(under subclass 36) Apparatus in which the control shuts off or prevents operation of a heater upon the sensing of an unsafe condition and so disables the apparatus that external intervention is necessary to return it to an operative condition.
SEE OR SEARCH CLASS
137, Fluid Handling,
65+, for a combustion failure responsive fuel safety cut-off for a burner.
236, Automatic Temperature and Humidity Regulation,
21, for a closed fluid heater having an automatic safety cut-out.
431, Combustion, 18+, for combustion devices, per se, having automatic control systems most of which are of the shut down type.