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| Number | Title | Issue Date |
| 7620302 | High efficiency, peak power reducing, domestic hot water heater A high efficiency, peak-power reducing, domestic hot water heater is described. It comprises a closed tank having a predetermined water holding capacity. A hot water outlet is provided in a top end wall of the tank. A cold water inlet is provided in a side wall of t... | 11/17/2009 |
| 7373080 | Water heater and method of operating the same A storage-type water heater and method of operating the storage-type water heater. The water heater includes a water tank for storing water, at least one heating element to heat the stored water, a jacket surrounding at least a portion of the tank, and a control sys... | 05/13/2008 |
| 7372356 | Concealed adjustable temperature switch A concealed adjustable temperature switch includes a fixed plate, an adjusting block threadedly engaged with a screw hole of the fixed plate, a bimetal plate, and a metal plate. Mounted on the adjusting block are upper and lower positioning rings and a fixing ring b... | 05/13/2008 |
| 7257320 | Method and apparatus for operating an electric water heater A control system for an electric water heater having an upper heating element and a lower heating element includes a control module that controls operation of the electric water heater by selectively toggling the upper and lower heating elements between an ON state ... | 08/14/2007 |
| 7248791 | Heater control A tank heater control that will control a heater used for heating pressurised tanks over a broad range of temperatures. The system uses a sensor for providing a signal to a processor, in which the signal is indicative of flow of gas from the tank. The processor ener... | 07/24/2007 |
| 7242858 | External reset device for an electric water heater An external reset device that is operable in combination with an electric water heater is disclosed. The external reset device is attached to an element cover that is mounted to the water heater and conceals the water heater's control device, such as a manual reset ... | 07/10/2007 |
| 7221862 | Control and method for operating an electric water heater A water heater control for an electric water heater operates according to at least one fixed hardware and/or software temperature limit and a variable software temperature limit. The control monitors a temperature of water in a tank of the electric water heater to d... | 05/22/2007 |
| 7203418 | Electric water heater with hot water outlet dip tube An electric water heater including a water container; an element associated with the water container to heat water in the water container; a cold water inlet associated with the water container; a hot water outlet associated with the water container; and a dip tube ... | 04/10/2007 |
| 7167813 | Water heater performance monitoring system A water heater performance monitoring device for monitoring whether a water heater is functioning optimally or whether it requires service. The device uses maximum heating rates taken from a plurality of measured heating rates to determine if the performance of the ... | 01/23/2007 |
| 7162150 | Thermistor sensor probe with bimetal high limit control for electric water heater control A bracket operable to support a temperature control device and a sensor probe at an external surface of a water tank for controlling and monitoring the water temperature of the tank. The bracket comprises a first receptacle, a second receptacle, and a coupling featu... | 01/09/2007 |
| 7103272 | Water heater and method of operating the same A storage-type water heater and method of operating the storage-type water heater. The water heater includes a water tank for storing water, at least one heating element to heat the stored water, a jacket surrounding at least a portion of the tank, and a control sys... | 09/05/2006 |
| 7102106 | Domestic appliances A kettle is described having a pair of heating elements each connected to a cable with a plug at its end. The two plugs can be inserted into two separate sockets of a wall plug so that each heating element separately receives power from the sockets. ... | 09/05/2006 |
| 7099572 | Water heating system and method for detecting a dry fire condition for a heating element A water heating system has a tank, a heating element, a temperature sensor, and a controller. The heating element is mounted on the tank, and the temperature sensor is mounted on the heating element. The controller is coupled to the temperature sensor and is configu... | 08/29/2006 |
| 7043946 | Disguised safe A safe for storing valuables such as guns has an external configuration that resembles a water processing apparatus such as a water heater, water softener, or pressure tank. The safe includes a door that provides access to a dry cavity within the safe for storing va... | 05/16/2006 |
| 7027724 | Water heater and method of operating the same A storage-type water heater and method of operating the storage-type water heater. The water heater includes a water tank for storing water, at least one heating element to heat the stored water, a jacket surrounding at least a portion of the tank, and a control sys... | 04/11/2006 |
| 6989514 | System and method for controlling temperature control elements that are used to alter liquid temperature A system for controlling temperature control elements used to alter temperatures of a liquid comprises a temperature sensor, a first temperature control element, a second temperature control element, and logic. The temperature sensor is configured to sense temperatu... | 01/24/2006 |
| 6957014 | Liquid heater A liquid heater comprising a plurality of storage compartments for containing liquid to be heated. The storage compartments being connected together in series and comprising at least a first end compartment for receiving liquid to be heated and a second end compartm... | 10/18/2005 |
| 6785466 | Electric water heater having balanced wattage density water heating An electric water heater has a tank portion in which water to be heated is stored. The stored water is heated by a vertically spaced plurality of electric heating elements extending into the tank interior. The heating elements are of unequal wattages, and serve uneq... | 08/31/2004 |
| 6465764 | Water heater and control system therefor A water heater having a water tight tank (10) with a cold water inlet (14) and a hot water outlet (16). First and second heating elements (24, 26) are mounted in the upper and lower portions of the tank (10). A controller is provided for energizing elemen... | 10/15/2002 |
| 6370328 | Water heating tank with thermosiphonic circulation for improved heat recovery rate An electric water heater has a vertically disposed tank with a cold water inlet, a hot water outlet and at least one horizontally disposed elongated immersion heating element extending into the region of the tank between an upper region and a lower region... | 04/09/2002 |
