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Posted by John Grabowski on September 6, 2009, 9:00 pm
>I currently have one (NG)water heater in the basement venting into an
> unlined chimney.
> I am adding a second one on the second floor for the hot water needs for
> an upstairs apartment.
> As I understand it the chimney is much to large for the single water
> heater to be venting there.
> I was planning on lining the chimney by running down sections of
> galvanized pipe through the chimney from the roof, then capping off the
> top of the chimney arouond the new vent.
> In my mind I'm using the old chimney as a sort of pipe chase.
> For the section with just one water heater, I'm assuming I just need 3",
> what size should I increase it to after I tee in the second heater vent?
> 4" isn't quite double the area as 3", so would 5" be the correct size?
> Is galvanized ok, or do I need stainless? Class B?
> Besides powered vent water heaters, is there another option I should
> consider?
*I've noticed that in several towns in my area the building inspectors are
requiring that the original 3" vent installed by the builders be changed to
4" when the water heater gets replaced. It might have something to do with
the increase in BTU's, but I am not sure. You should check with your town
regarding your installation. As Bill mentioned fresh air is important for
combustion and draft. I am wondering if the top of the chimney became
clogged with a birds nest or other critter, would the exhaust from the lower
water heater come out into the upper apartment? I guess there is probably
some sort of back draft damper that can be installed.
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> unlined chimney.
> I am adding a second one on the second floor for the hot water needs for
> an upstairs apartment.
> As I understand it the chimney is much to large for the single water
> heater to be venting there.
> I was planning on lining the chimney by running down sections of
> galvanized pipe through the chimney from the roof, then capping off the
> top of the chimney arouond the new vent.
> In my mind I'm using the old chimney as a sort of pipe chase.
> For the section with just one water heater, I'm assuming I just need 3",
> what size should I increase it to after I tee in the second heater vent?
> 4" isn't quite double the area as 3", so would 5" be the correct size?
> Is galvanized ok, or do I need stainless? Class B?
> Besides powered vent water heaters, is there another option I should
> consider?