A control system suitable for use with a bathing unit system having a water receptacle is provided. The control system comprises first and second heating modules and a controller for controlling operation of the first and second heating modules to heat the water of the water receptacle. The controller is also configured for deriving energy consumption information that may be used, amongst other, to convey energy savings and/or cost savings associated with use of the second heating module in comparison to the use of the first heating module. In some implementations, the derived energy consumption information may be instead/also be used as a parameter in the selection of either one or both the first and second heating modules to heat the water of the receptacle.
