Aquael Ultra 25W Day & Night Heater The Aquael Ultra 25W Day & Night Heater is an advanced electronic aquarium heater designed to provide stable, natural water temperatures for small freshwater and tropical aquariums. Featuring Aquael's innovative Day & Night technology, the heater automatically creates gentle temperature differences between day and night, closely mimicking natural aquatic environments and reducing stress for fish and shrimp. Its Smart Heating System (SHS) intelligently adjusts heating power to maintain the selected temperature with an impressive ±0.25°C accuracy, ensuring consistent performance while reducing energy consumption. The shatterproof plastic housing makes it safe for use with fish, shrimp, turtles, and other delicate aquatic animals. Features Innovative Day & Night temperature simulation Precise electronic thermostat with ±0.25°C accuracy Smart Heating System (SHS) for efficient temperature control Fully electronic design with no mechanical thermostat Shatterproof plastic housing for added safety Built-in digital temperature display Uniform heat distribution Compact, slim profile suitable for nano aquariums Easy installation with dual-sided suction cup holder Specifications Brand: Aquael Model: Ultra Day & Night Heater Power: 25W Recommended Aquarium Size: 10–25 Litres Temperature Range: 20–33°C Accuracy: ±0.25°C Length: 16.3cm Material: Shatterproof plastic housing Suitable For: Freshwater and tropical aquariums Ideal For Betta aquariums Shrimp tanks Nano planted aquariums Small tropical fish tanks Freshwater community aquariums Note: Fully submerge the heater before switching it on and always place it in an area with good water circulation for the most accurate temperature control and even heat distribution.