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Old 12-22-2009, 07:46 AM   #1
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does a hotwater tank need chimney

can you vent a water tank out a window and bend up 90 degrees to above the roof with flue pipe? or does it have to go into a chimney? regular natural gas one.


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Old 12-22-2009, 08:09 AM   #2
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You can't go out windows with wood stoves or appliance exhaust
It's possible if you removed the top 1/2 of the window & built a fireproof panel it would be allowed

You would need to check with your local Building Dept


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Old 12-22-2009, 02:07 PM   #3
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�� B vents less than 12” in diameter, terminate 2’ above any vertical surfaces within 8’. (G2427.6.5 #1)
�� B vents with vent caps 12” in size or smaller shall terminate a minimum of 12” from roofs when 6/12 or
flatter. See Tbl. 8-A for other. (G2427.6.5)
�� Vent clearances to combustibles per manufacturer’s listing or performance standards. (M1803.3.4,
M1306.2, G2427.7.7)
�� Single wall vents cannot penetrate a wall, floor or ceiling without a listed pass through assembly.
(M1803.3.1, G2427.7.4)
�� Vent terminations installed per the manufacturer’s listing. (M1804.2.1)
�� Venting systems terminate not less than 4’ below or 4’ horizontally from, and not less than 1’ above a door,
an operable window or a gravity air inlet into a building, nor less than 3’ above any forced air intake within
10’, nor within 12” of grade. (M1804.2.6 & G2427.8 )
�� Vent terminal not mounted directly above or within 3’ horizontally of a gas meter or oil tank. (M1804.2.6)
�� Vent terminal no closer than 3’ to an interior corner formed by (2) perpendicular walls. (M1804.2.6)
�� Power exhaust terminals not located within 10’ of property line and adjacent buildings. (M1804.2.6)
�� Where vents extending into an attic pass through insulated assemblies, an insulation shield of 26 gage
sleeve not less than 2 inches above the insulation, secured in place and maintain required clearances to
combustibles. (G2426.4)
�� Venting supported per manufacturer’s listing. (M1803.3 & G2427.5.7)
�� Vent connector joints are fastened with sheet metal screws or rivets. (M1803.3)
�� Vent and chimney connectors installed within the same space that the appliance is located. (M1803.3)

Check with local B.D. before you close off part of a window or run it outside to " bend up 90 degrees to above the roof ".
Be safe, Gary
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Old 12-22-2009, 03:09 PM   #4
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Becareful of running B vent for too long of a distance outside.

Some water heaters won't produce enough heat quick enough to keep from condensating inside the B vent(usually ones fired around 26,000 BTUs).
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