gas water heater vent question

weaseOctober 18, 2010

Hi all.

I want to move the vent for my gas water heater through the side of the house. The vent used to go through the ceiling, but we moved some things around and now it needs to go sideways.

The run is about 10 feet straight out the side. Easy access. Wondering if I need type B piping and how I run it through the ledger and terminate it. Thanks.

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pelican

Unless the water heater is made for a horizontal sidewall termination, it cannot be done. You might be able to put a vertical chimney outside and connect to it though. Call a gas tech or a plumber. If you do it wrong the thing might not vent properly, filling your house with CO.

    Bookmark   October 18, 2010 at 11:01PM
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wease

I thought there had to be a certain amount of rise for every run in the pipe to make it work. Are you saying you can't run any pipe sideways (at a slight angle up)?

    Bookmark   October 19, 2010 at 9:02AM
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tim45z10

You can, however I do not know the ratio.

    Bookmark   October 20, 2010 at 2:17AM
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alan_s_thefirst

Your best bet is to consider changing over to a PowerVent-type HW heater, they are vented out through the wall using PVC pipe.

If you have a furnace (I'm assuming not) and were to keep using the B-vent, it would probably need to be sleeved or reduced in diameter, since it'll be carrying less exhaust. If you don't, you will have condensation issues.

If you can't get clear written directions on the regulations and how do install, consult a pro - you could easily gas yourself.

    Bookmark   October 20, 2010 at 2:59AM
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wease

All I want to do it take a 90 degree pipe of the top of the gas wh and run a pipe about 10 feet sideways and out of the side of the house. I could have a rise of a foot over that 10 feet if I need to.

If that's acceptable, how do you run it through the side of the house and terminate it?

    Bookmark   October 20, 2010 at 10:08AM
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pelican

These are the rules in my Ontario:

8.14.2
Except for a special venting system with positive vent pressure, a vent shall extend not less than 2 ft
(600 mm) above the highest point where it passes through a flat roof of a building and not less than 2 ft
(600 mm) higher than any portion of a building within a horizontal distance of 10 ft (3 m).

8.14.4
A chimney shall extend not less than 3 ft (900 mm) above the highest point where it passes through the
roof of a building and not less than 2 ft (600 mm) higher than any portion of a building within a
horizontal distance of 10 ft (3 m).

8.14.5
Except for a special venting system with positive vent pressure, a vent passing through a pitched roof
shall extend above the highest point where it passes through a roof surface in accordance with Figure 8.1
and shall extend not less than 2 ft (600 mm) above any other obstruction within a horizontal distance of
10 ft (3 m).

8.14.6
A vent or chimney shall extend not less than 5 ft (1.5 m) in height above either the highest connected
appliance draft-hood outlet or flue collar except as provided in Clause 8.24.1.

8.14.12
A vent from an appliance shall not extend through an exterior wall and terminate adjacent to the exterior
wall unless
(a) the appliance is a direct-vent appliance;
(b) the appliance is intended for connection to a special venting system;
(c) the appliance and its complete vent assembly are specifically certified to be installed in this manner;
(d) the venting system is equipped with a certified power venter that complies with Clause 8.29.2; or
(e) the venting system is equipped with a certified power venter that complies with Clause 8.24.2.

Please get a qualified installer to find a remedy for you.

    Bookmark   October 20, 2010 at 6:50PM
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artemis78

We just did this with a 12-year-old gas water heater, so it can definitely be done. You should check your local code for the specifics, though; they vary. In our city, it just had to meet the proper ratio of horizontal and vertical rise. Ours goes through the wall and up the side of the house, terminating just above the roof line. We hired a local HVAC firm to do the work, though, which was well worth it. Took them half a day. Would have taken me that long just to research how to do it properly!

    Bookmark   October 21, 2010 at 8:27PM
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pelican

Exactly. Terminate above the roofline. The OP wants to terminate out the sidewall, which likely cannot be done. Let us know what you did to resolve this.

    Bookmark   October 22, 2010 at 7:57AM
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