White-Rodgers™ Thermostat, Heat Only Thermostat, 40 to 80 deg F Control, 3 deg F Differential, SPST/Open on Rise Switch Action, 120/240/277 VAC, 22 A at 120 VAC/240 VAC, 18 A at 277 VAC Full Load, Electrical Box Mounting, Classic White, 3.31 in W x 1.44 in D x 4.81 in H