[Half-Inch Stud]

3" Cast Iron Pipes don't appear to have a relief valve,

Well called the Gas Service guy (not heard back) because the gas still stays on too long as the water temp goes to 250Fs ( ridiculous ). Seems the thermo switch is electrically stuck "on" while the thermo-mechanical makes a nice click. I'm going in!

Added a photo, but not gonna wait around to snap it at the peak. Looks like the Delta IV Heavy in there (normal). Update: Snapped a Peak photo; 240F is where it shut off when i re-tuned the Thermo down from 160 to 130F. Me thinkin the Thermo is not close to displayed value anymore. Gonna add that photo