Vulcan spa and hot tub heaters are integrated with adjustable control thermostats for pre-setting an optimum temperature range and then automtically shutting off when the water temperature reaches up to 100 degrees F, thereby preventing scalding. Selected models feature a flow-through mechanism that uses flow sensors to activate the heater when water flows through them for a continuous water supply. Choose from a wide range of these storage water heaters available in 12.50 & 25 amp current ratings on Raptor Supplies.