Resideo Llc RTH20B/N 5-2 Day Programmable Thermostat

Product Description

The RESIDEO LLC RTH20B/N is a 5-2 day programmable thermostat designed for residential heating and cooling control. It supports 1 heat and 1 cool configurations and is compatible with 750 mV systems, hot water heat, and forced-air systems running gas, oil, or electric heat sources. The large display with clear font improves readability during daily use. Powered by 2 AA batteries (not included), this thermostat suits homeowners and HVAC technicians installing a straightforward, reliable temperature control solution without complex wiring or system requirements.

This thermostat is intended for residential applications where a simple 5-2 day programmable schedule is sufficient. It works with forced-air systems using gas, oil, or electric heat and with hot water heating and 750 mV systems. It does not work with electric baseboard heat operating at 120 to 240 volts. Typical installation scenarios include single-stage heating and cooling systems in homes where a dependable, battery-powered thermostat is preferred over a hardwired or smart device.

Key Features

• 5-2 day programmable scheduling for weekday and weekend temperature control
• Supports 1 heat / 1 cool single-stage systems
• Compatible with 750 mV, hot water heat, and forced-air gas, oil, or electric systems
• Large display with clear font for easy daily readability
• Battery-powered operation using 2 AA batteries (not included) — no common wire required
• Not compatible with electric baseboard heat at 120 to 240 volts

Compatibility

Compatible with 750 mV systems, hot water heat, and forced-air systems (gas, oil, or electric). Not compatible with electric baseboard heat operating at 120 to 240 volts. Designed as an OEM-style replacement or upgrade thermostat for residential single-stage heating and cooling systems.

Installation Notes

Installation should be performed by a licensed HVAC technician or a knowledgeable DIYer familiar with low-voltage thermostat wiring. Power down the heating and cooling system at the breaker or disconnect before removing the existing thermostat. Verify system compatibility before installation, particularly confirming the system is not electric baseboard heat at 120 to 240 volts. Follow all applicable local codes and manufacturer wiring diagrams during installation.

Technical Specifications

• Schedule Type: 5-2 Day Programmable
• Stages: 1 Heat / 1 Cool
• System Compatibility: 750 mV, hot water heat, forced-air (gas, oil, electric)
• Incompatible Systems: Electric baseboard heat (120-240 volts)
• Power Source: 2 AA batteries (not included)
• Weight: 3.56 pounds
• Package Quantity: 4 per case (Unit of Measure: EA)

Standard Information

• Brand: RESIDEO LLC
• Manufacturer Part Number: RTH20B/N