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You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
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We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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Red: Heating
Green: Temperature constant





Aquarium Heater fully immersed in water, please place it in an area with greater water flow to promote temperature equilibrium


Q1: What size aquarium is the SR-308 Mini LED Display Aquarium Heater suitable for?
A1: The SR-308 aquarium heater is suitable for 1-25-gallon fish tanks depending on the wattage selected. The 25W model is ideal for 1-6 gallon aquariums, the 50W model for 5-15 gallon tanks, the 75W model for 7-20 gallon tanks, and the 100W model for 10-25 gallon aquariums.
Q2: Can this aquarium heater be used in both freshwater and saltwater aquariums?
A2: Yes. The SR-308 Mini LED Display Aquarium Heater is designed for both freshwater and saltwater aquariums. It is suitable for tropical fish tanks, breeding tanks, fry rearing, and other aquarium environments that require stable water temperatures.
Q3: Does the SR-308 aquarium heater have temperature display and control features?
A3: Yes. The heater comes with an external LED temperature controller that continuously displays the current water temperature. Users can easily adjust the temperature using the +/- buttons and switch between Celsius (℃) and Fahrenheit (℉) units.
Q4: What safety features does the SR-308 aquarium heater have?
A4: The SR-308 aquarium heater includes multiple safety protections, including overheat protection and dry-burn protection. When the water temperature exceeds 99°F, the heater automatically stops heating and displays "HH" on the controller. It also stops heating when the water level is too low or the heater is out of water.
Q5: How do I install the SR-308 aquarium heater in my fish tank?
A5: Installation is simple. Fully submerge the heater in water and secure it inside the aquarium using the included suction cups. For better temperature distribution, place the heater in an area with good water circulation.
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