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Posted by Big_Jake on August 27, 2007, 8:55 pm
> bill allemann wrote:
> > On common natural draft NG water heaters, I usually see 4" vent pipe, but I
> > was looking at specs on a 40gal unit on the Ruun web site, and the chart
> > shows 3" for residential sizes up to 60 gallons. Somewhere else I was
> > reading that it is not a good idea to have oversize flue vents on gas
> > appliances. I can see where oversize vents would also be an energy waster.
> > Are a lot of people installing vents that are too large?
> > Anyone know of a good reference for sizing vents.
>
> Often, it comes down to what the local
> inspection requirements are. Some cities
> won't permit 3" vent.
>
> The draft hood bypasses most of the air
> around the heater in standby mode so I
> doubt that losses are significantly
> different for 3" or 4".
>
> Jim
Locally, we can't use a 3" vent if the water heater is the only
appliance on the chimney.
JK
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