Review on 🐠 hygger Variable Frequency Aquarium Heater: 200W/300W/500W Quartz Fish Tank Heater with LED Digital Display Thermostat Controller by Danielle Albanese

This heater does a great job of heating my 29 gallon aquarium to 79-80 degrees. But he has a downside. The system shuts down almost daily and throws an error message (E04) indicating some kind of power fluctuation. It emits an annoying alarm that often goes off at night waking up my family members. You have to disconnect and reconnect or you won't have heat. Apparently this is his biggest mistake and therefore I will have to replace him as it is too late to go back to Revane. And this product made in China has no support. I cannot recommend this heater!