Cold water pipe.
Hotels use a recirculating pump. Hot water is always flowing from the hot water heater around a loop of pipe that goes past the bathroom in the hotel room.
CPVC is better suited for hot water
I would use hot water conn. on it. Both on cold and hot
To remove a dead critter from the vent pipe of your hot water heater, first, ensure the heater is turned off for safety. Use a flashlight to locate the critter, then carefully use a pair of long tongs or a grabber tool to extract it. If the critter is not easily accessible, consider using a vacuum with a hose attachment to suction it out. Finally, clean the area thoroughly to eliminate any odors and prevent further issues.
The water that is piped in from the city or from your well goes through your water heater and then into the hot water pipes.
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It is copper oxidation.
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There is no vent pipe on top of a hot water heater. Mobile home or not. You must be thinking of something else. The HW tank is only vented by a Pressure Relief Valve vented to the drain.
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