Resideo th109proplus Line Volt Thermostat 240V Spst

Product Description

The RESIDEO th109proplus is a digital, non-programmable line voltage thermostat designed for electric heating applications. It uses TRIAC switching technology to deliver accurate, silent temperature control without the audible click of a mechanical relay. Rated for 240 volts and up to 12.5 amps (3000 watts), it handles the full load of most residential electric baseboard and radiant heating systems. The push-button interface and backlit display make it straightforward to set and read temperatures, even in low-light conditions. Licensed electricians install this unit as a direct hardwired replacement or new-installation thermostat for line-voltage electric heat systems.

The th109proplus is suited for residential and light commercial electric heating applications where a simple, reliable non-programmable thermostat is preferred. It controls electric baseboard heaters, radiant ceiling panels, and similar 240-volt line-voltage heating loads. The two-wire SPST wiring configuration keeps installation straightforward in single-stage heating systems. Temperature control spans 41 degrees F to 86 degrees F, covering the full range of typical occupied and setback heating scenarios.

Key Features

• TRIAC switching provides silent operation with no mechanical relay noise
• 240-volt, 12.5-amp rating supports loads up to 3000 watts
• Backlit digital display for easy reading in low-light environments
• Push-button interface for simple, intuitive temperature adjustment
• Two-wire SPST wiring with 6-inch tinned copper lead wires for clean terminations
• Vertical mount orientation, hardwired installation, white finish

Compatibility

Designed as an OEM-style line-voltage thermostat for 240-volt single-stage electric heating systems using a two-wire SPST configuration.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. Shut off the branch circuit breaker and verify the circuit is de-energized with a voltage tester before making any wire connections. The unit is hardwired using its 6-inch tinned copper lead wires and mounts vertically on a standard electrical box. Do not exceed the rated load of 12.5 amps or 3000 watts on the switched circuit.