Honeywell T87K1007 Thermostat

The Honeywell T87K1007 is a mercury-free, digital round thermostat designed for precision control in 2-wire heat only systems. Operating within a standard 18-30Vac range, this unit utilizes battery assisted power stealing to ensure consistent performance without requiring a common wire, making it a reliable solution for retrofitting older heating systems. The internal thermistor sensor element provides exceptional 1 degree accuracy, maintaining tight control over the 40-90?F temperature setting range. Rated for an operating humidity range of 5-90% RH non-condensing, the Honeywell T87K1007/U variant is physically and electrically identical, featuring the classic Premier White styling that contractors and homeowners expect. This single stage heat thermostat is compatible with most gas, oil, or electric heating applications, offering a mechanical interface with digital reliability for simplified field installation and long-term stability in residential environments.

• No C-Wire Required: The power-stealing design allows for easy installation on 2-wire systems, reducing labor time during retrofits.
• Mercury-Free Construction: Meets all environmental regulations while retaining the intuitive user interface of the traditional round thermostat.
• Precision Monitoring: High-quality thermistor technology minimizes temperature swings, ensuring high-efficiency cycling of the heating equipment.
• Contractor Friendly: The large, easy-to-read scale and simple dial adjustment simplify setup and user operation.

How do I calibrate a Honeywell T87K1007 for accuracy?
The unit features a factory-calibrated thermistor sensor that maintains 1 degree accuracy; ensure it is mounted level and away from drafts for optimal performance.

Will the T87K1007 work with electric baseboard heat?
This model is designed for 24V control circuits; for line voltage (120V/240V) electric baseboard systems, a transformer or different model is required.

What is the difference between the T87K1007 and the T87K1007/U?
There is no technical difference; the "/U" suffix simply denotes the retail-ready or universal packaging variant of the same professional-grade component.

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.