Here is a preliminary sketch involving the parts for my two-in-one hybrid hot water generator for our bus, Leauxie. Water is heated in two ways, through a continuous circulation solar collector (driven by a 12v circulation pump powered by the solar electric system) and a straight driven 12v to 24v electric hot water heating element. The tank itself will actually act as a third – passive heating opportunity by default. Not pictured are the input and output from the supply tank (a float valve will refill the 5 gallon tank as needed from the 42 gallon on board storage tank as hot water is used from the sink or shower). Actual reality manifesting photos and documentation to follow shortly.