hygger Aquarium Heater, Submersible Fish Turtle Tank Heater with Intelligent Temperature Control and Leaving Water Automatically Stop Heating System, for 283492L Freshwater or Saltwater (500W)

【Submersible Aquarium Heater】This submersible fish tank heater works for saltwater and freshwater fish tanks for 283-492L. It runs on 220–240V and supports a temperature range of 59–93℉ (15–34℃). The separated external LED digital display lets you view real-time water temperature and adjust settings without dipping hands into the tank; each press fine-tunes temperature by 0.5℉（0.5℃). Built-in power-off memory function retains your preset temperature after power cuts, no repeated resetting. Equipped with a 3-second child lock to prevent accidental misoperation by kids. 【Safe & Long-Lasting】The aquarium heating tube adopts thick explosion-proof quartz glass paired with high-temperature nickel-chromium wire and silicon carbide heat conductor, offering strong corrosion resistance to saltwater, algae and water impurities. High-temperature black ABS anti-scald outer shell prevents burns to fish and keepers. The fully submersible structure delivers uniform heat distribution, sturdy construction extends service life for years of steady use. 【Multi-Level Safety Protection】① Dry-fire protection: Automatically cuts power and triggers buzzer alarm once the heater leaves the water, ideal for water changing or water level drop; ② Over-temperature protection: Stops heating at target temp, auto power-off with alert if water exceeds 97.7℉(36.5°C); ③ APS anti-malfunction system: Instantly detects heating faults and shuts power within 10 seconds with dual buzzer & flashing light warning. All safety mechanisms keep your fish, turtles and reef creatures safe 24/7. 【Stable Constant Temperature & Energy Saving】Advanced variable-frequency intelligent chip delivers ultra-stable heating with accurate temperature control. When water approaches the set value, the fish tank heater for tropical fish automatically reduces power to 10%–30% to avoid drastic temperature swings that shock fish. Slow power adjustment maintains consistent tank temperature day and night, lowering long-term electricity consumption. Dual indicator lights clearly show heating/standby status for easy monitoring. 【Full Accessories & Reliable Warranty】Comes fully equipped with 1 x heater rod, 1 x digital external controller and 2 strong suction cups for flexible horizontal/vertical mounting (install at 30°–45° for optimal heat circulation). We provide a 24-month after-sales warranty with responsive customer support for any installation or function issues. Multiple wattage options (200W/300W/500W) are available to match tanks of different capacities.