Patent ID: 6590188
Filing Date: 2003-07-08
Classification: A61H,F24H,H02H

Abstract:
In a pool or spa, including an electronic controller, a heater assembly connected in a water flow path for heating water passing there through, a method for heating water for bathers, comprising:sensing an inlet water temperature at a first location in the flow path adjacent a first water port of the heater assembly; sensing an outlet water temperature at a second location in the flow path adjacent a second water port of the heater assembly; determining whether a body of water is present in the flow path within the heater assembly; generating electronic heater control signals in dependence on said inlet water temperature to control the water temperature; disabling heating operation of the heater assembly if a body of water is not present within the heater assembly; and automatically enabling heating operation of the heater assembly upon subsequent detection indicating the presence of a body of water within the heater assembly.