24-V Selectable-flexible Programmable Thermostat

Updated September 18, 2026

Honeywell Home X2P Single-Stage 24-Volt Selectable-flexible Programmable Thermostat Item -6788413 Model -RTH21B/N Condition: Open Box Return. Condition Notes: Please See Photo for Condition. Damage: No. Functional : Yes. Missing Parts/Pieces: No. Original Packaging: Yes. Retail Value: $49 Description below may not reflect actual item condition or included parts. Overview: The Honeywell Home X2P Programmable Thermostat is optimized for single-stage 1 heat/1 cool systems. Its flexible scheduling technology allows personalized programming to fit your lifestyle in 7 day, 5-1-1 day, 5-2 day or 1 week options - there's even a non-programmable option. It’s a quality thermostat for your home that can be customized to receive change air filter reminders, coordinate with home decor thanks to the interchangeable decorative accent pieces (comes with white and gray options), and select display settings. CUSTOMIZE: Choose to receive change air filter reminders, change out the decorative accent color with interchangeable white and gray accent pieces, and select display settings to optimize this thermostat for home SCHEDULE: Personalize programming in 7 day, 5-1-1 day, 5-2 day or 1 week options - there's even a non-programmable option EXPERIENCE: A large screen and clear font enhance daily use INSTALLATION: The Honeywell Home UWP wall plate provides an easy install process and simplifies future device upgrades FEATURES: Flexible scheduling, backlit display, custom display settings, change filter reminder, extended 32 degree F low-heat setpoint, 1-year warranty COMPATIBILITY: 1 Heat/1 Cool, 750 mV, hot water heat, forced air (gas, oil, or electric) [does not work with electric baseboard heat (120-240V)] POWER: 2 AA batteries (not included) The RTH21B is a direct replacement the RTH2510B, and replacement for the RTH2410B Additional specifications are available on the website (link attached below). Link: https://www.lowes.com/pd/Honeywell-Home-Honeywell-Home-X2P-Programmable-Thermostat-Single-Stage-1-Heat-1-Cool-Compatibility-Flexible-Schedule/5016042979

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