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Old 06-12-2008, 09:38 AM   #1
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Default PEX and sources of heat

Here's something that might bear mentioning.

Many plumbers (and inspectors) are unaware of the PEX manufacturers' requirement that their pipes not be installed in close proximity to sources of heat. Over time, exposure to high heat will make PEX brittle.

I often see PEX right next to can lights, furnace and water heater flues, fireplace vents, B-wall vents, etc. The manufacturers require 6" of clearance to any source of heat, and the manufacturers' association literature requires 6" horizontal clearance and 12" vertical clearance.

You won't find this in the code. But, inspectors are supposed to enforce manufacturers' requirements as well.

It is usually easy to fix, but who wants the hassle!
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Old 06-17-2008, 10:13 PM   #2
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UPC states 18" from the water heater, so that means the water heater flex, then hard pipe for 18", then pex.
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Old 06-17-2008, 10:32 PM   #3
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Quote:
Originally Posted by WestCoastPlumber View Post
UPC states 18" from the water heater, so that means the water heater flex, then hard pipe for 18", then pex.
How do you figure that it calls for 18" of hard pipe?
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Old 06-17-2008, 10:58 PM   #4
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From Uponor:
Quote:
Recessed Lighting
There are two types of recessed lights: Type I.C. (Insulated Ceiling)
direct contact with thermal insulation and Type Non-I.C. (Non-insulated
Ceiling) 3-inch minimal clearance with thermal insulation.
If there is not enough room in the joist cavity to meet the 12-inch
restriction stated by Wirsbo, then insulation is required.
The insulation must be rated to withstand the temperatures
generated by the fixture.
All tubing that is within 12 inches of the recessed light must be
insulated with closed-cell polyethylene, polyolefin or other suitable
pipe insulation for 12 inches on either side of the light.
Insulation is required anytime a UV light source is used; tubing
must be protected for direct UV exposure.
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Old 06-17-2008, 11:14 PM   #5
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From Uponor again:

Quote:
Do not install AQUAPEX tubing within 6 inches of any gas appliance
vents, with the exception of double-wall B-vents (with a minimum
clearance of 1 inch).
I appreciate the heads up OP, but please be careful about promulgating incorrect information on here. Not saying you were. I just hate to see bad info given out.
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Old 06-17-2008, 11:16 PM   #6
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Quote:
Originally Posted by 22rifle View Post
How do you figure that it calls for 18" of hard pipe?

UPC 604.13.2 WATER HEATER CONNECTIONS

PEX-AL-PEX OR PE-AL-PE tubing shall not be installed within the first 18" of of piping connected tot he water heater.

so, in my book, and inspectors minds, pex needs to be installed min 18" from the water heater, so I run my 18" water flex, then 18" in thge wall, tie in with pex. I use hard pipe to make the connection ridgid, I perfer work that last many years, not a wobbly hack job coming out of the wall.

should have just said 18", rather then the way I put it. I added my personal needs
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Old 06-17-2008, 11:28 PM   #7
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Quote:
Originally Posted by WestCoastPlumber View Post
UPC 604.13.2 WATER HEATER CONNECTIONS

PEX-AL-PEX OR PE-AL-PE tubing shall not be installed within the first 18" of of piping connected tot he water heater.

so, in my book, and inspectors minds, pex needs to be installed min 18" from the water heater, so I run my 18" water flex, then 18" in thge wall, tie in with pex. I use hard pipe to make the connection ridgid, I perfer work that last many years, not a wobbly hack job coming out of the wall.

should have just said 18", rather then the way I put it. I added my personal needs
Thats what mine code tells me also, check it out via code link in my signature,.
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Old 06-17-2008, 11:28 PM   #8
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Also for anyone reading this, the amount of heat is relative. Keep in mind that PEX is rated for PRESSURE application at up to 200 degrees.

I cannot find any reference that PEX actually becomes brittle with exposure to higher heat. It may, but unless the OP can source his claim I tend to be fairly skeptical of such a claim.

Running next to furnace duct is perfectly acceptable and no one should worry about it at all.

Here's what Zurn PEX says:

Quote:
Zurn PEX may be connected directly to
electric water heaters for residential
plumbing applications. Zurn PEX has brass
male and female threaded adapters and
swivel adapters that can be used for this
application.
Zurn PEX must be kept at least 6" away
from the exhaust vent of a gas-fired water
heater. This is easily accomplished by
using flexible water heater connectors.
When the inlet and outlet connections are
well away from the exhaust vent, such
as most heaters with side connections,
Zurn PEX may be connected directly to
the water heater.
Please note that they allow for direct connection to a water heater. No supply connector needed. Uponor has removed all reference to the 18" requirement from their manual. So unless the code requires it, you may be allowed to connect directly to the water heater.
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Old 06-17-2008, 11:33 PM   #9
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Quote:
Originally Posted by WestCoastPlumber View Post
UPC 604.13.2 WATER HEATER CONNECTIONS

PEX-AL-PEX OR PE-AL-PE tubing shall not be installed within the first 18" of of piping connected tot he water heater.

so, in my book, and inspectors minds, pex needs to be installed min 18" from the water heater, so I run my 18" water flex, then 18" in thge wall, tie in with pex. I use hard pipe to make the connection ridgid, I perfer work that last many years, not a wobbly hack job coming out of the wall.

should have just said 18", rather then the way I put it. I added my personal needs
Gotcha.

My PEX stub outs aren't wobbly but each to his own.
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Old 06-17-2008, 11:33 PM   #10
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I believe pex has a requirement that it cannot be exposed to sunlight for more than 6 months as well.But it's too late to look it up so don't kill me here.And I believe that includes indirect light say ,from windows .
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