or in close proximity to the heat exchanger 140 that is filled with a heat transfer medium 160 that transfers heat from the heat source 120 to the contents of the basin 30 of the sink 20 in an eighth 8th and preferred embodiment of the invention as shown in fig9 the heat source 120 is an integral part of the basin 30 of the sink 20 and may or may not be enclosed within a heat exchanger 140 that may or may not be filled with a heat transfer medium 180 the temperature sensor 60 is connected to the system controller 100 which is itself connected to the heat source 120 user interface 80 and source of electric power 222 in a ninth 9th embodiment of the invention as shown in fig1 the heat source 120 is a component that is placed into the liquid contents of the basin 30 of the sink 20 and may or may not be enclosed within a heat exchanger 140 which may or may not be filled with a heat transfer medium 180 the temperature sensor s 60 though not explicitly shown in this figure are considered to be integral with the apparatus that comprises the heat source 120 and.