # 05110992
KS-Radon Cert.# KS-MS-0035
KS-Termite Cert. # 18933
M0-Termite Cert. # N 5033

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  #4  
Old 3/26/10, 12:18 PM
Greg Keene, CMI's Avatar
Greg Keene, CMI Greg Keene, CMI is offline
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Join Date: May 2007
Location: Evergreen, CO
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Default Re: Water heater flue

Actually, the larger flue from the furnace could affect the draw from the WH. Going from a 3" flue to a 6" flue can reduce the draw. when the furnace was installed it would help the DWH draw. The only way to tell is to check for spillage that doesn't stop within 60 seconds. BTW, I might be wrong, but this is what I learned trying to get my BPI cert. Any HVAC guys out there to correct one of us?



Greg Keene
Certified Master Inspector
Clear Choice Home Inspections
Evergreen, CO
303-674-3234
greg@clearchoice-hi.com
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  #5  
Old 3/26/10, 12:27 PM
Bob Elliott's Avatar
Bob Elliott Bob Elliott is online now
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Join Date: Aug 2006
Location: Chicago
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Default Re: Water heater flue

Additional Guidelines for Single-Appliance
Vent Systems
The flow area of the vertical vent shall not exceed
seven times the flow area of the appliance flue collar
area or the draft hood outlet area. For instance, if:
The flue collar diameter is: 3" 4" 5" 6" 7" 8"
The maximum common
vent diameter allowed is: 8" 10" 12" 14" 18" 20"
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