Does A Hotwater Tank Need Chimney - HVAC - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC


Thread Tools Display Modes
Old 12-22-2009, 08:46 AM   #1
Join Date: Jul 2008
Posts: 233
Rewards Points: 150

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.


drewhart is offline   Reply With Quote
Old 12-22-2009, 09:09 AM   #2
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000

does a hotwater tank need chimney

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


Scuba_Dave is offline   Reply With Quote
Old 12-22-2009, 03:07 PM   #3
Registered User
Join Date: Mar 2009
Posts: 10,825
Rewards Points: 3,716

does a hotwater tank need chimney

�� 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
If any ads are present below my answer or words underlined/colored, I do not condone/support/use the product or services listed/linked to, they are there without my consent.
WELCOME to the forums, if I forgot to say it!
Gary in WA is offline   Reply With Quote
Old 12-22-2009, 04:09 PM   #4
An old Tradesmen
Join Date: Oct 2008
Location: Somewhere
Posts: 30,021
Rewards Points: 11,514

does a hotwater tank need chimney

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).
beenthere is online now   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
gas hot water tank vent & chimney flue trees HVAC 11 10-16-2009 10:23 AM
Can't get water from Hotwater tank drain. merle Plumbing 9 03-14-2009 10:42 AM
Toilet jpark Plumbing 18 01-05-2009 08:12 AM
Nightmare water tank job Marvin Gardens Plumbing 6 11-04-2008 12:09 PM
Looks like leaking around the chimney - roofer says it is the chimney itself Salvatorparadise Roofing/Siding 6 03-07-2008 04:12 PM

Top of Page | View New Posts