Patent ID: 6943325

Claim:
A water heater system for use in spas, hot tubs, pools, hydrotherapy pools, and bath tubs, the water heater system comprising: a water heater, the water heater comprising a heating chamber for heating water passing therethrough, the heating chamber comprising at least a portion of a recirculating water flow path and having an inlet, an outlet, and at least one heating surface, the heating surface having an inner wet surface and an outer dry surface, wherein a dielectric layer is coupled to the outer dry surface of the at least one heating surface by a binding material formed on the outer dry surface of the heating chamber, at least one resistor is attached to the dielectric layer, a conductive layer is connected to at least a portion of the at least one resistor, and at least one terminal is connected to at least a portion of the conductive layer; at least one temperature sensor located on or near the water heater for sensing a temperature indicative of a water temperature; an electronic controller having at least one microprocessor adapted to process signals from a plurality of devices providing water parameter information, wherein the electronic controller is connected to the at least one terminal and is arranged to control the operation of and to controllably energize the water heater, wherein the electronic controller is connected to the at least one temperature sensor, and wherein the electronic controller is configured for connection to a power supply and to control power to a pump for moving the water through the recirculating water flow path.