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One reason you do not want to run uphill from the temp-pressure relief'valve is that released water can dribble back down and contribute to corrosion or other failure of the temp-pressure relief valve. Then, when it needs to release pressure, it might be unable to and lead to an explosion of the...

I would not run the tube up from the pressure relief valve. Water could run back into the tube and corrode the pressure relief valve and prevent it from opening. A catastrophic water heater explosion could occur.