Resideo Line Volt 7-day Programmable Thermostat for Electric Heat TH115-A-240S-B/U

The TH115-A-240S-B is a line-voltage thermostat from Resideo (Honeywell Home) for electric resistance heat — baseboard, convectors, radiant ceiling or panel heaters, wired for 240 V.

Line voltage is the distinction that matters here. A low-voltage thermostat switches a 24 V control circuit and lets a furnace or boiler do the work; a line-voltage thermostat carries the full heater current itself. They are not interchangeable, and a low-voltage stat wired to a baseboard circuit fails immediately.

This is a single-pole thermostat: it breaks one leg of the supply. One leg stays live at the heater even with the thermostat off, so the circuit breaker is the only true disconnect. Confirm what your installation calls for before substituting a single-pole for a double-pole.

The 7-day schedule lets the heat drop back when the room is empty and recover before it is used again. On electric resistance heat, where every watt is billed at full price, setback is the single largest saving available — there is no efficiency to improve, only run time to remove.

Match the voltage and the pole configuration to the heater circuit, and check the amperage of the heater against the rating of the thermostat. A thermostat sized below the load is the most common cause of a line-voltage stat failing in its first season.

• Brand: Resideo (Honeywell Home)
• Manufacturer Part #: TH115-A-240S-B/U
• Type: Line-voltage thermostat
• Voltage: 240 V
• Poles: Single-pole
• Control: Programmable 7-day
• UPC: 775264924644
• Category: Line Voltage Thermostats

Questions about fit or compatibility? Ask our team. We usually reply within one business day.