Electric resistance heating devices – Heating devices – Immersion heater details
Patent
1996-01-31
1998-06-30
Hoang, Tu B.
Electric resistance heating devices
Heating devices
Immersion heater details
392503, 219523, H05B 340
Patent
active
057746273
ABSTRACT:
An extended life electrical heating element for a water heater includes a coiled heating resistance wire having a uniform power output per coil turn. Where the heating resistance wire passes through the sheath at critical areas, e.g. return bends, the number of coil turns per unit length of element is reduced to reduce thermal power output per unit length of the element. The number of coil turns per unit length of element in bend areas may be reduced by simply stretching the coiled heating wire to attain the desired length of resistance wire per unit length of the element. Resistance wires of differing heat output per unit length may be combined with different degrees of stretching to achieve the desired element temperatures. The reduced power at the bend portions reduces element temperature to reduce hard water scaling and significantly extend the life of the element.
REFERENCES:
patent: 2380545 (1945-07-01), Pankow
patent: 2533615 (1950-12-01), Osterheld
patent: 2849590 (1958-08-01), Stiebel
patent: 3716693 (1973-02-01), Bleckmann
patent: 4319127 (1982-03-01), Lindstrom et al.
patent: 4320702 (1982-03-01), Shein et al.
patent: 4553024 (1985-11-01), Findlay
Hoang Tu B.
Water Heater Innovation, Inc.
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