flue pipe size for venting water heater

From: "bill allemann" <custom4173@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 27 Aug 2007 17:02:33 -0500

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.

.

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Re: flue pipe size for venting water heater
... 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. ...
(alt.home.repair)
Re: flue pipe size for venting water heater
... 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. ... we can't use a 3" vent if the water heater is the only ...
(alt.home.repair)