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Class Information
Number: 122/18.31
Name: Liquid heaters and vaporizers > Stand boiler (e.g., water heater, etc.) > Fluid fuel burner > Having heat exchange feature > Fire tube or flue surrounded by water containing chamber > Penetrates one side of water chamber to another
Description: Subject matter wherein the fire tube or flue passes through a wall of the water chamber to an opposing wall.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8616158 Non-dilution blower apparatus for high efficiency water heater Dec. 31, 2013
8375898 Storage type boiler heating exchanging structure for preventing condensation Feb. 19, 2013
8047164 Removable heat exchanger for a gas fired water heater Nov. 1, 2011
7900589 High efficiency water heater Mar. 8, 2011
7559293 High efficiency water heater Jul. 14, 2009
7258080 Fuel-fired dual tank water heater having dual pass condensing type heat exchanger Aug. 21, 2007
6868805 Horizontally oriented combustion apparatus Mar. 22, 2005
6725811 Water heater with low NOx fiber matrix burner Apr. 27, 2004
6698385 Combustion chamber shield for hot water heaters Mar. 2, 2004
6622660 Blower mixing tee Sep. 23, 2003
6622661 Fuel-fired heating appliance with dilution air/flammable vapor bypass tube and elevated combustion air inlet Sep. 23, 2003
6584940 Flue pipe control Jul. 1, 2003
6553948 Water heater Apr. 29, 2003
6435140 Gas-fired heaters with burners having a substantially sealed combustion chamber Aug. 20, 2002
6422179 Water heater flue system Jul. 23, 2002
6418884 Fuel-fired heating appliance having flame arrestor plate with associated scale deflector shield Jul. 16, 2002
6360699 Device for heating fluid Mar. 26, 2002
6354248 Heat exchange element for a water heater flue Mar. 12, 2002
6334411 High efficiency, glass-lined, combination space and hot water heater Jan. 1, 2002
6311646 Hot water heater Nov. 6, 2001
6286465 Water heater flue system Sep. 11, 2001
6283067 Potable water temperature management system Sep. 4, 2001
6161506 Pulsed air combustion high capacity boiler Dec. 19, 2000
6055944 Heating device May. 2, 2000
6053130 Power vent water heater with electronic control system Apr. 25, 2000
6019069 Gas-fired heaters with burners which operate without secondary air and have a substantially sealed combustion chamber Feb. 1, 2000
5970923 Tank structure for hot-water supply unit Oct. 26, 1999
5950573 Power vented water heater with air inlet Sep. 14, 1999
5937796 Gas apparatus for heating fluids Aug. 17, 1999
5924390 Water heater with co-located flue inlet and outlet Jul. 20, 1999
5913675 Low NO.sub.x gas burner Jun. 22, 1999
5881681 Water heating system Mar. 16, 1999
5875739 Gas-fired heaters with burners which operate without secondary air and have a substantially sealed combustion chamber Mar. 2, 1999
5871006 Hot water heating system Feb. 16, 1999
5845632 Vent damper including pivot poppet Dec. 8, 1998
5826569 Low NO.sub.x water heater with finned burner Oct. 27, 1998
5799622 Furnace heat exchanger tube cleaning system Sep. 1, 1998
5797355 Ignition inhibiting gas water heater Aug. 25, 1998
5797356 Simplest high efficiency universal water heater Aug. 25, 1998
5791298 Water heater with low emission gas burner Aug. 11, 1998
5787846 Variable flow volume control baffle for water heater Aug. 4, 1998
5775268 High efficiency vertical tube water heater apparatus Jul. 7, 1998
5697330 Power-vented, direct-vent water heater Dec. 16, 1997
5690061 Water heater with expansion tank Nov. 25, 1997
5682841 Variable flow volume control baffle and vent damper Nov. 4, 1997
5678533 Hot water heater with separator structure Oct. 21, 1997
5660165 Back-up heater Aug. 26, 1997
5588399 Flue for water heater Dec. 31, 1996
5586547 Instantaneous gas water heater Dec. 24, 1996
5575273 Balanced flue outdoor water heater Nov. 19, 1996

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