If you walk around the outside of your unit you will see a metal cover about 18in square with a mesh screen built into it. It will have a small clasp at the top to open the cover downward. This is the back side of the water heater, so where ever that is in relation to the inside of your unit. By the way you will have to empty the hot water heater also by unscrewing the plastic plug at the bottom.
While typing I thought do you have a on demand water heater? if so all I said does not make a difference.
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S.O.B.
Retired and never looked back
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