Nicrew Submersible Aquarium Heater For Fish

If you are looking to prevent temperature fluctuations in an aquarium up to 250 litres, this submersible aquarium heater offers controlled, adjustable heating for general fishkeeping. The external temperature controller lets you set and monitor water temperature without repeatedly handling the heater, which helps keep conditions steady during setup, seasonal changes or after maintenance.

Rated at 300W and designed for both freshwater and saltwater tanks, the heater uses thermal shatter-resistant quartz glass for improved durability and reliability. It includes automatic overheat protection that switches the unit off above 37°C, reducing the risk of accidental overheating. The compact design can be mounted vertically or horizontally with the supplied suction cups, and its energy efficiency class A indicates relatively efficient operation.

Practical guidance: this heater suits owners of medium to large aquaria who need reliable, continuous temperature control. Use the external controller to fine-tune temperature during acclimation or when running other equipment. Position the heater where there is steady circulation to avoid local hot spots, and continue routine monitoring even with the safety cutoff in place.

Key Features

• External temperature controller – precise adjustment and easy monitoring without removing the heater
• 300W capacity for aquariums up to 250 litres – suitable power for medium to large tanks
• Overheat protection – automatic shutoff above 37°C reduces overheating risk
• Thermal shatter-resistant quartz glass – durable construction for aquarium use
• Compact mounting options – fits vertically or horizontally using supplied suction cups; energy efficiency class A

Frequently Asked Questions

What tank sizes is this heater suitable for?

This BH-300 model is designed for aquariums around 200-300 L. The product title also lists suitability up to 250 L. Check your tank capacity before buying.

Can this heater be used in freshwater and saltwater tanks?

Yes. The heater is advertised as suitable for both freshwater and saltwater aquariums, providing precise temperature control for either environment.

How do I install and position the heater in my aquarium?

Install vertically or horizontally using the included suction cups. The sleek, compact submersible design allows easy placement and connection to the external temperature controller.

Does it have safety features to prevent overheating?

Yes. It automatically turns off if water temperature exceeds 37℃, providing overheat protection to help prevent harm to your fish.

What is the construction, power rating and energy efficiency?

Constructed from thermal shatter-resistant quartz glass and rated 300W, the heater is energy efficiency class A for reliable, efficient heating.

Check the recent prices for NICREW 300W Submersible Fish Tank Heater below.