The Dewenwils Digital Temp Controller is a plug in outlet with a wired temperature probe that switches heaters or cooling equipment on and off at the temperatures you set. It handles up to 15 amps and 1800 watts, covers a control range from -40°F to 210°F, and adds cycle and countdown timer modes for scheduled tasks.
It fits livestock owners, poultry keepers, indoor growers, and anyone with a well house or greenhouse who wants plug in temperature controllers for heavy draw equipment. Settings are made on the unit itself rather than through an app.
Specifications
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Output Capacity: 15A, up to 1800W
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Control Range: -40°F to 210°F
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Precision: 0.1°F adjustment
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Control Modes: Heating and cooling
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Timer Modes: Cycle timing, countdown on, countdown off, and countdown on and off
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Display: VA screen with self illuminating characters for dim and dark spaces
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Probe Cable: About 6 feet
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Calibration: Adjustable temperature calibration
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Power Memory: Restores previous settings after a power outage
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Protection: Overload protection for connected equipment
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Color Options: White or black
Running Stock Tank Heaters, Coop Heat, and Grow Room Heaters Only When Temperature Calls for It
If you keep a heater in your stock tank all winter or run heat in a chicken coop, this controller lets that equipment run only when temperatures actually drop, instead of all day and night. Set it to switch on near freezing and off a few degrees above, and the heater stops drawing power on mild afternoons.
The same setup works for keeping a well house from freezing or holding a greenhouse at a steady minimum with a space heater. Flip it to cooling mode in summer and it will run fans when a space heats up.
The 6 foot probe cable lets you mount the controller near the outlet while placing the sensor where the temperature matters, and power memory brings everything back after an outage without you resetting it.
What to Expect from the Dewenwils Digital Temp Controller in Real Use
Purchasers use it to cycle stock tank heaters off once temperatures rise above freezing, run an oil radiator heater in an indoor grow room, keep chickens warm, and power cooling fans in an enclosed cabinet.
Programming is described as easy to figure out, and owners found more functions than expected, including timers and delayed start. Readings checked against a separate sensor confirmed the controller was switching at the right temperatures, and the power memory feature has kept settings intact after outages.
The display turns off after 30 to 60 seconds, which is fine for automated use but can be frustrating if you want to watch the temperature while working nearby. There is no app or remote monitoring, so checking status means walking to the unit. The long probe wire makes it simple to position the sensor away from the controller.
Real-world performance notes sourced in part from verified Amazon customer purchases.
Frequently Asked Questions
How do you use a thermostat controller with a stock tank heater?
Plug the stock tank heater into the controller, set it to heating mode, and choose a start temperature near freezing and a stop temperature a few degrees higher. Place the probe where it reads the conditions around the tank, out of direct sun so afternoon heat on the sensor doesn't shut the heater off early. The heater then runs during cold stretches and shuts off on milder days, cutting the hours it draws power.
Can the Dewenwils controller run a fan for cooling?
Yes. Switch the controller to cooling mode and set the start temperature higher than the stop temperature. The fan turns on when the space warms past your start point and shuts off once it cools to your stop point. This works for greenhouse circulation fans, coop ventilation, and enclosed spaces where equipment builds up heat.
Why does the display on a digital temperature controller turn off?
The Dewenwils display goes dark after roughly 30 to 60 seconds without input. The controller keeps monitoring temperature and switching your equipment while the screen is off. Press a button on the unit to wake the display and check the current reading or adjust your settings.
