Fluval E300 Advanced Electronic Heater 300 W, up to 100 US Gal / 375 L

An electronic, digitally-controlled aquarium heater with precise temperature readout and control, rated for tanks up to 100 US gallons at 300W. The electronic thermostat holds temperature more consistently than older mechanical dial heaters, which matters most for sensitive livestock and planted tanks where even small temperature swings can stress fish or slow plant growth.