Chimney height for a hot water heater

Get out your tape measure and follow the code as shown here

National Fuel Gas Code, ANSI Z223.1, Section 10.5.2.1, states the rule: "A chimney for residential-type or low-heat gas utilization equipment shall extend at least 3 ft. (0.9 m) above the highest point where it passes through a roof of a building and at least 2 ft. (0.6 m) higher than any portion of a building within a horizontal distance of 10 ft. (3 m)."

Thank you for answering so quickly, much appreciated.

Note that things like swamp coolers count as "portion of a building" as you don't want the cooler to be able to pull the exhaust from the water heater back into the living space.

Wasn't this radiant heat for a garage? Swamp cooler used at the same time?

Code doesn't care what you happen to have "turned on" at any given time. Point is you are not supposed to have a means of sucking CO back *into* a living space; exhaust from water heater is considered exhaust.

Remedy is a couple of extra feet of height -- nothing that's going to break the bank.

I bought 2 of these DeLonghi oil radiant heaters recently:

or

Are those the kind of heaters you're talking about when you mentioned radiant heat?

No, he is talking gas fired. I'd need 8 of those heaters for my garage in the winter to do what my propane heater does.

I think the OP has a system of in-floor pipes.

Ah... We have some propane heaters we use in our greenhouse.

Eventually, someone will ask. Why do you apply heat to hot water?

- . Christopher A. Young learn more about Jesus .

I had the sense, the OP was installing probably a low mass boiler, for water type radiators.

The electric plug in heaters tend to be

- . Christopher A. Young learn more about Jesus .

The pipes in the floor are supposed to be a very nice way to heat. Gentle heat, and not drafty like fan forced.

- . Christopher A. Young learn more about Jesus .

Maybe, in your case it would be gentile?

O/`

It makes it feel all warm and cozy?

lol

To change its temperature.

I think that the link that you provided is for fireplace chimneys and other types of chimneys (the 2 feet above any portion of the roof or building within 10 feet).

But, the OP appears to be describing a natural gas vent from a natural gas hot water heater -- not a fireplace chimney or other type of chimney.

For Type B ("B-vent") chimneys coming from natural gas appliances, the codes are different regarding height above the roof line. For a Type B chimney with a Type B vent cap, the height above the roof line can be much less than the standard for other types of chimneys (such as fireplace chimneys). One exception is if the Type B chimney vent is within 8 feet of any vertical wall -- which doesn't appear to be the case in the OP's situation.

I think this will be good news for the OP.

Here are some links that I found about Type B chimney vents from natural gas appliances:

file:///C:/Documents%20and%20Settings/Owner/My%20Documents/Downloads/Instructions%20-%20RV%20Gas%20Vent%20-%20USA.pdf