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If I'm following all of this correctly, the worn/old cartridge is cross flowing cold water into the hot pipe and when the cooled warm water gets to your single handle faucet, well, it's cooler.

Thanks for the fast responses!! I retraced my Sunday plumbing work and solved most of the problem! I the dark and cramped workspace I crossed the flex water lines under my sunken bath tub connecting the two water lines (hot and cold) together. After a few facepalms I correct this and solved...

While diagnosing a low temp and fast depletion of hot water, we noticed that I could turn off the inlet water to the water heater and the double handle hot faucet would show no pressure or flow change, just that the temp got cold. I seem to have full pressure to the hot taps whether the valve...