DR-001 wall thermostat works with single or double poles circuit with voltage inputs from 120-277VAC with 28A maximum power. It can be wired to 3360W@120V, 5824W@208V, 6720W@240V and 7756W@277V heating system with control range of temperature 41F-90F (5-32C). Wall mount design sits flush against wall with large knob allows easy adjustment to all temperatures. Double terminals with OFF position. ETL listing.