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Old 09-16-2006, 07:12 PM   #1
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Gas Hot Water Heater


I'm putting a gas hot water heater out in the double car garage. Does it need those two cold air vents or is there enough air in the garage? I'm hearing two different things.
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Old 09-16-2006, 07:29 PM   #2
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Gas Hot Water Heater


How many square feet is the garage, how high is the ceiling, and how many BTU's is the water heater? These numbers affect the answer. Also, are you aware of the elevation requirement for gas water heaters installed in garages?
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Old 09-16-2006, 07:59 PM   #3
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Gas Hot Water Heater


The garage is a little over 24 feet across the front (garage door side) and about 22 feet long. The ceiling height is eight feet.

The hot water heater is 50 gallons. I'm not sure of the BTU's. (The house is plumbed for recirculating hot water. I thought I'd throw in this detail, in case it matters.) This is new construction. The plumber won't put the hot water heater in until he tops off. So, I don't have any of the information other than size.

I think the platform for the hot water heater is 18 inches high. It's to code, I'm sure.

I, myself, think the heating and cooling guy forgot to put the vents in. I'm trying to have trust in my subcontractors. Before I get a hold of him, I wanted to have some background knowledge. I don't want to call him if I'm wrong. (I think way tooooo much on every detail.) I see these vents on other gas hot water heaters...
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Old 09-16-2006, 08:10 PM   #4
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Gas Hot Water Heater


The code does not require such vents for gas appliances installed in spaces with at least 50 cubic feet per 1000 BTU's. You have 4224 cubic feet in the garage, so you can accomodate a gas appliance up to 84,000 BTU's. Your typical 50 gallon gas water heater is around 40,000 btu's.

We can quibble about code terms like "ordinary tightness" and "unusual tightness" (with regard to construction type), but we'll just assume that this is the typical garage.

Last edited by mdshunk; 09-16-2006 at 08:13 PM.
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Old 09-16-2006, 08:16 PM   #5
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Gas Hot Water Heater


Yes, it's a typical garage. Open rectangle.

Thank you, thank you for getting back to me!

I think I'll pass on demanding it. If I happen to see him, I'll just ask about it.

Thank you, again!
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Old 09-16-2006, 08:30 PM   #6
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Gas Hot Water Heater


It's a worthy question to ask. Proper functioning of your gas appliances and not getting poisoned by carbon monoxide are both desirable end results.

When you ask, unless there are local amendments, your sub will tell you chapter and verse what I just told you. It's straight out of the code. M1702.1 for reference.
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