A.o. Smith Corporation

Yonghua Cheng

Larry Chanasyk

Dayan Bi

Hongfei Ma

Liliang Dou

Jianmin Yin

Mohamed Mehdi Doura

Ziwen Fu

Tingyu Li

Jun Xiao

Ayman Abdel-Rehim

A water heater includes an inner water tube coil and an outer water tube coil separated by a drum baffle. The inner and outer coils extend above a top edge of the drum baffle by at least a full turn of each coil. A flue gas bypass path is defined between a top edge of the drum baffle and a top insulation layer above the inner and outer coils. Flue gases flow radially though the inner coil, up along the drum baffle, through the flue gas bypass path, and downwardly over the outer coil to heat water flowing through the inner and outer coils. The water flows into the outer coil at the bottom of the coil, winds upwardly through the outer coil in countercurrent flow with respect to the flue gases, then down through the inner coil.

Water heater having highly efficient and compact heat exchanger

A method of assembling multiple low NOburners including the step of assembling multiple bodies, each body including a multiple first burner ports connected to a first burner inlet and multiple second burner ports connected to a second burner inlet. The method also including the step of selecting one of the bodies and inserting a first inlet tube into the second burner inlet to provide a fuel/air mixture to the second burner ports at a first rate. The method also including the step of selecting one of the bodies and inserting a second inlet tube into the second burner inlet to provide the fuel/air mixture to the second burner ports at a second rate different than the first rate.

[object Object]

A method of assembling multiple low NOburners (), a low NOburners () and a tankless gas-fired water heater () are disclosed. The method includes the step of assembling multiple bodies (), each body () includes multiple first burner ports () connected to a first burner inlet () and multiple second burner ports () connected to a second burner inlet (). The method also includes the step of selecting one of the bodies () and inserting a first inlet tube () into the second burner inlet () to provide a fuel/air mixture to the second burner ports () at a first rate. The method also includes the step of selecting one of the bodies () and inserting a second inlet tube () into the second burner inlet () to provide the fuel/air mixture to the second burner ports () at a second rate different from the first rate.

A water heater includes a storage tank for storing water, a combustion chamber, a burner positioned in the combustion chamber, and a heat exchanger positioned in the storage tank. The burner produces products of combustion. The heat exchanger receives the products of combustion from the combustion chamber and transfers heat from the products of combustion to the water stored in the storage tank. The heat exchanger includes an upper portion and a lower portion. The upper portion is positioned above the combustion chamber and the lower portion is positioned below the combustion chamber.

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Fergus, CA, United States of America

Yonghua Cheng