Price: $39.95
Availability: In Stock - Usually ships in 1 to 2 days.
This thermostat has a weatherproof enclosure making them an excellent option for wet environments. The single stage thermostat can be used to automatically control ventilation fans or heaters. This thermostat was developed with the harsh greenhouse environment in mind. Temperature coil is stainless steel to prevent corrosion. SPDT switch. Wiring required.


  • Wide temperature range: 30° to 110° F
  • Fixed 3 degree temperature differential
  • Can be used with millivolt, 12, 24 and 120 volt appliances
  • Can handle 16 full load amps @120V
  • Weatherproof enclosure
  • Can be wired for heating or cooling

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°.

Product Manuals, Tips, Specs, & Guides

SureStat Instruction Manual
Overall Customer Rating of 4 Reviews:

Surestat T110

Works great. Fast shipping and great customer service. Will buy from them again.



I wanted to like this control, but I never could get it to come on at the right temperature. I had to set it about 8 degrees higher than what I wanted which was OK with me as long as it was consistent. The other problem I had was the cover for the dial would not stay closed. Water ended up collecting inside of the box. At that point I had enough. I called ACF, and they recommended the surestat ts110 model instead which was completely waterproof. I got that and a refund for the price difference. Got to hand it to them. This one works perfect and saved me some $$$!


Works, easy to install, would buy another someday but probably won't have to in a long time

greenhouse heat thermostat

Had your heat thermostat for over 50 years in my home 10x17 foot greenhouse. I just had to replace it with the same product model. That should speak for itself!