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High efficiency tank type continuous flow and self cleaning water heaterRelated Patent Categories: Liquid Heaters And Vaporizers, Stand Boiler (e.g., Water Heater, Etc.)High efficiency tank type continuous flow and self cleaning water heater description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070062464, High efficiency tank type continuous flow and self cleaning water heater. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This is a continuation-in-part of patent application Ser. No. 994,627 filed Nov. 22, 2004 (Publication. No. 2005/0109287 A1, published May 26, 2005). BACKGROUND OF THE INVENTION [0002] This invention relates generally to water heaters, and specifically to water heaters having increased heating efficiency, provision for producing continuous flow and preventing substantial accumulation of sediment by introducing a self-cleaning mechanism, and to a method of operating the same. [0003] Applicants prior U.S. Pat. No. 6,508,208 issued Jan. 31, 2003, to Frasure, et al. discloses a water heater, for which the present invention provides improvements. [0004] Reames, Jr., U.S. Pat. No. 4,175,518 dated Nov. 27, 1979, discloses a preheating device for hot water heaters, which employs hot gases of combustion from the flue to preheat incoming cold water and to continually preheat water stored in the water tank by natural recirculation. Use of the device provides for increased fuel efficiency because hot combustion gases from the heat source are used for warming of water before venting to the atmosphere, the result being an average increased temperature within the tank so that lesser amounts of fuel are required to reach any desired hot water temperature. [0005] Leiter Klaus and Walder Gerhar, PCT Publication No. WO01 13045 dated Feb. 22, 2001, discloses a sanitation unit having a hot water boiler and a water treatment unit with a functional element, in particular for the prevention of deposits of scale, whereby a circulation pump is provided, through which water taken from the hot water connection of the boiler can be routed through the functional element to the water treatment unit of the cold water connection of the boiler. The circulation pump and the functional element are constructed as one compact structural unit. [0006] Burwell, U.S. Pat. No. 2,549,755 dated Apr. 24, 1951, discloses a burner base for a hot water tank of the type having a side arm heat-transfer coil carried within a chamber disposed adjacent the tank and means defining a flue passage in said base and communicating, respectively with the said open chamber and the chamber in which the heat-transfer coil of the said tank is carried, whereby gaseous products of combustion emanating from said burner may be directed from the bottom of said tank to the heat transfer coil thereof. [0007] All the water heaters utilizing a coil that were found in the prior art relied on natural convection to circulate water through the coil. As a result, the coil can become overheated and get damaged when the burner is operating. None of the aforesaid prior arts teaches for increasing the efficiency by controlling the condensation problem. The condensation problem is solved by keeping the water vapor produced by the flame away from the cooler flue wall and by utilizing the hot air many a times by circulation of the same keeping safety and atomization of the system in mind. Moreover none of the prior arts also teaches a self-cleaning mechanism of tank and the coils used by the system. Hence, the prior art devices do-not appear to substantially use the waste heat energy and prevent the accumulation of the sediments, despite claims to the contrary. SUMMARY OF THE INVENTION [0008] It is an object of the present invention to provide an improved, efficient, tank type, water heater. [0009] A specific object of the present invention is to reduce condensation in the coil and the flue pipe. [0010] Another object is to provide means to prevent overheating of the system. [0011] Another object of one embodiment of the present invention is to provide means for instant and continuous flow of hot water. [0012] Another object of the present invention is to provide means for self cleaning components of the system. [0013] It has been found that improvements can be made to water heaters, such as providing an increase in the efficiency of heating, providing a continuous supply of water, and providing self cleaning of the water heater, and that these improvements can be obtained by using principle of conservation of heat energy by several means, and with the use of attachments. [0014] The present invention provides a water heater comprising a closed tank having a water inlet for connection with a water supply, and a hot water outlet connected to the tank interior; a flue pipe extending vertically through the tank and having an upper portion for connection with a vent pipe; a cylinder having a lower and upper open end disposed within the flue pipe, and spaced from inner walls of the flue pipe, and extending substantially the length of the flue pipe; a burner disposed in a lower region of the cylinder, such that combustion products from the burner rise through the cylinder, and a water conducing coil disposed within the cylinder connected with the interior of the tank. BRIEF DESCRIPTION OF THE DRAWINGS [0015] FIG. 1 is a partly sectioned front elevation view and section view of the gas-fired water heater of the present invention; [0016] FIG. 2 is a sectional view taken along lines 2-2 of FIG. 1. [0017] FIG. 3 is a schematic sectional view of another embodiment of the invention. DESCRIPTION OF THE PREFERRED EMBODIMENTS [0018] With reference to FIGS. 1 and 2, the water heater of the present invention comprises a a tank 140 having a water inlet 235 for connection with a water supply, and a hot water outlet 307 connected with the tank interior. A flue pipe 101 extends vertically through the tank and has an upper portion for connection with a vent pipe 201. A cylinder 309 having a lower end and an upper end with means for opening is disposed within the flue pipe 101, and spaced from inner walls of the flue pipe, and extends substantially the length of the flue pipe. A burner 302 is disposed in a lower region of the cylinder 309 and above the lower end thereof, such that combustion products from the burner rise through the cylinder. A water conducing coil 202 disposed within the cylinder connects with the interior of the tank. [0019] Preferably, the coil 202 has valve means 301 and 304 at its upper end for selectively connecting with the interior of the tank 140 or with the water supply, and valve means 305 and 306, at the lower end, for selectively connecting with the interior the tank or to a drain 307. Control means activate the valve means, such that in one selected activated state heat from the flue pipe is transferred from the coil to the water in the tank, and in another activated state water from the water supply is directed through the coil, immediately after burner shut-off, providing thermal shock to dislodge deposits from the inside walls of the coils for disposing to the drain. Continue reading about High efficiency tank type continuous flow and self cleaning water heater... 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