Thread: Water heater TPR valve

Does the discharge tube on a TPR valve have to be PVC or copper. I am not sure what type of material this was, almost like garden hose. I could not find a rating.

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Originally Posted by mathew stouffer

I am not sure what type of material this was, almost like garden hose. I could not find a rating.

Not almost like... that is a garden hose. No, it's not rated, and since GE water heaters are exclusive to Home Depot, the whole install is likely DIY.

Dom.

P2803.6.1 Requirements for discharge pipe.

The discharge
piping serving a pressure-relief valve, temperaturerelief
valve or combination valve shall:
13. Be constructed of those materials listed in Section
P2904.5 or materials tested, rated and approved for

such use in accordance with ASME A112.4.1.

TABLE P2904.5
WATER DISTRIBUTION PIPE

MATERIAL STANDARD

Brass pipe ASTM B 43
Chlorinated polyvinyl chloride (CPVC) plastic pipe and tubing ASTM D 2846; ASTM F 441; ASTM F 442; CSA B137.6
Copper or copper-alloy pipe ASTM B 42; ASTM B 302
Copper or copper-alloy tubing (Type K, WK, L, WL, M or WM) ASTM B 75; ASTM B 88; ASTM B 251; ASTM B 447
Cross-linked polyethylene (PEX) plastic tubing ASTM F 877; CSA B137.5
Cross-linked polyethylene/aluminum/cross-linked polyethylene
(PEX-AL-PEX) pipe ASTM F 1281; CSACAN/CSA-B137.10
Cross-linked polyethylene/aluminum/high-density polyethylene
(PEX-AL-HDPE) ASTM F 1986
Galvanized steel pipe ASTM A 53
Polybutylene (PB) plastic pipe and tubing ASTM D 3309; CSA CAN3-B137.8
Polyethylene/aluminum/polyethylene (PE-AL-PE) composite pipe ASTM F 1282
Polypropylene (PP) plastic pipe or tubing ASTM F 2389; CSA B137.11
Stainless steel (Type 304/304L) pipe ASTM A 312; ASTM A 778

Stainless steel (Type 316/316L) pipe ASTM A 312; ASTM A 778

Insulation on the hot pipe is too close to the draft hood.
The flue pipe doesn't look like it's secured to the draft hood.

Originally Posted by mathew stouffer

Does the discharge tube on a TPR valve have to be PVC or copper. I am not sure what type of material this was, almost like garden hose. I could not find a rating.

Just a note in addition to the other information given in the posts above ... "PVC" is not allowed for that use.

I suspect you were meaning "CPVC"?

Originally Posted by John Arnold

Insulation on the hot pipe is too close to the draft hood.
The flue pipe doesn't look like it's secured to the draft hood.

Check G E website for product manual, they allow insulated pipes down to the top of the heater

The garden hose makes it much easier to get that pesky leak outside. Nevermind that the water pressure in the home is over 100 PSI and the heater is set at High. Just a guess.

But the insulation is too close to the single wall vent.

Originally Posted by David Bell

The garden hose makes it much easier to get that pesky leak outside. Nevermind that the water pressure in the home is over 100 PSI and the heater is set at High. Just a guess.

I inspected a home the other day that folks lived in. Both gas water heaters water temp was between 165 and 170

Yes, I turned it down. Told the owners and they thought the water temp should be that high. They stated that many times they were just about scalded almost instantly .

"I inspected a home the other day that folks lived in. Both gas water heaters water temp was between 165 and 170"

You do understand that the "T" in TPR stands for Temperature, and is set at 150 deg.

Originally Posted by Rick Cantrell

"I inspected a home the other day that folks lived in. Both gas water heaters water temp was between 165 and 170"

You do understand that the "T" in TPR stands for Temperature, and is set at 150 deg.

Ahhhh.......really?

I did not write everything I got into with the owners. I just never completed what I was writing and what I went over with them. Got called away and hit send before leaving.