I see what you mean. If the sketch below is correct - I think you will have to pull the water heater out. Even if it is open behind the wet bay - that is quite a long reach over the furnace. I vote "pull it out".
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MikenDebbie Aggie ‘77 in the sticks near Austin TX
2019 Chevy 3500 High Country DRW
2018 Montana 3921FB
Aussie Gus + Texas Heeler Jimmy
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