White-Rodgers 1C20-101 Vert-Stat

The White-Rodgers 1C20-101 is a job-ready, mercury-free mechanical thermostat designed for single-stage heat-only applications. This low-voltage 24V thermostat features rugged snap-action contacts that provide reliable switching without the need for a leveled installation, making it a staple for quick service calls. It operates within a 50°F to 90°F temperature range and includes an adjustable heat anticipator (0.15 to 1.2 Amps) to fine-tune cycle rates and maintain tight setpoint control. Historically favored for its compatibility with 2-wire heating systems, including gas or oil furnaces and millivolt heat systems, the 1C20-101 Vert-Stat is a direct replacement for the M30 and 1C20-1 series. The vertical orientation and included cover plate (F61-2499) simplify retrofits by masking previous mounting marks. For contractors needing a non-programmable mechanical thermostat with a positive "Off" position and proven bimetal accuracy, this unit offers the simplified interface end-users expect with the durability professional installations demand.

• Universal Compatibility: Supports 24VAC and millivolt systems, making it a versatile stock item for older furnace repairs and specialized heating equipment.
• Snap-Action Reliability: Heavy-duty snap-action contacts eliminate the need for precise leveling during wall-mount installation.
• Integrated Heat Anticipation: Features an adjustable heat anticipator to optimize system cycle times and improve indoor comfort.
• Mercury-Free Design: Environmentally compliant mechanical thermostat construction facilitates easier disposal and meeting local regulations.
• Direct Vertical Replacement: Designed with a vertical profile and extra wall plate to cover the footprint of legacy bimetal controllers.

Is the 1C20-101 compatible with millivolt gas valves?
Yes, this 24v single stage vert-stat is professionally rated for both standard 24VAC and 750mV millivolt systems, commonly found in wall heaters or floor furnaces.

Does this unit require batteries or a common (C) wire?
No, as a purely mechanical thermostat utilizing bimetal technology, it does not require batteries or a C-wire connection for operation.

Can this thermostat control a cooling system or a fan?
No, this specific model is a heat-only configuration with an "Off" position. It is not designed for air conditioning or independent fan control applications.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.