Multiple segment gas water heater and multiple segment gas water heater with water jacket

Claim 1

A gas water heater having (A) an annular water jacket surrounding a combustion chamber below and a vertically stacked, spaced multiple heat exchanger segments above, said multiple heat exchanger segments being spaced from said water jacket, (B) a conical top wall, in extension of the water jacket, having a central opening forming an exhaust gas passage, (C) a chimney being connected to said central opening of said top wall, (D) each heat exchanger segment having a perforated water inlet pipe and a perforated water outlet pipe within said heat exchanger segments, said inlet and outlet pipes being vertically connected to other heat exchanger segments through water pipe, (E) each heat exchanger segment having a central opening to receive a perforated exhaust flue pipe communicating to said combustion chamber and extending into said chimney, said perforations of the flue pipe being exposed between said heat exchanger segments in communication with space between heat exchanger segments and water jacket, said exhaust flue pipe having a constricted outlet within said chimney to form a venturi whereby additional exhaust gases can be induced into said chimney from the spaces between said heat exchanger segment and water jacket, (F) an incoming cold water supply tube being connected at the top portion of the water jacket for preheating, a hot water pressure relief pipe being connected to the uppermost heat exchanger segment, (G) a heated water outlet tube being connected to said perforated outlet water pipe of the uppermost exchanger segment, and (H) a connecting tube making connection between said perforated inlet pipe of the uppermost heat exchanger segment and top portion of the water jacket whereby incoming water being preheated and circulated from water jacket to said connecting tube and into said heat exchanger segments.