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this BASO flame sensing probe provides a durable solution for commercial boilers

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The 103N0011 uses a PTC thermistor which increases resistance as it heats up

Robertshaw 801-22 Thermostat Common Questions What are theThe Robertshaw 801 22 Thermostat is a rugged, line voltage heating thermostat engineered for high performance temperature regulation in residential, commercial, and industrial environments. Featuring a Single Pole Single Throw (SPST) configuration, this unit is the designated updated version for Robertshaw 801, offering enhanced compatibility for retrofitting electric baseboard heaters, radiant heat systems, and electric furnaces. Utilizing a