The Inkbird ITC-312 is a plug-in temperature controller with one heating outlet and one cooling outlet, managed from the INKBIRD app over Bluetooth 5.0 or from the unit itself. You can run simple start and stop temperatures, a day and night schedule, or up to 12 timed periods per day.
It works for greenhouses, seedling heat mats, fermentation chambers, and heated sheds. App control works within Bluetooth range of up to 328 feet, and the controller keeps running and logging data on its own when your phone is out of range.
Specifications
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Connectivity: Bluetooth 5.0, up to 100 meters (328 feet)
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Outlets: Two, one for heating and one for cooling
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Maximum Output: 1200W combined
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Probe: IP67 waterproof with a stainless steel tip, permanently attached
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Probe Range: -40°F to 212°F
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Control Modes: Standard start and stop, day and night ranges, and time mode with up to 12 periods per day
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Alarms: High and low temperature alerts
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Refrigeration Protection: Compressor delay function
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Calibration: Adjustable temperature offset
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Data Storage: Up to 30 days on the device, synced to the app, which stores a full year of history
Controlling One Heater and One Cooler in a Greenhouse, Shed, or Fermentation Chamber
If your space needs heat when it gets cold and cooling or ventilation when it gets warm, the ITC-312 lets you run both from a single controller. Plug a small heater into the heating outlet and a fan or refrigerator into the cooling outlet, then set separate start and stop temperatures for each.
The day and night and timed modes let you drop temperatures overnight in a greenhouse or step a fermentation schedule without adjusting it by hand. This setup works well for a garden shed or outbuilding you visit regularly, since app control happens over Bluetooth while you are nearby. If you need two heating outlets or want to check temperatures from off site, plan on a different controller.
What to Expect from the Inkbird ITC-312 in Real Use
Verified purchasers run the ITC-312 on fermentation fridges, keezers, a kegerator tower fan, reef and freshwater aquariums, and a battery warmer in an unheated garage. Readings are described as accurate and in agreement with a calibrated sensor.
In a fermentation chamber, heating and cooling set just 1°F apart held within about a tenth of a degree. Most owners find the app easier than the side dial, which takes the manual to learn, and the controller keeps logging when the phone drops out of range, then syncs on reconnect.
Know the limits going in. Control is Bluetooth only, so there is no monitoring while you are away, and a few owners mention occasional trouble connecting. The outlets are fixed as one heating and one cooling, which caught out an owner expecting to heat with both during a freeze, so compare other thermostat options if that is your plan.
The probe is hardwired, so routing it through a fridge wall may call for a grommet, and the small sun and snowflake outlet markings are hard to see. There is no prebuilt Home Assistant connection.
Real-world performance notes sourced in part from verified Amazon customer purchases.
Frequently Asked Questions
Can you monitor the Inkbird ITC-312 when you are away from home?
No. The ITC-312 connects to the INKBIRD app over Bluetooth, not WiFi, so you can only view and adjust it while your phone is within range. The controller continues to hold your settings when your phone disconnects, and it stores up to 30 days of temperature data that syncs to the app the next time you reconnect.
Can both outlets on the Inkbird ITC-312 be used for heating?
No. One outlet is dedicated to heating and the other to cooling, marked with a small sun and snowflake symbol. If you plug a second heater into the cooling outlet, it will only receive power when the controller calls for cooling. For setups that need two heat sources controlled separately, you will need a controller with two heating outlets.
How do you connect the Inkbird ITC-312 to the app?
Download the INKBIRD app and create your account inside the app rather than on the website. Do not pair the controller through your phone's Bluetooth settings. With the controller plugged in, open the app and it should detect the device and walk you through setup. If the app says your email or password is incorrect after creating an account, use the forgot password option to reset it and enter the security code to finish signing in.
