Pex connection on a Water Heater

[Marcel Gratton]

Originally Posted by sstanczyk

4. The 18" rule is in effect for all types of water heaters.

Hope this helps.

In Quebec, the 18" rule does not apply if its an electric water heater even though it does in the U.S.

[Stephen W. Stanczyk]

Originally Posted by mgratton

In Quebec, the 18" rule does not apply if its an electric water heater even though it does in the U.S.

This is not a code issue, it is manufacturer's requirement.

[KEVIN WOOD]

In my book it says 180 F.
It also says do not connect directly to a water heater.
Some PEX can only handle 120 psi, so who is wrong?
http://plasticpipe.org/pdf/tn-11_tem...n_pressure.pdf
http://www.healthyheating.com/Page%2...0is%20made.pdf

[Stephen W. Stanczyk]

I checked directly with the largest manufacturer of PEX in the world. The specs I posted were directly from the person in charge of tech support / codes.

I would take their word over a general pipe supplier anytime. The chart you posted was for non-pressure applications but it did show PEX at 210 degrees.

Since I just finished a re-pipe with PEX, I can tell you that there is sure a difference between brands. The interior diameter of Zurn brand (sold at HD) is much smaller than Uponor/Wirsbo and the fittings are sure not interchangeable.

[KEVIN WOOD]

So on the pipe it says 210 F with no pressure. This tells me it cannot be installed directly to the water heater. It reduces to 180 F after pressure is applied. So as a drain pipe it is fine but not as a pressurized hot water line connected to a Hot Water Heater. IMO

[Marcel Gratton]

Originally Posted by sstanczyk

This is not a code issue, it is manufacturer's requirement.

Exactly what I was trying to convey!

[Scott May]

Originally Posted by sstanczyk

Why would you need a dielectric fitting between plastic and galvanized? My question is regarding what looks like a valve at the hot water T. What was that for?

The only reason ask Steve is because the plastic piping (pex) " looks like it attached to copper/brass and then the galv" the picture i just not that clear so therfore a valid point. Dielectric fittings would be necessary if that were the case.

[Stephen W. Stanczyk]

Brass fittings are allowed in place of dielectric unions when joining galvanized to copper. But this is plastic pipe. There is no need for any type of union.

[Joseph W. Keresztury]

Originally Posted by jfunderburk

Per the IRC, PEX is acceptable for the TPR discharge piping.

Thanx for noting that Joe. I thought it wasn't ok either. I guess my assumption was due to everyone here uses CPVC or copper for HW TPRV drain lines.

[Dale Duffy]

Originally Posted by sstanczyk

I checked directly with the largest manufacturer of PEX in the world. The specs I posted were directly from the person in charge of tech support / codes.

I would take their word over a general pipe supplier anytime. The chart you posted was for non-pressure applications but it did show PEX at 210 degrees.

Since I just finished a re-pipe with PEX, I can tell you that there is sure a difference between brands. The interior diameter of Zurn brand (sold at HD) is much smaller than Uponor/Wirsbo and the fittings are sure not interchangeable.

10-4 Steve.....

[John Allingham]

Another question. That doesn't look like a high efficiency water heater. Why do you say it is. Too blurry to read label.