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"Ran a little over a gallon" That's not a whole lot of water, considering ambient temp, to cool down. Run it longer and check. If the TPV valve functioned manually, it should do so in practice so I...

Is your plumbing in the attic? I have a 225 ft. well with 150 ft. of poly pipe. My water is so cold, it hits the HW heater pretty good. Not sure how your house is plumbed but sounds like some type...