Replace waterheater drain plug ?

[luberhill]

This one looks kinda chewed up,, I checked the hardware and they don’t have a plastic one
Ebay ?? Are they all the same thread ??
Would you put a little silicone grease or plumbers grease on it when threading back in ??

[allen8106]

Lowes or Home Depot will have those plastic threaded fittings.

[Boon_Docker]

I was wondering about that when you said "Except when water heater temp reaches 210*F the pressure will be close to 150 PSI" :S

[Old-Biscuit]

Boon Docker wrote:

Old-Biscuit wrote:

Dutch_12078 wrote:
Schedule 40 CPVC 1/2" plugs are rated for a 200? max at 118 PSI, so I wouldn't be too concerned about one failing at a 210° T&P relief valve rating at the typical 40-50 PSI used in our RV's. I've used them for years when nylon plugs were not readily available without a single failure that I'm aware of.

Except when water heater temp reaches 210*F the pressure will be close to 150 PSI

Both above the temp/press rating of that CPVC.

Just heating the water to 140*F can cause a pressure rise to 110 PSI

Temp/press ratings should NOT be ignored or pushed aside because one has gotten away with it in the past.

Worked around temp/press my whole life, either can injury/maim in just seconds. BOTH will KILL.
Just saying.....

Wow, you must have really strong plumbing in your RV to withstand 150 PSI in the water heater.

NO...it will NOT withstand it

That is why the T&P Relief Valve is on the dang water heater so it can open and relieve the excess temp/pressure caused by failure of t-stats
:S

[Boon_Docker]

Old-Biscuit wrote:

Dutch_12078 wrote:
Schedule 40 CPVC 1/2" plugs are rated for a 200? max at 118 PSI, so I wouldn't be too concerned about one failing at a 210° T&P relief valve rating at the typical 40-50 PSI used in our RV's. I've used them for years when nylon plugs were not readily available without a single failure that I'm aware of.

Except when water heater temp reaches 210*F the pressure will be close to 150 PSI

Both above the temp/press rating of that CPVC.

Just heating the water to 140*F can cause a pressure rise to 110 PSI

Temp/press ratings should NOT be ignored or pushed aside because one has gotten away with it in the past.

Worked around temp/press my whole life, either can injury/maim in just seconds. BOTH will KILL.
Just saying.....

Wow, you must have really strong plumbing in your RV to withstand 150 PSI in the water heater.

[Old-Biscuit]

Suburban ------pre-set at 130*F (Optional 140*F available)

Atwood.........pre-set at 140*F (Optional 130*F available-----also an adjustable 110*F-150*F)

[Lwiddis]

No adjustment on water heaters. Heating the water until the unit cuts off is unnecessary for me most of the time...to shower or do dishes.

[enblethen]

That is correct, no way to adjust. Only thing to do is mix water at faucet.
I have seen an after-market adjustble, but that would reduce the amount of super hot water.

[luberhill]

Are these heaters on a set temp ?? I don’t see any way to chg setting

[Old-Biscuit]

Dutch_12078 wrote:
Schedule 40 CPVC 1/2" plugs are rated for a 200? max at 118 PSI, so I wouldn't be too concerned about one failing at a 210° T&P relief valve rating at the typical 40-50 PSI used in our RV's. I've used them for years when nylon plugs were not readily available without a single failure that I'm aware of.

Except when water heater temp reaches 210*F the pressure will be close to 150 PSI

Both above the temp/press rating of that CPVC.

Just heating the water to 140*F can cause a pressure rise to 110 PSI

Temp/press ratings should NOT be ignored or pushed aside because one has gotten away with it in the past.

Worked around temp/press my whole life, either can injury/maim in just seconds. BOTH will KILL.
Just saying.....

[luberhill]

I used a Snapon crows foot, very easy

[enblethen]

Brand does not matter.
Size of wrench(I use a properly sized socket with extension) maybe different.

[wilber1]

The nylon plugs are available at RV dealers. Cheap, I carry a spare

[luberhill]

Gotcha ! I just went to Walmart they didn’t have them so I’ll order on eBay
Probably doesn’t matter brand right ?

[DrewE]

luberhill wrote:
These are 1/2” ?? They take a 15/16 wrench I know

1/2" NPT is the thread size and structure (1/2" national pipe thread). 15/16" is the wrench size for the hex head. Similarly, a standard 5/16-18 bolt requires a 1/2" wrench; the 5/16" is the thread diameter (and it has 18 threads per inch).