The Dennerle Heater Constant – 75W is a fully electronic, plug-and-play aquarium heater designed to maintain a fixed temperature of 25 °C (±1 °C). It is highly optimized for nano aquariums ranging between 55 and 75 litres in volume.

Key Specifications & Features:

• Power Output: 75 Watts.
• Dimensions: 116 mm (Height) × 46 mm (Width) × 16 mm (Depth).
• Cable Length: 1.42 metres.
• Fixed Temperature: Non-adjustable 25 °C, making it an ideal environment for most tropical fish (like Bettas), shrimp, and plants.
• Shatterproof Build: Manufactured with a break-proof special plastic housing to protect aquatic life from cracks or electrical leakage.
• Advanced Heating Element: Features a wide, flat profile that distributes heat evenly over a large surface area to eliminate dangerous hot spots.
• Smart Safety Protection: Equipped with an integrated electronic overheating chip to prevent dry-running or burnouts.
• Visual LED Indicator: Includes a red/green multi-colour LED system to visually signal whether the unit is actively heating or resting.
• Water Type Compatibility: Fully compatible with both freshwater and marine/saltwater aquarium setups.

Overview Summary:

• Ideal Tank Volume: 55 – 75Litres
• Temperature Range: Fixed at 25°C / 77°F (Not adjustable)
• Material Construction: Break-resistant plastic
• Mounting Hardware: Includes two suction cups