The present invention provides a control system suitable for use with abathing unit system havinga water receptacle. The control system comprises a heating module, a powersource and acontroller in communication with the heating module and the power source. Thepower sourceincludes an energy storage member for storing energy collected from a solarpanel, and isoperative for supplying power generated from solar energy to the heatingmodule. The controlleris operative for causing the power source to supply power to the heatingmodule at least in parton the basis of first information derived from a temperature of the waterwithin the waterreceptacle and second information derived from a condition associated with thepower source. Thecontroller is further operative for selecting between a first power source anda second powersource for supplying power to the heating module.
