I read the bad reviews and thought yes. I bought 2 of these last week. They were both set at 83 degrees. They heated the water around them so that it literally boiled on the glass of the heater. Then both of them cracked leaving glass on the bottom of both of my aquariums. I pulled a fish out of one of those burnt tanks yesterday and couldn't figure out what the problem was; Since all the water was ok, the exact feeling is a little warm. Now I know
Tetra HT Submersible Aquarium Heater: Efficiently Regulate Temperature with Electronic Thermostat
9 Review
Accumulative electric water heater Thermex Ceramik 50 V, white
11 Review
Faucet water heater with display
13 Review
π Fluval E300 Electronic Heater - 300W Advanced Aquarium Heater for Tanks up to 100 Gallons (A774)
9 Review
π U-BCOO Aquarium Gravel Cleaner Fish Tank: Manual Siphon for Efficient Filter Gravel Cleaning and Water Change in Tanks
22 Review
Jasonwell Magnetic Aquarium Fish Tank Glass Algae Cleaner - Floating Brush (L Size)
37 Review
Steam cleaner Deerma Deerma DEM-ZQ610 EU, white/red
68 Review
Greenpro Micranthemum Monte Carlo: Live Large Pearl Grass Aquatic Plant In Tissue Culture Cup For Freshwater Fish Tanks And Aquariums
49 Review