The temperature-pressure relief valve drain line was reduced and less than 3/4" in diameter. This is a potential safety hazard due to the risk of explosion from restricted flow. A qualified plumber should repair per standard building practices.
Nice narrative Shawn - Only thing is a TPR Valve can be reduced to 1/2" as long as it is reduced at the entrance (as in at the tank). But they can never run uphill.
Watts 1L and 1XL valves are not ASME listed or rated and only usable for 15,000 BTU’s or less, since your typical residential water heater uses 30,000 BTU’s+…well, you get the point.
Well if you have a 3500 or 4500 watt electric water heater (which probably accounts for 90% of water heaters in South Florida) that is the equivalent of
11942 and 15354 btu’s - well, you get the point.