That's the only switch in the rig for the holding tank heaters. If you have a tankless water heater, the switch for it is on the heater itself. You have to open the outside cover for that switch. The tankless water heater also has a rotary adjustment in the bathroom. There's also a switch in the bathroom labeled Water Pump that does just that.
2015 Greyhawk 29MV
Honda CRV toad with Blue Ox baseplate
Ready Brute Elite towbar with braking system
TST 507 Flowthru TPMS