Honeywell T87K "The Round" is a world-famous, timeless classic thermostat that is a pinnacle of simplicity and reliability. This thermostat is mercury-free and designed for 2 or 3-wire heating only applications. Super easy to use - simply dial the desired temperature. No buttons or levers and no batteries to change means that this thermostat is simple to operate and is non-programmable. Note that this model is power-stealing - double-check compatibility before purchasing. Also, being a mechanical thermostat, it has a 2-3°F accuracy (compared to 1°F in digital models) which is expected.

  • Simple to operate - simply dial the desired temperature
  • No levers, buttons and no battery changes
  • Rugged, time-proven design

Technical Specifications:
  • Programmability: Non-Programmable
  • Stages: Heat Only (Gas or oil heat / Warm air, hot water, high-efficiency furnaces, heat pumps, steam, gravity / Heat only / Heat only, 2-wire, and 3-wire hot-water valve (power open and close valves))
  • Changeover: n/a
  • Interface: Mechanical
  • Display: Analog
  • Mounting: Round
  • Color: White
  • Electrical Ratings: 24V (20-30 Vac, 0.02-1.00A)
  • Power Method: Power Stealing (Hardwired)
  • Terminal Designations: R, W, Y
  • Dual Fuel: No
  • Setting Temperature Range: 40°F - 90°F
  • Ambient conditions: 5 to 90% RH (non-condensing)
  • Dimensions: 4.06" diameter x 1.75" deep
  • Packaged Weight: 5.2 oz

5-year warranty
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