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| Number | Title | Issue Date |
| 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 |
| 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 |
| 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 |
| 6938581 | Supplemental water heater tank and system A supplemental water heater tank and system features a supplemental tank with an inner vessel surrounded by an outer jacket. The space there between is generally evacuated of air so that the inner vessel is vacuum insulated. The supplemental tank includes water inle... | 09/06/2005 |
| 6920843 | Programmable water heater An apparatus for programmably controlling the operation of a water heater having a programmable timer coupled to the water heater for establishing predetermined times of when the water heater should operate. The programmable controller allows for the operation of a ... | 07/26/2005 |
| 6627858 | Hot-water supply system In a control unit of a hot-water supply system, a boiling time period is estimated based on a hot-water amount stored in a tank at a time of 23:00, a boiling start time is adjusted so that boiling operation is finished at a time immediately before 7:00. F... | 09/30/2003 |
| 6208806 | Electric water heater control A domestic water heater 10 includes a water meter 14 to count the units of water used each day and has a timer 17 to time the heating cycle each day. A programmable means 18 stores the water usage and heating data for a sixty day period and using statisti... | 03/27/2001 |
| 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 |
| 5317670 | Hot water storage system A hot water system for connection to a water supply and a local hot water usage system, comprising a plurality of series-connected reserve tanks and demand tanks for receiving water from the water supply, heating the received water to a desired temperatur... | 05/31/1994 |
| 5220807 | Combined refrigerator water heater A combined refrigerator-water heating system providing one or more insulated food storage compartments, includes an insulated water storage compartment, a refrigeration system including a compressor, an evaporation heat exchanger configured to cool the fo... | 06/22/1993 |
| 4959526 | Storage type electric water heater having a closed circulation loop with a bubble pump A hot water boiling apparatus includes a hot water tank filled with water. A water supply pipe and a hot water supply pipe are connected to the bottom and top of the tank, respectively. A bubble pump unit is arranged in parallel with the tank. The pump un... | 09/25/1990 |
| 4948948 | Water heater with multiple heating elements having different power A water heater comprised of a tank having a water reservoir defined therein. The tank has a water feed inlet and a hot water outlet. A first resistive heating element is disposed in an upper part portion of the reservoir to heat a first volume of water. A... | 08/14/1990 |
| 4935601 | Automatic control circuitry for an electrode boiler humidifier A humidifier boiler has a plurality of electrodes supplied with electric current through circuitry which includes at least one solid state switch or relay such as inverse parallel thyristors or triacs arranged to switch at zero voltage so that, when the h... | 06/19/1990 |
| 4645908 | Residential heating, cooling and energy management system A residential HVAC system includes a heat pump having a compressor arranged to heat a domestic hot water vessel and to heat or cool a storage vessel which is connected to a heat exchanger within the residence. Temperature sensors are provided at critical ... | 02/24/1987 |
| 4449178 | Method and apparatus for controlled off peak load hot water heating Apparatus and method for controlling a hot water heater to heat water during off peak load hours to a desired temperature by the end of a predetermined period of time. The heating is in partial increments, the water being heated a partial amount in each o... | 05/15/1984 |
| 4016402 | Water heater control system A water heater control system for controlling the thermostat setting on a water heater which senses the temperature on an outflow line from the water heater and energizes a control for lowering the thermostat setting during periods of low flow demand and ... | 04/05/1977 |
| 3989928 | Method and apparatus for cyclically controlling the energization of home water heaters A method and apparatus for cyclically controlling the energization of water heaters in residential homes on a daily and seasonal temperature basis. The apparatus includes a pair of clock timers each having a disk for supporting a plurality of relay actuat... | 11/02/1976 |
