The Fluval T300 Fully Electronic Heater offers precise and reliable temperature regulation for freshwater aquariums up to 80 gallons (300 litres). With a 300-watt output and advanced electronic construction, it ensures stable water temperatures and avoids unsafe fluctuations. This item is tested, used, and in good working condition.

Featuring a 360° indicator ring that displays RED when actively heating and BLUE when the set temperature is reached, the T300 provides clear visual feedback from any viewing angle. It includes an integrated heater guard to prevent breakage and an auto shut-off function when out of water for added safety. The large grip dial allows easy temperature adjustment between 22°C and 32°C. Its fully submersible design means it can be installed vertically or horizontally to suit your tank layout.

Key Features:

• 300W heater suitable for aquariums up to 300L / 80 gallons
• Advanced electronic construction for accuracy and performance
• 24/7 temperature monitoring to prevent fluctuations
• 360° visual indicator ring (RED = heating, BLUE = set temp reached)
• Auto shut-off when out of water
• Integrated heater guard for added protection
• Adjustable from 22–32°C via large grip dial
• Fully submersible—vertical or horizontal installation
• Tested used item in good condition

This T300 heater delivers dependable performance with user-friendly controls and enhanced safety features, making it a practical solution for maintaining stable conditions in larger freshwater tanks.

Specifications:

• Model: T300
• Power: 300 Watts
• Suitable for: Freshwater aquariums up to 300L / 80 gallons
• Temperature Range: 22–32°C
• Indicator: 360° LED (RED/BLUE)
• Condition: Used – tested, good condition

Aquacadabra acts as credit broker/intermediary and not as a lender.

Klarna's credit products are provided by Klarna Bank AB, which is authorised and regulated by the Swedish Financial Services Authority, with limited supervision by the Financial Conduct Authority. More information can be found here.

Newpay finance options are provided through Deko’s platform by NewDay. P.D. Aquatics Ltd, t/a Aquacadabra is an Introducer Appointed Representative of Pay4Later Ltd, t/a Deko, which is authorised and regulated by the Financial Conduct Authority (ref no 728646) and is a credit broker, not a lender. NewDay Ltd is authorised and regulated by the Financial Conduct Authority (ref no 690292) and is authorised by the Financial Conduct Authority under the Payment Services Regulations 2017 for the provision of payment services (ref no 555318). More information can be found by clicking the newpay option above, or in the Newpay FAQs.

We really want you to be happy with the product that you've received. If however, when the goods arrive they're not what you want, then no problem - we have a 60 day no quibble return guarantee. Just let us know that you're going to return the item(s) by contacting us(stating your Order Number) and complete the returns packing slip that will have been included with your delivery. This will help us to quickly identify the item that you have returned (unopened and unused) - and we'll put a refund through for you.