Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1992-11-06
1995-08-15
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219497, 219508, 219505, 219483, 374105, 340589, H05B 102
Patent
active
054421578
ABSTRACT:
A control/safety apparatus and method for an electrical or fuel fired water heater includes one or more temperature sensors strategically located on the water heater vessel at a level at or above a critical water level. The time rate of temperature change is calculated from the sensed temperature. An abnormal value of temperature change rate corresponding to an insufficient water level deactivates the heater to prevent damage to the heater. Water level, projected heating times, heater malfunctions and other operating parameters may be calculated or detected based on the time rate of change in sensed temperature.
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patent: 4740671 (1988-04-01), Kuroda et al.
patent: 5079407 (1992-01-01), Baker
patent: 5103078 (1992-04-01), Boykin et al.
Paschall Mark H.
Water Heater Innovations, Inc.
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