Quote:
Originally Posted by NavyLCDR
Inside electric water heater switches are 12v DC. They operate a relay in the control panel of the water heater which energizes when turned on to then supply 120v AC through the outside water heater switch to the thermostat which controls the electric heating element. However, most inside water heater electric switches are lighted to indicate when turned on.
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The pictured panel has a lighted water heater switch. Mine works on 120VAC and or 12VDC/propane. There is a breaker on the main panel as well is the outside rocker switch located at the lower left corner of the heater. Both systems work independently of each other and can work simultaneously.