Method and apparatus for operating an electric water heater

Details Method and apparatus for operating an electric water heater Method and apparatus for operating an electric water heater

2007-08-14

2007-08-14

Campbell, Thor (Department: 3742)

Electric resistance heating devices

Heating devices

Tank or container type liquid heater

C392S498000

Reexamination Certificate

active

11328520

ABSTRACT:
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 and an OFF state. The control module maintains a stratification of water within the water heater including a first volume maintained at a set point temperature and a second volume held at a setback temperature, which is less than the set point temperature. The setback temperature is low enough to maintain the stratification yet high enough to allow the upper heating element to heat water from the second volume to the set point temperature prior to exiting the water heater.

REFERENCES:
patent: 4598694 (1986-07-01), Cromer
patent: 4739728 (1988-04-01), Kale
patent: 5921207 (1999-07-01), DiSalvo et al.
patent: 6208806 (2001-03-01), Langford
patent: 6363216 (2002-03-01), Bradenbaugh
patent: 6374046 (2002-04-01), Bradenbaugh
patent: 7117825 (2006-10-01), Phillips
patent: 2001/0031138 (2001-10-01), Troost
patent: 2005/0147401 (2005-07-01), Baxter
patent: 2006/0013572 (2006-01-01), Phillips
patent: 2007/0034169 (2007-02-01), Phillips

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