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This has been replaced by the Surestat TS116 thermostat. Click here to view the updated version.

This single stage thermostat comes prewired with an 8' grounded Plug in power cord. Simply plug the thermostat into a standard 110/120 volt outlet. Then plug any 110/120 volt appliance into the outlet on the plug of the thermostat. Select heating thermostat to control a heater or cooling thermostat to control fans and/or louvers.
*Plug-in thermostats can not be used with our gas heaters. They require 24 volt thermostats.


  • Wide temperature range: 30° to 110° F
  • Fixed 3 degree differential
  • Plug-N-Play, no wiring needed (16 amp/120v max)
  • Includes 8' prewired cord
  • Weatherproof enclosure

Thermostat placement in a greenhouse: To get the desired temperature, thermostats should be located at plant height near the center of the greenhouse where they are not influenced by drafts or the temperature of an exterior wall. It is best if both heating and cooling thermostats are located together and protected from direct contact with sunlight and water. One simple way to accomplish this would be to mount the thermostat(s) to a piece of wood (or other nonconductive material) with a top on it like in the picture to the left. Wood should be painted white to shade it from the sun.

What is a Differential? The difference between on and off setpoints on a control. For temperature, it is the difference in degrees between the thermostat's on and off setting. If you set a heating thermostat with a 3 degree differential to 71°, it will supply power at any temperature below 71° and cut off at 74° (3 degrees above the setpoint). A cooling thermostat would cut on above 71° and off at 68°.

Overall Customer Rating of 4 Reviews:

awsome thermostat

i tried several thermostats and this is by far the best

Olympia Wa.

This thermostat works very well and is accurate.


SureStat thermostat

So far so the SureStat thermostat has been working well to control a small heater in the greenhouse. Time will tell if it holds up over the long run


Fantastic device

This is the second thermal switch I've ordered. I installed it along with a second heater (separate circuit so I don't blow a fuse!) in my greenhouse. I love that it's completely analog - no fumbling around with programming or worrying about overheating, power spikes, or pulling too much current over a prolonged period of time as with some digital ones.
Works very well. I have thermometers monitoring the greenhouse heaters, so I can watch in real time or look at graphs of temperatures and temp spikes to see that the switches are working properly, accurately, and dependably. Highly recommend this unit.