Aquarium heater thermostat sera SE-08750, 300 W, temperature range 18–32 °C

The sera SE-08750 inline aquarium heater thermostat is a 300 W heating unit designed to maintain stable water temperature in freshwater and marine aquariums. Compact in size, it is intended for integration with filtration or circulation systems and offers an adjustable temperature range from 18 to 32 °C for precise control. The heater features shock-resistant quartz glass and a protective grid to reduce the risk of direct contact with the heating element, plus a visible on/off indicator for simple function monitoring.

Advantages

The compact inline design allows installation inside or near an external filter loop, saving space within the display tank while ensuring consistent heat distribution. Shock-resistant quartz glass increases durability and thermal stability under continuous use. A precision protection circuit helps maintain set temperatures and reduces thermal fluctuations. The visible function lamp provides a clear on/off indication, and the protective grid prevents direct contact with the glass surface for improved safety.

Suitable for (tasks / use cases)

• Maintaining stable temperature in medium to large freshwater aquariums
• Heating marine aquaria with corals and temperature-sensitive invertebrates
• Integration with external filters, canister filters and circulation systems
• Use in planted aquaria where consistent temperature supports plant growth

Key specifications

• Power: 300 W
• Adjustable temperature range: 18–32 °C
• Construction: shock-resistant quartz glass heating element
• Protective features: protective grid and precision protection circuitry
• Mounting: inline/external integration compatible with filter lines
• Indicator: visible on/off function lamp

How to use

Install the heater inline with the circulation or filtration line following the flow direction and manufacturer safety guidelines. Set the desired temperature within the 18–32 °C range using the adjustment control and check the function lamp to confirm the device is operating. Allow the system to reach equilibrium and verify the aquarium thermometer readings at multiple locations to ensure uniform temperature. Regularly inspect the protective grid and glass surface for deposits or damage and clean according to maintenance instructions.

Usage recommendations

For reliable temperature control, place the heater where water flow is steady to promote even heat distribution. Use an independent aquarium thermometer to confirm set temperature and perform periodic checks. Avoid dry operation and ensure the heater remains submerged or in the prescribed inline position within the flow. If integrating with automated controllers or additional equipment, verify compatibility and wiring according to device manuals.