Aquarium Heater Hagen Marina 150W 27 cm immersion heater for freshwater and marine tanks

The Hagen Marina 150W aquarium immersion heater is a 27 cm glass-tube heater designed to maintain stable water temperature in both freshwater and marine tanks. With 150 watts of heating power, it is suited for small to medium aquariums and provides continuous, reliable warming to support the health and activity levels of aquatic species. The compact glass design allows discrete placement inside the aquarium and is suitable for unobtrusive mounting among décor or behind plants and equipment.

Advantages

This immersion heater delivers consistent temperature control with a stable output of 150 W, reducing thermal fluctuations that can stress fish and invertebrates. The glass tube housing is compact and minimally visible, enabling installation without significantly altering the tank layout. The unit is built for prolonged continuous operation and offers simple, direct heating suitable for both freshwater and marine environments. Its length allows mounting vertically or horizontally where space permits.

Suitable for

• Small to medium freshwater aquariums
• Reef and marine tanks of matching volume
• Species that require stable tropical temperatures
• General aquarium setups where discreet internal heating is preferred

Key specifications

• Power output: 150 watts
• Overall length: 27 cm
• Construction: glass immersion tube
• Compatibility: suitable for freshwater and marine aquaria
• Mounting: designed for internal placement and mounting inside the tank

How to use

Position the heater in the aquarium fully submerged and secure it according to the manufacturer's mounting method so it stays fixed and does not touch the glass sides directly under stress. Allow the heater to stabilize in the water and verify temperature with a separate aquarium thermometer. For initial setup, set the heater to the desired temperature and monitor the tank for several hours to ensure stable operation. Avoid switching the heater on or off while out of the water and follow standard safety precautions for electrical equipment near water.

Usage recommendations

Use a reliable external thermometer to cross-check the water temperature and place the heater where water circulation promotes even heat distribution. Regularly inspect the glass tube for cracks or damage, and replace the unit if any compromise is found. For marine tanks with sensitive livestock, perform gradual temperature adjustments and combine the heater with proper filtration and circulation to maintain stable aquarium conditions.