OASE HeatUp 300 Adjustable Aquarium Heater (300W)

Maintain a highly stable, uniform thermal environment inside large aquatic ecosystems with the premium OASE HeatUp 300. Designed and engineered by water management experts in Germany and precision-built in Italy, this commercial-grade 300-watt submersible thermostat heater delivers precise climate regulation for freshwater and marine/saltwater tanks up to 300 litres. The heavy-duty housing is manufactured entirely from high-strength, double-insulated quartz glass, offering superior thermal shock resistance to confidently handle rapid temperature shifts and continuous operational workloads under high-volume conditions.

The OASE HeatUp 300 utilizes an advanced bimetal internal thermostat switch that reacts smoothly to slight temperature changes, eliminating the rapid heat spikes or sudden drops that threaten delicate tropical fish, sensitive corals, and specialized aquatic plants. For absolute precision, it features a patented manual recalibration ring that permits you to adjust the temperature scale by up to +/– 3 °C, guaranteeing that your physical heating unit matches digital monitoring probes flawlessly. This versatile, slim profile unit functions perfectly as a standalone heater using the included suction mounting kit, or it can be integrated directly inside the built-in internal heater chambers of OASE BioMaster 600 and BioMaster 800 external canister filters to deliver a completely clean, hardware-free visual aquascape.

Specifications

• Power Consumption: 300 Watts
• Rated Voltage: 230 V / 50 Hz
• Dimensions (Diameter x Height): 23mm × 375mm
• Net Weight: 0.28 kg
• Power Cable Length: 1.5 metres
• Maximum Aquarium Capacity: 300 Litres
• Material Housing: High-strength, double-insulated quartz glass
• Water Suitability: Certified for Freshwater and Marine / Saltwater installations
• Manufacturing Origin: Made in Italy (German Engineered)
• Warranty: 3-Year OASE Manufacturer Guarantee

Key Features

• Patented Mechanical Calibration: Features an easy-to-use secondary manual correction collar to readjust the scale dial by up to +/– 3 °C for true thermal validation alongside digital testing gear.
• Canister Filter Integration Ready: Uniquely optimized to lock directly inside OASE BioMaster external canister filter systems, keeping bulky heating elements completely out of the main aquarium display.
• Sensitive Bimetal Technology: Provides highly responsive, continuous temperature monitoring and micro-cycling to stop sudden, stress-inducing environmental fluctuations.
• Thermal Shock Resistant Quartz Casing: Extra-thick quartz tube wall structure engineered to withstand physical impacts, handling, and steep temperature shifts without cracking.
• Visual Glow Status Monitoring: Features a highly clear integrated internal neon light that activates during live heating periods, facilitating rapid checks from across the room.