Hi,
Have used such controllers for over 25 years, think you would have heard about it by now if they were problematic.
Set your heater stat, if fitted, to 2 - 3 deg c above your desired temp, so if you did have any problem with the temp controller the heaters stat will act as double protection.
The most likely problems are when you do tank maintenance and water changes, you may forget the temp sensor is exposed so it will turn the heater on, which if also below its normal water level can cause a problem, so get into the habit of always switching it off first.
Also its easy to knock the sensor out of position without realising it, so once happy with its location, eg in a good flow location, secure it and / or the cable to a pipe or sucker with a cable tie.
Have used such controllers for over 25 years, think you would have heard about it by now if they were problematic.
Set your heater stat, if fitted, to 2 - 3 deg c above your desired temp, so if you did have any problem with the temp controller the heaters stat will act as double protection.
The most likely problems are when you do tank maintenance and water changes, you may forget the temp sensor is exposed so it will turn the heater on, which if also below its normal water level can cause a problem, so get into the habit of always switching it off first.
Also its easy to knock the sensor out of position without realising it, so once happy with its location, eg in a good flow location, secure it and / or the cable to a pipe or sucker with a cable tie.
