hygger Aquarium Heater, Submersible Fish Turtle Tank Heater with Intelligent Temperature Control and Leaving Water Automatically Stop Heating System, for 75-151L Freshwater or Saltwater (200W)

【Submersible Aquarium Heater】This submersible fish tank heater works for saltwater and freshwater fish tanks for 75-151L. 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.