Hi.
On our 2001 Yellowstone bus there are a few places to check. By the sink you should see a residential looking light switch and the toggle is red plastic. Flick that up/down to see if it illuminates. Next check the water heater itself as mine has an on/off switch on it. But make sure you look for the breaker first... our panel is under the bed and the water heater is on it's own circuit.
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