Hot water dispenser system

A hot water dispensing system including:

• a water heating chamber and an expansion chamber which is vented to the atmosphere and is in fluid flow communication with the heating chamber
• a heat source for heating water in said water heating chamber,
• a tubular member having an inlet in communication with said water heating chamber and having an outlet from which heated water is dispensed,
• a faucet valve having an inlet and an outlet for supply water,
• an aspirator device between said expansion chamber and said water heating chamber, the device including a body with a venturi orifice having an inlet coupled to said outlet for supply water and having an outlet for emitting a jet of supply water and air into said heating chamber when said faucet valve is opened, said body of the aspirator having at least one inlet hole for said expansion chamber to communicate with said venturi orifice for drawing fluids from said expansion chamber, and
• a vertically disposed air collection chamber sealingly connected to said aspirator body and arranged for receiving said jet of supply water and air emitted from the venturi orifice and conducting the supply water to said heating chamber for pressurizing the heating chamber sufficiently to enable said dispensing of heated water, and having a volume sufficient to retain a column of air drawn from the expansion chamber with a pressure which is sufficient to cause the venturi device to stop drawing air from said expansion chamber.