I believe this may be the discharge pipe.
Copper tube attached to water heater draining on floor.
With a drain hose attached open up the drain valve.
Many municipalities require that homeowners install a hot water heater drain pan underneath the water heater.
Take the old valve with you to the home depot to make sure the replacement matches.
We ve been using the heater a great deal in the last 60 days.
If the pressure in the tank exceeds 150 psi or the temperature exceeds 210 degrees fahrenheit the tpr valve opens to release the pressure.
The water is leaking directly onto the basement and there is no drain so it s puddling on the floor.
The amount of leakage filled up a 5 qt pan in 20 30 minutes.
Open the drain valve.
We only noticed it this morning.
Now shut off the water using either the valve in the cold water pipe above the water heater or the main water supply valve to the house.
Slide the nut as far back on the pipe as possible to give yourself room to work.
You may have an issues with the hot water coming out of overflow pipe.
Instead it is attached with a discharge pipe link with hot water heater.
The bottom of the tube is open and you should.
The tpr valve is located on the side of the tank and it should have a copper tube that extends out a few inches and then turns downward to the floor.
Relief valves located inside a building shall be provided with a drain not smaller than the relief valve outlet of galvanized steel hard drawn copper piping and fittings cpvc or listed relief valve drain tube with fittings which will not reduce the internal bore of the pipe or tubing straight lengths as opposed to coils and shall extend from the valve to the outside of the building with the end of the pipe not more than two 2 feet 610 mm nor less than six 6 inches 152 mm.
Begin to install the valve by sliding the compression nut over the supply pipe.
In most of the disasters caused by hot water heater pipe leaking from the top the trp valve is involved.
This temperature pressure relief valve is not directly attach with the hot water pressure heater.
The pipe ran up and over to the outside wall and down into the washer drain.
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The 3 4 pipe had been crimped down to hold the 3 8 tube and soldered in.
Make sure the pressure is off by testing the water faucets in the house turning them on and checking for hot water.
The pop off line was a 3 8od copper tube that had been inserted into a stub of 3 4 copper coming out of the male adapter connected to the t p valve.
The pan prevents the water from spilling onto the floor but contains a drain line so.
Quick lesson on uponor aquapex and copper water supply fittings.
Compression fitting shut off valves attach to rigid copper pipe and are popular options.
I replaced a water heater a couple of weeks ago.