Electric instantaneous water heater with enhanced temperature control
Patent 4786782 Issued on November 22, 1988. Estimated Expiration Date: 
July 22, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 22, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 942894 1519395 1634704 1767122 2033443 2446367 3617700 Thermal cut-out arrangement for an electric water heater Patent #: 4358665 InventorsAssigneeApplicationNo. 06/887924 filed on 07/22/1986US Classes:392/492, Producing counterflow circulation392/487With jacket for heating elementExaminersPrimary: Bartis, AnthonyAttorney, Agent or FirmInternational ClassesF24H 1/10 (20060101)F24H 9/20 (20060101) Foreign Application Priority Data1985-07-22 JPAbstractAn instantaneous water heater with enhanced temperature control and less variation in output water temperature has an output hot water pipe extending into a heating tank through the top thereof and surrounded by a coiled sheath electric heater for heating the water in the tank, the output pipe extending to the tank bottom and provided with an inlet thereat. An inlet pipe for water to be heated extends into the bottom of the tank and is throttled to provide an accelerated flow of incoming water away from the heater and outlet pipe toward an overheat prevention thermostat mounted externally on the top of the tank and connected to the heater. An output hot water temperature sensor located within the output water pipe adjacent the inlet thereof cooperates with a control unit of regulating operation of the heater to maintain the hot water output temperature at a preset level. The inlet to the water output pipe is throttled to insure mixing of the heated water, accurate temperature measurement and the reduction of scale deposition on the temperature sensor.Other References
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