Abstract: Control circuitry is disclosed for use with a tankless water heater system including a plurality of water conduits connected in series. The control circuitry includes a plurality of water heater elements, one each associated with each of the plurality of water conduits. A controller includes a central processing unit (CPU) with an operating program and each of the plurality of water heater elements are coupled to the CPU. The CPU is programmed to individually activate one of the water heater elements to a predetermined power level in response to a demand for heated water. The number of water heater elements activated and the power level of the activation is determined by the demand for heated water.
Type:
Grant
Filed:
March 15, 2005
Date of Patent:
January 16, 2007
Inventors:
William R. Sturm, Joseph M. Sullivan, Thomas J. Shortland, Kevin Hay, Gregg C. Johnson
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