Review on 🐠 AQQA Submersible Quartz Glass Fish Tank Heater - 100W/200W/300W/500W/800W - Aquarium Heater with Over Temperature Protection & External Temp Controller - Ideal for Freshwater and Saltwater Aquariums by Nadine Glaser

I bought this to replace a pre-installed heater that wasn't heating up to the right temperature so I bought this one. I've only had it for a week but so far it's holding the temperature I want. Assembly was easy, although no instructions were included. only pictures. It has a digital thermometer that hangs on the side and is easily visible. Being able to set and see the temperature without additional thermometers is a great relief.