Abstract: A method of cleaning one or more electrodes (30) of an electrolytic chlorinator (10). The electrodes are immersed in water within a chamber (120). The method includes the steps of substantially stopping water flow through the chamber; supplying a volume of cleaning agent into the chamber; and agitating the water and the cleaning agent within the chamber to form a cleaning agent water mixture and to bring the cleaning agent water mixture into intimate contact with the one or more electrodes thereby cleaning the electrodes. According to preferred forms of the method, the agitation step includes activating the electrodes to liberate hydrogen and oxygen bubbles.

Abstract: A water heater for heating water includes a burner assembly (54) for generating a flow of hot gas. The burner assembly (54) includes a gas burner (52) and means (64) adjustable to determine a heat output of the burner assembly (54). The water heater further includes a heat exchanger assembly (20) for transferring heat from gas to water flowing therein. The heat exchanger assembly (20) has a higher temperature zone (110) and a lower temperature zone (100). The water heater is arranged to convey the flow of hot gas to the higher temperature zone (110) and in turn to the lower temperature zone (100).