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Old 06-22-2011, 11:55 PM   #16
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Water heater in closet


Alright, according to my tables of you have a total of 109k btu then you'll need an opening of 18" square or 5" round duct equivalent (if you bring the air in from outside)

Andy G brings up a good point about checking with your local AHJ (Authority Having Jurisdiction or local inspection office). I'm using the Canadian Gas Assoc codebook which is the same codes as the AGA, but these are just MINIMUM guidelines, and your local codes may be more strict. They may want you to have your tank mounted on a platform in case of a major leak, they may want you to chage the way your T&P relief piping is piped (it goes out through the wall to the outside I assume? If so how high above the ground is it?)

It may be a PITA to ask the local inspectors, but it's a gas appliance your dealing with, not electric, so it's better to be safe than sorry.

Thanks for the exercise. I've been working exclusively on Industrial/ Commercial these last few years and this was a good little one to sink my teeth into.

Good luck!

P.S. -
Code:
...this room when done will be either bedroom or bonus room.
Sorry to burst your bubble but the code states that "The water heater, unless of the direct vent type, shall not be installed in a bathroom, bedroom, or any enclosure where sleeping accomodation is provided"

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Old 06-23-2011, 04:26 PM   #17
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Water heater in closet


Thanks for the feedback! Could I close the closet up with an air tight door and opened the attic with vents? That way it's only pulling air from outside the room in question.
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Old 06-23-2011, 08:29 PM   #18
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So then this room is not on an outside wall? Bummer. You can't pull air from the attic, I'll look up the code and add later. There's a max distance you can vent from the outside, I'll look that up later as well.

But the easiest way would be to add a grill on the door, or on the wall. The furnace can't all that noisy, can it? What do you plan on doing in this 'bonus room'?
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Old 06-24-2011, 12:07 PM   #19
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Water heater in closet


The closet, which houses the HWT, does not back to an exterior wall. There are two exterior walls on other side of room. The grills(in door or wall) are an option but not ideal because we would like this room to be available as a bedroom.
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Old 06-24-2011, 12:23 PM   #20
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So this is a direct vent HWT? It didn't look like it to me from your pic, and if it isn't, then is against code. See an earlier post.
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Old 06-24-2011, 12:35 PM   #21
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No, it's not direct vent...and I understand that as it sits it may be against code. I am trying to find a way to bring to code without buying a new direct vent HWT.
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Old 06-24-2011, 12:40 PM   #22
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Water heater in closet


HWT ???
Is that "Hot Water Tank" ?
Is that what that means?
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Old 06-24-2011, 12:49 PM   #23
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Yup, it's easier. Damn now that you've cracked our code, we'll have to change it again.
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Old 06-24-2011, 12:58 PM   #24
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For all these years I have always referred to such appliances as Hot Water Heaters. All the plans and drawings that I can recall have used H.W.H. to the best of my recall. What happens when one is referring to an on-demand heater and there is no tank? Then what?
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Old 06-24-2011, 05:46 PM   #25
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Just curious...why would attic or crawl space air not be considered "outside air" per code?
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Old 06-24-2011, 07:14 PM   #26
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Not knowing where you are from this may not pertain. Around here, Nebraska, it is okay to take combustion air from the attic. You would need 2 pipes. Both extended above insulation in the attic. One would terminate 1 foot from ceiling the other 1 foot from the floor. If your furnace is bringing in its combustion air from outside then you would only need to supply it for the water heater.
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Old 06-24-2011, 07:24 PM   #27
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And you are not referring to a direct vent water heater? How big for the pipes?
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Old 06-24-2011, 07:43 PM   #28
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Quote:
Originally Posted by JRP_24
And you are not referring to a direct vent water heater? How big for the pipes?
You would need to check your local codes.
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Old 06-24-2011, 07:54 PM   #29
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Ok, will check them if I go this route, but, can you confirm you do this type of venting in Nebraska for natural draft hot water heaters?
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Old 06-24-2011, 09:14 PM   #30
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Code says that "... the duct shall communicate directly with the outdoors, ..."
I'd interpret that to mean outside, not in an attic. Maybe your local inspector would see it differently.

PHP Code:
 Around hereNebraskait is okay to take combustion air from the attic
I've never seen a duct terminate in an attic, and I've been in a few, but I guess they do things differently in Nebraska. I wonder why?

Quote:
Just curious...why would attic or crawl space air not be considered "outside air" per code?
Probably due to the fact that either space may not provide enough air for proper combustion.

Quote:
What happens when one is referring to an on-demand heater and there is no tank? Then what?
Maybe ODHTKLS?


Last edited by VIPlumber; 06-24-2011 at 09:24 PM.
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