White-Rodgers 1C26-101 Thermostat

The White-Rodgers 1C26-101 is a core 24V single stage 1H/1C thermostat designed for contractors looking for a dependable, battery-free mechanical solution. This mercury-free mechanical thermostat utilizes rugged snap-action contacts to provide reliable switching for gas, oil, and electric furnaces, as well as single-stage heat pump systems without auxiliary heat. The unit features a built-in adjustable heat anticipator (0.15 to 1.2 Amps), allowing for precision tuning of heating cycles to match equipment requirements and prevent temperature swings. Its vertical rounded profile includes a bi-metal thermometer and clear analog display with a setpoint range of 50-90°F. Terminal designations—RH, RC, G, W, Y, O, B—ensure broad compatibility, including dual-transformer installations when the factory-installed jumper is removed. For field service efficiency, the 1C26-101 vertical mount includes a wall-mounting subbase and an optional decorative wall plate to cover existing mounting holes from legacy controls.

• Mechanical Reliability: No batteries required for operation, eliminating nuisance service calls related to power failure in the control circuit.
• Snap-Action Contacts: Provides positive, clean switching without the environmental hazards associated with older mercury-bulb designs.
• Optimized Compatibility: Supports a wide array of systems, including millivolt heat-only, 24V conventional 1H/1C, and single-stage heat pumps.
• Precision Cycle Control: The adjustable heat anticipator allows for fine-tuning the burner duration to maximize residential comfort.

• Can this be used with two-transformer systems? Yes, the White-Rodgers 1C26-101 is compatible with dual-transformer sets by removing the factory-installed jumper between the RH and RC terminals.
• Does this work with heat pump reversing valves? It features both 'O' and 'B' terminals, supporting heat pump reversing valves energized in either heating or cooling modes.
• Is leveling required during installation? Because this model uses a bimetal thermometer and snap-action contacts rather than a mercury bulb, it is less sensitive to leveling, though a level mount is recommended for aesthetic accuracy and proper dial calibration.

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.