Switch

I have a new to me 2005 Landmark Golden Gate. Have a switch in the main switch area not sure what it does. It is a lighted red one to the right of the electric hot water heater on switch, same kind of switch. If anyone knows what it is for would be thank full for a post.

This is likely for tank heating pads.

thanks very much---I kinda thought that's what the switch was for but wasn't sure.