An Incredibly Durable Thermostat for Low Voltage and Millivolt Heaters. Model # F210359 Features: Compatible with Big Maxx MHU 45/75/50/80 Natural Gas/Propane Heater Compatible with MH 25/40 High Intensity Radiant Garage Natural Gas/Propane Heater No External Power Needed Simple 2-wire System Mounts in Minutes Item Dimensions: 3" L x 1. 25" W x 3. 25" H.
