Made for use with Suburban SW Series Water Heaters Replacement For. 232259, 233358, 233357, 525001 On/Off switch for Suburban SW Water Heater 110 element. This switch allows you to make sure the element stays off it the water heater does not have water in it, like when it the unit has been winterize. If the Element comes on without water in the tank it will burn out. On/Off switch for Suburban SW Water Heater 110 element. This switch allows you to make sure the element stays off it the water heater does not have water in it, like when it the unit has been winterize. If the Element comes on without water in the tank it will burn out.