Usually there is a shut off valve right above the water heater on the cold side. There can be one on the hot side to so that the heater can be removed without having to drain the system.
primary flow
Cold feed
Cold feed
primary flow
primary return
Appliance service valve
The isolation valve should (must) be placed on the cold water side (and/or the return side), entering the water heater. Placing the isolation valve on the hot or outlet side of the water heater has the potential of creating a bomb.
Should be right behind the drivers seat in the storage compartment.
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it should be 5 feet
immediately above the stop valve