InkbirdHeating Thermostat Aquarium Reptile Submersible Probe Sensor ITC306T Heater Relay Digital Greenhouse Temperature Controller Dual Stage Timer Time Switch ONLY Heat Plug Outlet NO Cooling

That's it. You need one of these if you don't want to cook your fish.

We keep fish. And we all check the tank temperature every day to assure the heater(s) are still working. And we use more than one heater to spread our bets. But then we set up auto-feeders when we take a well deserved vacation, and return home to 120 degree fish tank temperature and a bunch of suffocated fish.This device is more sophisticated than the internal thermostat in you heater(s). And I love it.The setup takes getting used to, but once you step through it, the device works- make sure you calibrate it to a trusted thermometer - my unit was spot on, but nevertheless you should check its accuracy and do the calibration step.Now that it's up and running, the temperature on my tank remains within the calibrated range - so much peace of mind.I STILL CHECK MY TANK EVERY DAY, but so far this controller is leaps and bounds better than the internal thermostats on my tank heaters. And the temperature display on the unit is so easy to read - great for older eyes...

I have owned the Inkbird Heating Thermostat controller for about six months and so far it has proved to be accurate and reliable. If you have patience to read the instructions I don't think you'll have any issues with the set up. I did find that out of the box I needed to calibrate the temp from the factory and glad to know that is a function as it was just slightly off from the digital thermometer I was using for reference.I purchased this controller for my aquarium after reading about unfortunate instances in which aquarium heaters would fail by staying on and cooking the fish in the tank. For the price, this gives me peace of mind. I currently have this controller hooked up to an Eheim Jager. Aquarium heater and have experienced no issues so I am very satisfied with my purchase.

So if you’re an aquarist like me and tend to stress over what-if scenarios, you probably worry about your heater crapping out and cooking your fish and/or killing them of hypothermia.Aquarium heaters are not invincible and the first thing to break is often their internal thermometer—the thing that says, “Ok, water’s warm enough! We can stop heating it up more now!”And when the thing that tells the heater to stop heating breaks, well...Fish don’t do well in hot water. They just don’t.I got this thing so I wouldn’t have to stress over that so much. It is *not* a heater itself; you enter the settings you want, plug your aquarium heater into this baby, and if the heater itself breaks, the Inkbird keeps it from turning your aquarium into fish soup.I took off a star because it is a bit tricky to set up. The instructions are not the greatest, but once you figure them out, it’s fine. There’s an option to set it for different temps at night vs in daytime. If you don’t bother with that, it simplifies it quite a bit.Other notes: you’ll want to get an old-fashioned thermometer to put in your tank so you can calibrate this thing based on that. My Inkbird’s temperature sensor was several degrees off. No biggie; that’s why they built in a way to calibrate it. Just be sure you do, or else it won’t be accurate. Also, if your heater has an adjustable temperature control, you’ll still need to set that to the desired temperature as well.

The media could not be loaded.  I really like this heater controller. Like a lot of other fish keepers, I’ve accumulated a lot of old junk aquarium heaters that can’t keep the temperature right. I would never trust my prized fish with the old heaters, but this heater controller saves the day and brings new life to my old heaters. I simply max out the temperature on my old heater and plug it into the inkbird heater controller. I drop the temperature probe and heater into the tank, and then set the desired temperature. That’s it! Works great and is more accurate than the internal thermostats of most heaters. I use this a lot in my small tanks to stop heaters from cooking my fish. I recommend it.

Would buy again. Works perfectly for my 2 heaters in my aquarium

I have one on every aquarium and terrarium in my house regardless of size. If you have heating elements for your aquariums/terrariums then this is a must have! NOT having to worry about all my different heating elements is worth 10 stars in my book and this is the product that brings that!

I’ve used these same thermostats in other setups and they’ve worked fine. This last one would not keep my heater in the range that I set it in and ultimately burned up my heater that I was using and ruined a client’s trophy. This thermostat cost me a client and a lot of money. Contacted customer support and they wanted me to do all kinds of things to test it out instead of just admitting that there might actually be something wrong with it.

Works well and was easy to install. Glad to have the digital temperature display, it means I can now finally retire my old floating thermometer. The ability to have a different temperature setpoint at night is interesting and something I plan to play around with. Thermostat cable is good and long so that I can position the controller in the cabinet below my tank. Something I couldn't do with my old controller.

You have to be specific on the probe when buying this product. If intended for dry place choose the probe with the stainless point and if intended for wet or aquarium used the black rubber point. I learned it the hard-way now I am more than happy and confident that my aquascape wont overheat.Update after 2 years: Still reliable I connected 2 of my submersible heater on my 75g community tank. Works really well my temp never went down and never overheat. Strongly recomend this product...

Ive had a 306T controlling a pair of aquarium heaters and it worked perfectly for about 18 months, then it began giving high readings from the probe. I contacted the company via amazon and they replaced it with a new one with the new aquarium probe completely free of charge. Ink Bird was great, It was fast and hassle free. The new unit is now operating perfectly. I can highly recommend this product. If you do not have the aquarium probe and it is immersed in water then I recommend applying some silicone around the seam between the metal and rubber.

Using for a few days. Works well. Keeps temp steady. I did have to adjust the DB from 2.0 to 0.5 to make the temp steadier. This will make the controller work harder and decrease the longevity of the internal relays. I think it's worth it for the price.

This is a great product. Does exactly what is says. I use it on my reef aquarium, and trust it with my expensive fish and corals. Has never failed me and is very precise. I have actually tested the temp with other devices and found it very accurate.