Aquael Inline Aquarium Flow Heater, 300 W External Mount with Precise Temperature Control

The Aquael Inline Flow Heater is a 300 W externally mounted aquarium heater designed to maintain water temperature without placing the heater body inside the display tank.

• For aquariums from 25 to 160 US gallons (95 to 606 L) — choose a heater matched to your tank capacity.
• Suitable for freshwater and marine aquariums — supports either type of aquatic setup.
• Temperature setting from 20°C to 33°C, accurate to ±0.25°C — gives you precise control of the target water temperature.
• Impact-resistant plastic housing — helps shield the heater from aggressive fish, large turtles, and accidental knocks.
• Built-in overheating prevention for hot weather — helps protect aquarium water from excessive heating.

This heater is made for aquarium keepers who want to manage water temperature while keeping visible equipment out of the tank. Its external mounting design keeps the heater outside the aquarium, while the built-in electronic thermostat and heating element work to maintain suitable conditions for aquatic life. The capacity range and freshwater or marine suitability help you assess whether it fits your setup.

Which aquarium size and water type is it made for?

The Aquael Inline Flow Heater is intended for aquariums holding 25 to 160 US gallons (95 to 606 L), in either freshwater or marine environments. Its high-efficiency heating element is designed to warm aquarium water quickly and respond to temperature changes, helping maintain stable conditions for fish and other aquatic inhabitants.

• Rated power: 300 W.
• Designed for external mounting rather than placement inside the aquarium.
• Compare your aquarium’s capacity with the stated range when choosing a heater.

How precisely can I set the water temperature?

The Aquael Inline Flow Heater uses a built-in electronic thermostat to monitor aquarium water temperature. Set the target between 20°C and 33°C; control accuracy is ±0.25°C. This lets you select a specific temperature within the heater’s range rather than relying on an unadjustable heating setting.

• The thermostat is built into the heater.
• The temperature range is adjustable.
• The heater is designed to respond to changes in water temperature.

What protects the heater during aquarium use?

The Aquael Inline Flow Heater has an impact-resistant plastic housing to help protect it from knocks and contact with larger or more forceful tank inhabitants. A built-in system is also designed to prevent overheating in hot weather. Its durable construction is intended for ongoing use in aquatic environments.

• Housing material: impact-resistant plastic.
• Protection considerations include aggressive fish, large turtles, and accidental bumps.
• Overheating prevention addresses hot-weather conditions.

This heater is suited to aquarium keepers who want temperature control from equipment mounted outside the tank, with a thermostat for setting a specific target. Its external design, adjustable temperature range, and protective housing make it a fit for freshwater or marine aquariums within its stated capacity range.