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  #1  
Old 12/24/06, 3:39 AM
Donald Peterson's Avatar
Donald Peterson Donald Peterson is offline
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Default Direct vent WH with draft hood

Can a WH with a draft hood be used as a direct vent?
I am under the impression with, direct vented WH, that the intake and exhaust must be with in the same air pressure zone. That would means the intake and exhaust must be on the outside.
The inspection I did had a new gas water heater from HD. I believe that the homeowner replaced it, with a non direct vent rated water heater.



Don Peterson, CMI
AmeriDream Home Inspections Inc.
NYS License: 16000014560
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Old 12/24/06, 9:05 AM
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David P. Valley David P. Valley is offline
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Default Re: Direct vent WH with draft hood

A direct vent water heater should not have a draft hood.

Here's an installation manual from State...
Attachment 7929

Last edited by dvalley; 10/7/07 at 4:42 PM..
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  #3  
Old 12/24/06, 11:09 AM
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Joseph Hagarty, CMI Joseph Hagarty, CMI is offline
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Default Re: Direct vent WH with draft hood

Which Manufacturer of water Heater ?

Bradford White specs......

http://www.bradfordwhite.com/specmanparts_res_gas.asp



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Old 12/24/06, 11:12 AM
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Default Re: Direct vent WH with draft hood

Typical Direct Vent installation

http://intexinspections.com/dvti.png

Here's a image for your reference files -
Harvested and edited from the pdf file listed above
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Old 12/24/06, 11:56 AM
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Default Re: Direct vent WH with draft hood

Quote:
Originally Posted by dpeterson
Can a WH with a draft hood be used as a direct vent?
I am under the impression with, direct vented WH, that the intake and exhaust must be with in the same air pressure zone. That would means the intake and exhaust must be on the outside.
The inspection I did had a new gas water heater from HD. I believe that the homeowner replaced it, with a non direct vent rated water heater.

Did the "homeowner" replace it or was this done by a pro?
I hope the homeowner did not do it and use the old existing venting system. The MFG install instructions are number 1 here..

The term draft hood to me (is the upsidedown bowl shaped) hood open to the atmosphere. Natural draft is the method. Should that be used for a "direct vent" not per MFG instructions I would think defeats the purpose of the appliance working as intended.
The other posts are very very helpful . I like the Dave Valley "Button"...

Happy Safe Holidays to all...
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Old 12/24/06, 12:28 PM
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Donald Peterson Donald Peterson is offline
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Default Re: Direct vent WH with draft hood

The draft hood is the "upside down bowl"
The HW tank is a GE from Home Depot
It is installed using the old wall vent terminal and only utilizing the center exhaust port to the wall vent terminal. They used Aluminum 4" single wall for the exhaust and blocked off the intake portion of the comb wall vent.



Don Peterson, CMI
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NYS License: 16000014560
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  #7  
Old 12/26/06, 12:59 AM
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Patrick Bolliger Patrick Bolliger is offline
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Default Re: Direct vent WH with draft hood

Quote:
Originally Posted by dpeterson
The draft hood is the "upside down bowl"
The HW tank is a GE from Home Depot
It is installed using the old wall vent terminal and only utilizing the center exhaust port to the wall vent terminal. They used Aluminum 4" single wall for the exhaust and blocked off the intake portion of the comb wall vent.



I would call it out and recommend a "qualified professional" to evaluate that. Probably just cost the warranty and created an unsafe install in my opinion. Nothing like defeating the purpose of a direct vent appliance and altering the performance characteristics. So where is this thing getting combustion air from? The Draft hood???
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  #8  
Old 12/30/06, 2:41 PM
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Michael Larson Michael Larson is online now
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Default Re: Direct vent WH with draft hood

Quote:
Originally Posted by dvalley
A direct vent water heater should not have a draft hood.

Here's an installation manual from State...
Attachment 7929
David, no dig intended but apparently that's not alway the case. This is a Richmond mfg. by Rheem.

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  #9  
Old 12/30/06, 3:04 PM
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David P. Valley David P. Valley is offline
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Default Re: Direct vent WH with draft hood

Quote:
Originally Posted by mlarson
David, no dig intended but apparently that's not alway the case. This is a Richmond mfg. by Rheem.

Attachment 8049Attachment 8048Attachment 8047
Hmmmmm....I've never seen one in my area.
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  #10  
Old 12/30/06, 3:35 PM
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Michael Larson Michael Larson is online now
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Default Re: Direct vent WH with draft hood

Quote:
Originally Posted by dvalley
Hmmmmm....I've never seen one in my area.
Well now you have.

This is actually my own water heater. I had a Propane fired one and when Natural Gas became available in my area it was cheaper to buy a new water heater than convert the one I had. The propane one did not have a draft hood but it was a different brand. Your post made me go look at mine and take the picture.
One of my favorite things about being an HI is there always seems to be something new or something I didn't know about before.
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