The 800w heater easily handles my 125 gallon aquarium. I ordered a replacement about 6 months later as the original was not temperature controllable and the new one was sent free of charge. The new one is fine. Note: This heater, like everything I've had, measures the temperature of the water next to the heater. Therefore you have to set the temperature a few degrees warmer than you actually want the aquarium to be. You must have a way of measuring the temperature of the water in the part of the tank that is not near the heater.
Convector Electrolux ECH/T-2000 M, white
21 Review
YukiHalu Mini Submersible Aquarium Heater With Thermometer And Temperature Controller - 25W, 50W, 100W, Or 200W Options For 5-40 Gallon Fish Tanks
25 Review
Accumulative electric water heater Thermex Ceramik 50 V, white
11 Review
Sectional radiator Royal Thermo PianoForte 500, number of sections: 10, 11.7 m2, 1170 W, 800 mm.
31 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
Mini pump Xiaomi Mijia Electric Pump 1S, plastic, black
55 Review
Efficient 2-In-1 Magnetic Fish Tank Cleaner With Non-Slip Design And Scratch-Free Blades
37 Review