Even with Jager heaters I wouldn't run one without a temperature controller. I had a Jager 300w that got stuck on and cooked my 120 planted tank.I’ve ran Eheim jager heaters for pretty much every tank I’ve owned in the last 20 years.
Even with Jager heaters I wouldn't run one without a temperature controller. I had a Jager 300w that got stuck on and cooked my 120 planted tank.