THERMOSIPHONING Thermosiphoning is a process that utilizes basic laws of thermodynamics to create a movement of heated supply of water without the necessity of a mechanical pump. Thermosiphon refers to a method of passive heat exchange based on natural convection Movement of liquid starts when a liquid in a loop is heated and become less dense Convection move heated liquid upwards in the systems and is simultaneously replaced by cooler liquid returning by gravity Thermosiphoning is used for circulation of liquids & volatile gases in heat pumps, water heaters, Steam boilers and furnace etc.