Our Holiday Rambler had two "extra switches" in the bathroom. One was for the gas water heater control and the other was for the water pump. I've not seen tank heater switches installed in the bathroom before (there's a first for everything) as usually they are on the main control panel.
You might, next time you've got the basement unloaded, pull the rear wall and do some "wire tracing" based on the color of the wires that connect to those two switches.
When you find out for sure, post the results, sooner or later someone else will ask the same question and the answer will be available.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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