100W Aquarium Heater for 10-20 Gallon with Auto Shut-Off When Leaving Water—Submersible Fish Tank Heater, Dry-Burn & Overheat Protection, Explosion-Proof, Freshwater Saltwater Turtle Tank - size: 100W

About this item

• 🐟【Leaves Water? Power Cuts Instantly — Auto Restarts When Submerged】 Most aquarium heaters keep running when exposed to air during water changes or evaporation — causing meltdowns, cracked glass, or fires. This heater’s built-in sensor detects the moment it leaves the water and immediately cuts power, with an audible alarm to alert you. When you place it back in the water, it automatically resumes heating at your previous temperature setting. No reprogramming, no panic, no dead fish.
• 🐟【Triple Safety: Dry-Burn Prevention + Overheat Protection + Max Temp Auto Stop】 Three layers of intelligent protection work together: (1) Dry-burn prevention shuts off heating when heater is out of water, (2) Overheat protection stops heating the instant water exceeds your set temperature by 1°F, (3) Max temperature limit automatically stops the heater when it reaches its maximum settable temperature — even if the controller malfunctions. This heater doesn’t just heat your tank. It actively refuses to hurt your fish.
• 🐟【±1°F Precision — Red Means Heating, Green Means Ready】 The external digital controller shows real-time water temperature and your target setting simultaneously. Digits glow red while actively heating and switch to green the moment your set temperature is reached — you can tell your tank’s status from across the room. Intelligent frequency conversion continuously adjusts power output for smooth, stable temperature control without the 3-5°F swings that cheap heaters cause.
• 🐟【Seashell Guard Design — Protects Fish, Maximizes Water Flow】 The unique seashell-pattern ABS protective guard wraps around the explosion-proof 2mm quartz glass heating element. Its contoured shape directs water flow evenly around the heater for efficient heat distribution while creating a physical barrier that prevents curious fish and turtles from touching hot surfaces. Built to withstand long-term freshwater and saltwater use without corrosion.
• 🐟【100W Fits 10-20 Gallon — 5-Minute Setup, Any Tank Type】 Choose your wattage: 100W for 10-20 gal, 200W for 20-40 gal, 300W for 40-70 gal, 500W for 70-120 gal. Fully submersible for freshwater, saltwater, and brackish environments. Install with suction cups, set your temperature, and walk away. Switch between °F and °C by holding both buttons for 2 seconds. Works with glass and acrylic tanks.

Overview

• Product Dimensions ‏: ‎ 11.61 x 6.4 x 2.3 inches; 1.3 Pounds
• Item model number ‏: ‎ HA-a1
• Date First Available ‏: ‎ September 24, 2025
• Manufacturer ‏: ‎ HANLESHUKA
• ASIN ‏: ‎ B0DLZNSQGH
• Best Sellers Rank: #20,023 in Pet Supplies (See Top 100 in Pet Supplies) #25 in Aquarium Heaters
• Customer Reviews: 4.3 4.3 out of 5 stars (209)