Two Water Heaters

[Joseph Tribuzio]

Wondering if this venting configuration is OK or if there could be an issue with a larger WH unit upstream of a smaller one? This is in an unfinished attic.

There are other issues there, but im just wondering if the venting is all good

[Larry D. Kage]

No, the venting is not good. The single wall pipe in the attic would be enough to refer it out let alone the lack of supports, eh?

Did you fire them both up and check for backdrafting?

[Marcel R. Cyr]

From what I can see, Ken was telling Smith it was getting hot in there and to take his jacket off, and looks like they both agreed.

[Larry D. Kage]

Originally Posted by mcyr

From what I can see, Ken was telling Smith it was getting hot in there and to take his jacket off, and looks like they both agreed.

LOL

[Joseph Tribuzio]

Originally Posted by lkage

No, the venting is not good. The single wall pipe in the attic would be enough to refer it out let alone the lack of supports, eh?

Did you fire them both up and check for backdrafting?

I didn't fire them up - it was an occupied two flat.
Your right- there already was some other goodies, leaking gas valve, possible asbestos insulated pipes ( could be combined with cloth covered insulation) Not to mention they were not wearing their coats. Both units have that plastic TPS discharge pipe.

The single wall doesn't touch any wood or combustibles though.

I was considering if the set up would allow for back drafting.

[Brian E. Kelly]

Single wall pipes need 6" of clearance. Taped pipes are not acceptable, needs mechanical connections(ie screws). Check for back drafting at the top or the water heater with a mirror(condensation).

Now if you found all that other stuff, they need a specialist anyway.

[Chuck Evans]

Looks like inadequate rise/run for a naturally drafted appliance too.

[Joseph Tribuzio]

Originally Posted by cevans

Looks like inadequate rise/run for a naturally drafted appliance too.

That is kind of what i was thinking but was looking for an echo.

The whole building was full of home owner DIY SHORTCUTS

[Bob Elliott]

Originally Posted by jtribuzio

That is kind of what i was thinking but was looking for an echo.

The whole building was full of home owner DIY SHORTCUTS

That should also be a Y connection Joe.(did someone mention hangers?)

[ldapkus]

The gray panels in the background may be asbestos transite too.

[David A. Andersen]

The main pipe must be equal to the largest connector +50% of the others.

[Darren Spencer]

anyone have the code for rise on exhaust?

[Marcel R. Cyr]

M1803.3 of the IRC


The horizontal vent run

must be pitched down toward the terminal end

1/4” per foot for condensate drainage. The slope applies to the entire length of
the horizontal vent run. Failure to pitch the vent run properly may damage the
heater due to condensate running back into the unit.
Use non-combustible supports on vent pipe. Support lateral runs every six feet
(1.8M). Support vertical runs of Type B double-wall vent pipe in accordance
with the requirements of the pipe manufacturer. Support lateral single-wall pipe
in accordance with accepted industry practices. Do not rely on the heater for

support of either horizontal or vertical vent pipe.

[John Evans]

Were the CO levels checked??

[Bob Elliott]

Originally Posted by jevans

Were the CO levels checked??

Should be, but that does not always show properly and this is in the attic where hopefully one finds circulation.

Needs to be re piped anyway.