Hover to zoom
Inkbird ITC-308 Temperature Controller
Dual-stage controller adds a safety net to any heater
- Plug-in design controls a separate heater and chiller or fan
- Dual-stage relay handles both heating and cooling outlets
- Large display shows current temperature and your set point clearly
- Programmable alarms warn of high or low temperature excursions
- Works as a backup against a stuck-on aquarium heater
Check the latest price and availability on Amazon.
View on Amazon →As an Amazon Associate, AquaticRig earns from qualifying purchases.
Pros
- Adds a true failsafe layer to any analog heater
- Handles both heating and cooling devices at once
- Clear display and intuitive programming
- Audible and visual alarms catch problems early
- Versatile beyond aquariums for other hobby uses
Cons
- Requires separate heating and cooling equipment to be useful
- The probe must be positioned and secured carefully
- Not waterproof, so the unit itself must stay dry
- Adds another power component to your setup
At a glance
Dual-stage controller adds a safety net to any heater
The Inkbird ITC-308 turns any basic heater into a far safer system by cutting power the moment it reaches your set point.
- Plug-in design controls a separate heater and chiller or fan
- Dual-stage relay handles both heating and cooling outlets
- Large display shows current temperature and your set point clearly
- Programmable alarms warn of high or low temperature excursions
- Works as a backup against a stuck-on aquarium heater
Product Specifications
- Type
- Plug-in dual-stage controller
- Outlets
- Heating and cooling
- Display
- Digital temperature readout
- Alarms
- High and low temperature
- Water type
- Fresh and saltwater
- Probe
- Waterproof sensor
Why we recommend the Inkbird ITC-308 Temperature Controller
Every experienced aquarist has heard horror stories about a heater sticking in the on position and cooking a tank overnight. The ITC-308 is the answer to that fear. You plug your heater into the controller, drop the waterproof probe in the tank, and the unit cuts power the instant the water hits your target. Even if the heater’s own thermostat fails, the Inkbird is there as an independent backstop.
What makes it especially useful is the dual-stage design. One outlet drives a heater while the second drives a chiller or cooling fan, so a single controller can manage both ends of your temperature range. The bright display, simple programming, and high and low alarms round it out into a genuinely reassuring piece of gear that quietly watches your tank around the clock.
Who it’s for
This is for anyone who wants real protection against temperature accidents, whether they keep a delicate reef, a planted display, or a fish room full of tanks. It pairs with the heater and cooling equipment you already own rather than replacing them. Remember the controller body must stay dry and the probe needs a secure spot in good flow, but once set up it is a set-and-forget safety upgrade that is hard to argue against.
The Bottom Line
The Inkbird ITC-308 turns any basic heater into a far safer system by cutting power the moment it reaches your set point. For the peace of mind it provides against a stuck heater, it is one of the smartest additions you can make to a tank.
View on Amazon →As an Amazon Associate, AquaticRig earns from qualifying purchases.
Frequently Asked Questions
Does the ITC-308 replace my heater?
No. It controls a heater you already own by switching its power, acting as a precise external thermostat and a failsafe against a stuck heater.
Can it control a chiller too?
Yes. It is dual-stage, with separate heating and cooling outlets, so it can run a heater and a chiller or fan from the same controller.
Is it safe for saltwater?
The waterproof probe is fine in marine tanks. Keep the controller unit itself dry and away from splashes.
What do the alarms do?
You can set high and low temperature thresholds, and the controller will alert you if the water drifts outside that range so you can react quickly.
Where should I place the probe?
Position it in an area of good circulation, away from the heater outflow, so it reads the true average tank temperature accurately.