Why do I need an aquarium heater?
An aquarium heater is an essential item if you are planning to keep tropical, warm water fish in your tank. The heater will keep your tank at a steady and controlled temperature. Correct Temperature range is very important for fish and other living organisms in the tank. Absence of it leads to stress and diseases and can even cause death of pets.

What temperature should I set the heater to?
By rotating the red dial at the end of the product you can control the temperature from 68-93.2 °F . Once you set the temperature, leave the rest on the thermometer. It will automatically turn on and off to maintain the mentioned temperature. This feature helps you saving energy and thus money. It also allows you to leave the heater inside the tank when you travel somewhere. Most tropical freshwater and marine aquariums should be maintained at temperatures that range from 74-86 °F.

Is this safe for my fish?
Yes. This 100-Watt SunGrow water heater has been equipped with integrated thermal protection circuitry. This circuitry will shut the heater down before it can overheat, so it's 100% safe. You will also never have to worry about dangerous electrical hazards to you and your pet. The heater is designed with reinforced ceramic and special explosion-proof 1.6 mm thick crystal glass. With 10" size, it's small enough to put anywhere in the tank without disturbing the fish and other pets. Please note, do NOT turn it on when it's outside water, as dry burning might lead to malfunction. It is designed to work under water only and is suitable for 20-gallon. Buy two or more if you have bigger aquariums.

What if it doesn't work? Can I claim a refund?
Absolutely. 100% satisfaction of customers is our number one priority and we have a 'No questions asked' policy. If you are unhappy for any reason (even after the Amazon return window), please contact us directly for full refund.

• ✔ EXPLOSION-PROOF GLASS & STRONG SUPPORT HOOK FOR EASY INSTALLATION--- The outer casing is made with crystal glass and highly reinforced ceramic with an explosion-proof function while being also shatterproof and waterproof. Easily install by using the solid support hook or/and 2 holders (suction cups) with the pack to attach the heating rod to your tank. Ideally place it where you can access the red knob for temperature control. It can be installed both horizontally or vertically.
• ✔ 100% WATERPROOF, FULLY SUBMERSIBLE, PERFECT FOR 20 GALLON TANKS --- The material is 100% waterproof and fully submersible. Its size is 10 inches which makes it perfect enough to attach anywhere in the tank without disturbing the fish and other pets. Its sleek size ensures that it can be hidden behind plants or decor and even if it shows, its high-tech design makes it fitting with any tank. It is perfect for 20-gallon aquarium. In case of bigger aquarium, buy two and use together.
• ✔ NO OVERHEATING, NO ELECTRIC SHOCK--- This attractive yet dependable SunGrow product is equipped with an integrated thermal protection circuitry to prevent any overheating. Please note, do NOT turn it on when it's outside water, as dry burning might lead to malfunction. It is designed to work under water only. Additionally, if the water level is lower than the heater, the rod will turn itself off and stop heating within 5 minutes.
• ✔ DE-STRESS YOUR FISH AND PREVENT DISEASES BY PROVIDING OPTIMUM TEMPERATURE --- An aquarium heater is an essential item if you keep tropical, warm water fish in your tank. The heater will keep your tank at a steady and controlled temperature. Correct Temperature range is very important for Fish and other living organisms in the tank. Absence of it leads to stress and diseases and can even cause death of pets. Use this temperature regulator, to give them an appropriately warmed and comfortable ha
• ✔ ENERGY-SAVING, INCLUDES AN INDICATOR LIGHT--- The temperature range in this accurate thermostat is 68 -93° Fahrenheit, which is the perfect recommended temperature range for a tropical fish tank. Once you set the temperature, leave the rest on the 100-Watt thermometer. It will automatically turn on and off to maintain the temperature. This automatic feature helps saving energy and thus saves you from large electricity bills. The indicator light on the heater indicates that the heater is on.