Variable-Frequency 500W Aquarium Heater, Aquarium Heater 75 Gallon Tank & Aquarium Heater 55 Gallon Tank & Below – Dual-Probe PID, 59-93°F, Quartz-Ceramic Core, IP68 Submersible, Salt & Fresh Safe

Product Brief Keep every gallon at the perfect temperature. This 500 W variable-frequency aquarium heater pairs a quartz-sealed nickel-chromium and ceramic core with dual-probe PID logic to heat ≤80 gal/300 L tanks fast, then trims power for rock-solid 59-93 °F/15-34°C stability. Integrated temperature memory restores your exact set-point after any power loss—no reprogramming needed. Heavy-duty suction cups lock the heater firmly to the tank wall, so you can set it and forget it. Out-of-water (E1) and over-temp (HH) auto-shutoffs, IP68 quartz body, grounded 3-prong plug and snap-off ABS guard keep fish safe and maintenance simple. Mount it vertically, horizontally or at 45°, set the temperature on the large LCD controller, and let the smart algorithm save energy while your fish stay comfortable in fresh or salt water.Package - 1 × 500W Aquarium Heater - 1 × External Controller with adhesive back - 1 × Power cord with US Plug - 1 × User ManualSpecification - Power: 500W - Tank volume: ≤80 gal/300 L - Cable run heater-to-controller: 5.1 ft / 1.55 m - Power cord controller-to-outlet: 2.6 ft / 0.8 m - Product size: 10.8×1.8×1.3 in/27.5×4.5×3.4 cm - Product weight: 2.04 lb/925 g

• Dual-Probe PID Brain: two independent sensors + variable-frequency 500 W continuously throttles power as water approaches set-point, cutting heat-up time in tanks ≤80 gal/300 L while holding ±0.2°F/0.1°C stability
• Explosion-Proof Quartz Tube: thickened sleeve sealed around new nickel-chromium + ceramic heating element, corrosion-proof, rated for long-term submersion
• Out-of-Water & Over-Temp Shield: top sensor triggers E1 and auto-shutoff if exposed; HH code activates when temp >93°F/34°C—keeping your fish safe and comfortable
• Grounded Safety Package: IP68 quartz body, ABS fish-guard with 0.16 in/0.4 cm heat pores, quartz-fiber cotton base for shock and temp balance, plus 3-prong grounded plug against leakage
• Click-Set External Controller: Large LCD displays both real-time water temperature and user-set temperature for instant reading; heating bar, one-touch adjust 59-93°F/15-34°C; mount via suction cup or adhesive back—no wet hands in the tank
• Energy-Smart 500 W: variable-frequency operation drops watt-draw once target is reached, saving power and extending heater life; in tanks <80 gal/300L the full 500 W boost delivers faster heat-up—compatible with ≤80 gal/300L freshwater or marine systems
• Vertical/Horizontal/45° Mount: powerful suction cups lock the heater firmly against the tank wall near the filter outlet for even circulation—no need to babysit it during operation. Caution: unit must be fully submerged; never bury in sand or gravel, or the protective sleeve may overheat and fail
• Fast-Clean Design: detachable ABS guard pops off for pad-free scrubbing; quartz shell rinses clean in seconds. Caution: Always switch off power 10 minutes before cleaning the tank, changing water, or performing any maintenance
• Temperature Memory: integrated non-volatile memory automatically restores your previous set-point after any power interruption—no reprogramming needed, ensuring your aquarium returns to its exact thermal profile immediately