Inkbird ITC-308 Digital Temperature Controller

The Inkbird ITC-308 Digital Temperature Controller is a plug-in thermostat that sits between the wall outlet and your equipment. It reads the water with its own probe and switches power to a heater, a cooling device or both. This is the Non-WiFi ITC-308 version.

Why aquarists use it

The built-in thermostat on an aquarium heater is a common failure point. When it sticks on, a heater can cook a tank. Plugging the heater into the ITC-308 and setting the heater itself a little above your target puts the Inkbird in charge, with the heater’s thermostat as a backup. If either fails, the other limits the damage.

Dual relay

The controller has two outlets: one for heating and one for cooling. In summer, a chiller or fan can run off the cooling side while the heater runs off the other. Customizable compressor delay protects refrigeration equipment from short cycling.

Display and alarms

A dual display window shows measured and set temperature at the same time. It supports °C/°F. High and low temperature alarms sound with a buzzer if the water goes out of range or the sensor malfunctions.

Load

Maximum output load is 1100 W (110 V), enough for typical aquarium heaters. Check the combined wattage if you plug in several devices.

Setup tips

• Place the probe away from the heater, in good water flow.
• Set a small differential so the heater does not cycle constantly.
• Set alarms a couple of degrees either side of your target.
• Keep the controller above the waterline and use a drip loop.

Who it suits

Reef keepers, owners of large or valuable tanks, and anyone who has had a heater fail. Pair it with a quality heater such as the EHEIM Jager 200W or the Fluval E series for layered protection.