The Marina Submersible Pre‑Set Heater 300W delivers reliable, consistent heating for freshwater and marine aquariums up to around 300 litres (80 US gallons). Fully submersible and constructed from impact‑resistant glass, this heater is engineered for safety and durability. It features an easy‑access temperature set dial, a clear on/off pilot light, and a protective bumper guard to safeguard fish from direct contact.

Designed for simplicity and convenience, the heater includes a bracket with suction cups for secure installation, making it suitable for both new aquariums and as a replacement unit. Whether for tropical fish or marine setups, it provides stable water temperatures without hassle, helping maintain a healthy aquatic environment.

Key Features:

• 300 W submersible aquarium heater
• Suitable for tanks up to ~300 L (both freshwater and marine)
• Impact‑resistant glass construction with waterproof sealing
• Easy-access temperature control dial
• On/off pilot light for operating status
• Protective bumper guard for fish safety
• Bracket with suction cups for secure, adjustable mounting

The Marina 300W Submersible Heater is a dependable, no‑fuss solution to maintain stable water temperatures in medium to large aquariums. Its robust build and straightforward controls make it a great choice for both casual hobbyists and experienced aquarists alike.

Specifications:

• Power: 300 W
• Suitable aquarium volume: up to ~300 L
• Material: Impact‑resistant glass
• Mounting: Submersible with suction cup bracket
• Temperature control: Pre‑set dial
• Safety features: Bumper guard, waterproof sealing
• Included: Heater with suction-bracket and cable

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.