Immersion heater and thermostat unit

Claim 1

An electric heater for use with a small container for heating the liquid contents thereof and comprising: an electrically non-conductive heater core having an open center, a heat conductive metal stainless steel heater can having one closed and one open end, said heater core being operatively positioned in said heater can to extend longitudinally, thereof, said can being adapted to be positioned within a container to heat the contents thereof, a heater coil carried by said heater core on only a portion of said heater core immediately adjacent said closed end, a thermostat extending transversely of said heater core immediately adjacent the open end of said heater can and connecting to said heater coil, foam glass bead insulation means within said heater can and core and filling said core, and a paper insulation sleeve totally encompassing said thermostat and extending longitudinally beyond the same at each end whereby the thermostat is insulated from heat in said heater core to measure more rapidly and accurately the temperature of a liquid in which the heater can is immersed, said heater core having a pair of downwardly extending diametrically opposed slots formed in its upper end, said insulation sleeve encompassed thermostat being positioned in said slots and extending across the open center of said heater core.