Williams Millivolt Thermostat for Furnace

This is a replacement thermostat for Williams' furnaces. No batteries required.

• Williams Direct-Vent 140, 141, 143, 145 Furnaces
• Williams Direct-Vent 220, 221, 223, 225 Furnaces
• Williams Monterey 250, 251, 253, 255 Furnaces
• Williams Direct-Vent 300, 301, 303, 305 Furnaces
• Williams Monterey 350, 351, 353, 355 Furnaces
• Williams Monterey 500, 501, 503, 505 Furnaces

Specifications:

• Product Configuration: Thermostat
• Material: Plastic
• Manufacturer Warranty: 1 Year Limited