| 6363216 | Water heater having dual side-by-side heating elements A water heater having a water tank and multiple electric resistance heating elements extending into the water tank for heating water in the tank. The water heater includes a proportional band temperature controller for conducting electric power to the ele... | 03/26/2002 |
| 6350967 | Energy saving water heater control A water heater of the invention includes a water container; an element located to heat water in the water container; a sensor located to sense temperature; and a controller, the controller monitors the sensed temperature and compares the sensed temperatur... | 02/26/2002 |
| 6349169 | Attachment structure for vessel fitting A vessel of substantially uniform curvilinear shape comprising at least one area of a different curvilinear shape that is adapted to closely conform to and engage a number of commonly contoured curvilinear segments on a housing member constructed and arra... | 02/19/2002 |
| 6308009 | Electric water heater with electronic control A water heater has a water container and an element located to heat water in the water container. A sensor located to sense temperature proximate the element and a controller connected to the element and the sensor. The controller is programmed to compare... | 10/23/2001 |
| 6271505 | Field conversion electric water heater An electric water heater has upper and lower electric resistance type heating elements respectively controlled by a single pole, double throw upper thermostat and a single pole, single throw lower thermostat. The upper and lower thermostats are operativel... | 08/07/2001 |
| 6137955 | Electric water heater with improved heating element A water heater heating element including a base member adapted to extend through and sealingly engage a wall of a water heater tank, the base member having a recess; a thermistor positioned in the recess; members connected to the thermistor and extending ... | 10/24/2000 |
| 6002114 | Control device for an electric water heater A control device installed in an electric water heater to control its operation, the control device including a water temperature control circuit and a power control circuit, the water temperature control circuit being formed of a water temperature detect... | 12/14/1999 |
| 5968393 | Hot water controller This is a system for controlling the heating of water in the tank, water in tank adapted to be heated by a first heater and a second heater, the system comprises a timer adapted to keep time, and a sensor to monitor the temperature of the water in the tan... | 10/19/1999 |
| 5949960 | Electric water heater with dry fire protection system incorporated therein Multiple resistance type electric heating elements projecting into the interior of the storage tank portion of an electric water heater are protected against dry firing damage by using a water soluble member, representatively a sugar cube, positioned in t... | 09/07/1999 |
| 5898818 | Water feed system at constant temperature keeping the hot water from mixing with the cold water fed during use of the hot water in a single tank A water feed system at constant temperature keeping the hot water from mixing with the cold water in a single tank, the cold water being fed during use of the hot water, comprising a cold water filing tube, a solenoid of controlling circuit and a double l... | 04/27/1999 |
| 5808277 | Programmable thermostat to reduce bacterial proliferation to prevent legionellosis A domestic electric water heater comprises a cylindrical tank having a vertical wall and a curved bottom, the latter defining with the vertical wall an annular stagnant water zone susceptible of bacterial contamination by, for example, legionella bacteria... | 09/15/1998 |
| 5712951 | Electric water heater with primary and secondary pre-heatng chambers An electric water heater including a control unit, and a heating unit having a water container and an electric heating coil inside the water container and being controlled by a control unit, wherein a perforated heat-conductive cylinder is mounted inside ... | 01/27/1998 |
| 5692096 | Protection and control of continuous boiling water units A continuous boiling water unit is disclosed and comprises a water heating tank (1) containing an electric heating element (2) near the bottom of the tank (1) and a level control tank (3) mounted alongside the heating tank (1). An interconnecting steam co... | 11/25/1997 |
| 5495551 | Fast recovery circuit for heat pump water heater An external circuit that works in conjunction with the existing tank thermostatic controls to control both a water heating heat pump and the existing resistance elements in a water heater. The existing resistance elements are disabled to allow the heat pu... | 02/27/1996 |
| 5433379 | Dual tank water heating system A dual tank water heating system has an exterior tank which surrounds an interior tank. Water in the exterior tank is maintained at a prescribed temperature by heating elements located beneath the outer tank. Water in the interior tank is heated by water ... | 07/18/1995 |
| 5404421 | Fuel heating element mounting plug housing a thermostat A combined heating element and thermostat for use in a water heater. An electrical heating element includes a U-shaped rod having first and second legs, the first leg being longer than the second. A plug fits in a sidewall of the heater. The rod is instal... | 04/04/1995 |
| 5255338 | Heat pump water heater control circuit An external circuit that works in conjunction with the existing tank thermostatic controls to control both a water heating heat pump and the existing resistance elements in a water heater. The existing resistance elements are disabled to allow the heat pu... | 10/19/1993 |
| 5187772 | Electric water heater with radially extending overlapped horizontal heating element arranged in vertically spaced aligned sets An electric water heater includes a cylindrical tank with an inner surface defining a water chamber having a central vertical axis. Three sets of three electric immersion heating extend radially inwardly into the water chamber from the inner surface. The ... | 02/16/1993 |
| 5168546 | Device for heating the bacterial proliferation zone of a water heater to prevent legionellosis A domestic electric water heater comprises a cylindrical tank having a vertical wall and an inwardly curved bottom, the latter defining with the vertical wall an annular stagnant water zone susceptible of bacterial contamination by, for example, legionell... | 12/01/1992 |
| 5115491 | Tempering system for storage tank water heaters utilizing inlet and outlet heat exchanger A fluid tampering system for use with a standard water heater storage tank includes a heat exchanger which interposed between the outlet means for conveying heated fluid from the storage tank to a distribution system and the cold fluid inlet means, so tha... | 05/19/1992 |
