TPR Valve on Cold water pipe

[lewens (Larry Ewens, C.M.R.I.C.)]

There it was on an old electric water heater. The cold water entered from the bottom of the tank and the TPR valve was about half way up the tank on the cold water pipe. Seems to me that this is rather a useless place to put a TPR valve. What say the plumbing gurus.
Larry

[jwilliams4 (Jae Williams)]

@lewens

There it was on an old electric water heater. The cold water entered from the bottom of the tank and the TPR valve was about half way up the tank on the cold water pipe. Seems to me that this is rather a useless place to put a TPR valve. What say the plumbing gurus.
Larry

Temperature ain’t gonna reach the “pop-off” stage…it belongs on the hot water side. The tank is usually equipped with fittings for the TPR on the top and the side–both into the hot water.

[badair (Barry Adair, EIFSTX#39)]

Could it have been a pressure only relief valve?
Was there a TNPV, also?
http://www.watts.com/pro/_products_sub.asp?catId=64&parCat=293

[rcooke (Roy D. Cooke, Sr)]

@lewens

There it was on an old electric water heater. The cold water entered from the bottom of the tank and the TPR valve was about half way up the tank on the cold water pipe. Seems to me that this is rather a useless place to put a TPR valve. What say the plumbing gurus.
Larry

I have seen where they have put tr valves on the cold water years ago but never TPRs .
The difference is the tr does not have the little leaver to test the valve for hard water build up ,
Jae is correct the TPR must be installed on the hot water out let.
Regardless it should be written up as incorrect.

Roy Cooke

[tneumann]

Know what I mean?..

[mnelson1 (Mike Nelson)]

I recently came across a system where the whole system was protected by a tpr valve placed outside, it came with an auto shutoff for the gas at the unit, strange but kinda cool.

[mlarson (Michael Larson, WI Lic. # 1672-106)]

@mnelson1

I recently came across a system where the whole system was protected by a tpr valve placed outside, it came with an auto shutoff for the gas at the unit, strange but kinda cool.

Hi Mike,

You keep tantalizing us with descriptions but no pictures.
Sure would like to see what you are describing.

[badair (Barry Adair, EIFSTX#39)]

@mlarson

Hi Mike,

You keep tantalizing us with descriptions but no pictures.
Sure would like to see what you are describing.

Sounds like a WAGS http://www.wagsvalve.com/

[mlarson (Michael Larson, WI Lic. # 1672-106)]

Thanks Barry. I haven’t seen one of these before.

[bkelly2 (Brian Kelly, AZ Cert. # 60234)]

**Pre

**ssure & Temperature-Relief Line **

• Terminate outside 6in.-24in. from ground point down [608.5] [3408.5.2]
• 3/4in. min., no trap, no reduction, no thread on end [608.5] [3408.5.4.1]
• If Watts 210 valve is used, pressure-relief valve to be installed [manu.] [3408.5.5]

http://www.masterplumber.com/Laws/watts210.gif

When a water heater is below grade, a Watts 210-style- temperature relief gas shutoff may be used in lieu of the required integral temperature and pressure-relief valve so long as it is installed in conjunction with an approved pressure relief device that relieves outside the building. As with any “approved” device, these must be installed to manufacturer’s specifications.

Watts 210 valve perhaps?**

[mnelson1 (Mike Nelson)]

yeah, yeah, that’s the ticket!!

[mnelson1 (Mike Nelson)]

yeah, yeah, that’s the ticket!!