The Dennerle Nano Heater Constant (50 Watt) is a fully electronic, non-adjustable aquarium heater designed to automatically maintain a fixed water temperature of 25 °C. It is purpose-built for small tropical setups, making it highly popular for housing species like Betta fish, small tetras, and shrimp.

Product Specifications:

• Power Consumption: 50 Watts
• Recommended Tank Size: 35 to 55 Litres
• Pre-set Temperature: 25 °C (±1 °C)
• Dimensions (H x W x D): 11.6 cm x 4.6 cm x 1.6 cm
• Housing Material: Shatter-proof special plastic
• Water Type Suitability: Freshwater and Marine (Saltwater)
• Power Cable Length: 1.42 metres
• Discreet and Space-Saving: The ultra-compact, flat profile allows the unit to be hidden easily out of sight behind plants, driftwood, or hardscaping elements inside nano tanks.
• Safe Plastic Construction: Unlike traditional glass heaters that can easily crack, the resilient plastic casing eliminates the risk of glass shattering inside your tank.
• Even Heat Distribution: Features a wide, flat heating element designed to spread warmth gently over a large surface area, preventing localized hot spots or accidental burns on curious fish and invertebrates.
• Smart Safety Cut-Off: Built-in electronic overheating protection turns the unit off automatically if it runs dry, preventing aquarium damage during water changes.