I haven't noticed the valve relieving water when climbing mountains during the summer but then I typically don't stop to check. It doesn't seem unreasonable that it would blow off excess pressure. I know that the water coming out of the hot faucets after a long hot run seems every bit as hot as the water from the Insta-Hot.
I know from recent experience that a pressure up around 90 psi will cause my Raritan 75 psi valve to open. I certainly enjoy the free hot water courtesy of the engine coolant heat exchanger on the Raritan but they are pricey.
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