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I've been discussing this in a thread about my HVAC system because my water heater is next to my air handler. I've decided to move the discussion over here.
Whoever installed the original water heater decided to reduce to 1/4" copper instead of keeping it at 3/4" so it looks like this:

I will need to get more photos. IIRC this water heater was installed in 2001. It has never been drained and has never had the anode rod checked. Given how much hard water we have and how the water comes out brownish, I fully expect that the rod is gone by now.
Anyway, I'm trying to come up with a solution for correcting the T&P valve situation.
I purchased this 63" tube specifically for t&p valves. https://www.homedepot.com/p/Everbil...ene-Side-Mount-Runoff-Tube-EB11955C/204834492
The problem is, my water heater is on a platform in a closet above the air circulation compartment for the HVAC.
Here's a crappy sketch I drew:

ignore the 21x21. It's 20x20 and 1" thick but my brain translated that to 21". herp derp.
This is a cruddy photo that shows a little bit of the platform on the left (where the plywood is).

That is a very old photo. I'd take a more recent one but the carpet is embarrassingly filthy.
The water heater is not on any sort of pan to catch water. The house is a one story ranch up on blocks. Underneath the air circulation compartment is the underside of the house which is just dirt.
The 63" tube is not long enough to reach the underside of the house, so I'm wondering if I can bridge the tube to PEX and then run the PEX out under the house or have it come out near where the condensate line comes out. Another idea would be to have a small floor drain in the compartment below the tube and have sch40 pvc drain pipe going under the house. If it ever leaks it shouldn't be enough to cause any problems. The condensate line already drips under there. I'd eventually like to get something like this: https://www.amazon.com/Tough-87093-Heater-Adapter-Diameter/dp/B016E4TWZY
It will hold the water heater out of the water if there is ever a leak and it will raise it up a little more so its easier to get a hose on to drain it.
As a complete aside, I was looking at new water heaters (in case mine craps out soon) and saw the video ad for Rheem Gladiator and the music is so over-dramatic it's funny.
Whoever installed the original water heater decided to reduce to 1/4" copper instead of keeping it at 3/4" so it looks like this:

I will need to get more photos. IIRC this water heater was installed in 2001. It has never been drained and has never had the anode rod checked. Given how much hard water we have and how the water comes out brownish, I fully expect that the rod is gone by now.
Anyway, I'm trying to come up with a solution for correcting the T&P valve situation.
I purchased this 63" tube specifically for t&p valves. https://www.homedepot.com/p/Everbil...ene-Side-Mount-Runoff-Tube-EB11955C/204834492
The problem is, my water heater is on a platform in a closet above the air circulation compartment for the HVAC.
Here's a crappy sketch I drew:

ignore the 21x21. It's 20x20 and 1" thick but my brain translated that to 21". herp derp.
This is a cruddy photo that shows a little bit of the platform on the left (where the plywood is).

That is a very old photo. I'd take a more recent one but the carpet is embarrassingly filthy.
The water heater is not on any sort of pan to catch water. The house is a one story ranch up on blocks. Underneath the air circulation compartment is the underside of the house which is just dirt.
The 63" tube is not long enough to reach the underside of the house, so I'm wondering if I can bridge the tube to PEX and then run the PEX out under the house or have it come out near where the condensate line comes out. Another idea would be to have a small floor drain in the compartment below the tube and have sch40 pvc drain pipe going under the house. If it ever leaks it shouldn't be enough to cause any problems. The condensate line already drips under there. I'd eventually like to get something like this: https://www.amazon.com/Tough-87093-Heater-Adapter-Diameter/dp/B016E4TWZY
It will hold the water heater out of the water if there is ever a leak and it will raise it up a little more so its easier to get a hose on to drain it.
As a complete aside, I was looking at new water heaters (in case mine craps out soon) and saw the video ad for Rheem Gladiator and the music is so over-dramatic it's funny.