Cold water comes in at the bottom and hot water comes out of the top of the heater.
Rv hot water heater check valve replacement.
If you do know have your new rv water heater anode on hand before starting.
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But to be safe it might be wise to reinstall one when you get a chance.
You may need to remove a cover to access it.
If your rv has a bypass valve these two pipes will be connected directly to each other using a third pipe.
As long as you flush the water heater out once or twice a year this too shouldn t be a problem.
Now go into your rv and find the heater from the inside.