Honeywell Home TH114-A-240D-B/U Line Volt Manual Thermostat for Electric Heat

The TH114-A-240D-B is a line-voltage thermostat from 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 double-pole thermostat: it breaks both legs of the supply, so the heater is fully de-energized when the thermostat is satisfied or turned off. Double-pole is what most jurisdictions require on 240 V baseboard, and it is what makes the heater safe to work on with the thermostat off.

This is a manual thermostat: one setpoint, held until someone changes it. In a room that is occupied on no particular schedule — a workshop, a spare room, a rental — a manual stat is the one that actually gets used, because no one has to reprogram it after a power cut.

Rated temperature accuracy is 0.9 °F. On electric heat that number is felt directly: a stat with a wide swing runs the room warm to avoid running it cold, and the extra degree is paid for every hour.

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: Honeywell Home
• Manufacturer Part #: TH114-A-240D-B/U
• Type: Line-voltage thermostat
• Voltage: 240 V
• Poles: Double-pole
• Control: Manual
• Accuracy: 0.9 °F
• UPC: 775264924781
• Category: Line Voltage Thermostats

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