US 3,927,300 · Granted 1975-12-16

Electric fluid heater and resistance heating element therefor

An electric fluid heating element comprises a column-shaped honeycomb structural body of an electrically conductive cermaic material having a positive temperature coefficient of resistance. The body has a multiplicity of substantially uniform parallel channels extending therethrough with each of the channels being bounded by a partition wall which is substantially uniform in thickness. The body has a surface to volume ratio in the range of 10 to 60 cm2/cm3 and is selfcontrolling without the necessity of a safety device such as a fuse or thermostat. Ohmic electrodes are mounted on oppsoite surfaces of the body to supply heating current thereto. The heating element can be used as the heating means in an air heater, humidifier or liquid heater.

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