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Honeywell T651A3018

Line Volt Non-Programmable Thermostat - One Stage Heat One Stage Cool (120-277 Volt)

(2 Reviews)


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The T651A3018 is a light duty line voltage thermostat for controlling line voltage valves, motors, contactors, electric heat, elements, duct furnaces, and fan coil units in heating / cooling systems.

Standard Features

  • Provides line voltage control of valves, motors, contactors, electric heat elements, duct furnaces and fan coil units
  • Mounts on standard vertical or horizontal outlet box
  • Automatic cooling and heating anticipation
  • Includes thermometer, range stops, locking cover screws, wall plate and horizontal scaleplate without thermometer
  • Switch breaks heating and makes cooling on temperature rise
  • Temperature range: 44°F to 86°F
  • Electrical ratings (resistive): 22A 120 to 240VAC; 19A 277VAC
  • Dimensions: 2-15/16" W x 4-1/2" H x 1-1/2" D


Manual - Conventional dial or lever style of mechanical thermostat. It doesn’t have many features.
Digital - This has a display screen and is often capable of a variety of useful functions.

Line Voltage Capable

Will operate on 120 volts A/C or 240 volts A/C as indicated for that model. Electric baseboard and specialty heaters often require a line voltage capable thermostat.

Line Voltage Capable
2 15/16 Inches
1 1/2 Inches
4 1/2 Inches

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.