Portable hot water supply tank

A portable hot water supply tank adapted to be used with a heat source, said portable hot water supply tank comprising:

• a water storage unit that includes a base member having
• an inner surface that defines a lower water chamber, and
• an outer surface that is opposite to said inner surface;
• a heat exchange unit that includes a heat exchanger being connected to said base member and being movable relative to said base member between a first position, where said heat exchanger is distal from said outer surface of said base member and is adapted to be proximate to the heat source, and a second position, where said heat exchanger is proximate to said outer surface;
• and
• a circulation unit that includes
• an inlet pipe having an inlet end that is in fluid communication with said lower water chamber, and an opposite end that is connected to said heat exchanger, and
• an outlet pipe having an outlet end that is in fluid communication with said lower water chamber, and an opposite end that is connected to said heat exchanger;
• wherein, when said heat exchanger is at the first position, water stored in said lower water chamber is drawn into said inlet pipe via said inlet end, flows through said heat exchanger to be heated by the heat source, and eventually flows back to said lower water chamber via said outlet end of said outlet pipe.