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Aquarium Heaters

Essential for turning your coldwater fish tank into a tropical or marine aquarium. All have automatic heater thermostats, therefore ensuring a continuous even water temperature. Heater performance is measured in watts (units of electrical power).

Please select from the Aquarium Heaters below to buy at our best prices:

Sort by: Display: 29 Items
TMC V2 Therm 50 Watt Digital Aquarium Heater

TMC V2 Therm 50 Watt Digital Aquarium Heater

Suitable for aquariums up to 60 litres in volume. This digital heater makes it very simple to keep tropical or marine fish tanks at the correct temperature by incorporating advanced micro-processing technology. With a clearview LED display and digitally adjustable for precise temperature setting, it will monitor and display real time water temperature. The toughened glass heater element is fully submersible with a reinforced plastic heater element guard which helps to provide excellent heat diffusion. Temperature set range is 20 - 34 degrees centigrade with a tolerance of 1 degree. A thermal cut off is built in for extra safety. The slimline ergonomic design is easily installed with mounting brackets and suction cup cips supplied, and a 1.8 metre power cable.

£33.99
TMC V2 Therm 100 Watt Digital Aquarium Heater

TMC V2 Therm 100 Watt Digital Aquarium Heater

Suitable for aquariums up to 120 litres in volume. This digital heater makes it very simple to keep tropical or marine fish tanks at the correct temperature by incorporating advanced micro-processing technology. With a clearview LED display and digitally adjustable for precise temperature setting, it will monitor and display real time water temperature. The toughened glass heater element is fully submersible with a reinforced plastic heater element guard which helps to provide excellent heat diffusion. Temperature set range is 20 - 34 degrees centigrade with a tolerance of 1 degree. A thermal cut off is built in for extra safety. The slimline ergonomic design is easily installed with mounting brackets and suction cup cips supplied, and a 1.8 metre power cable.

£34.99
TMC V2 Therm 200 Watt Digital Aquarium Heater

TMC V2 Therm 200 Watt Digital Aquarium Heater

Suitable for aquariums up to 240 litres in volume. This digital heater makes it very simple to keep tropical or marine fish tanks at the correct temperature by incorporating advanced micro-processing technology. With a clearview LED display and digitally adjustable for precise temperature setting, it will monitor and display real time water temperature. The toughened glass heater element is fully submersible with a reinforced plastic heater element guard which helps to provide excellent heat diffusion. Temperature set range is 20 - 34 degrees centigrade with a tolerance of 1 degree. A thermal cut off is built in for extra safety. The slimline ergonomic design is easily installed with mounting brackets and suction cup cips supplied, and a 1.8 metre power cable.

£35.99
TMC V2 Therm 300 Watt Digital Aquarium Heater

TMC V2 Therm 300 Watt Digital Aquarium Heater

Suitable for aquariums up to 350 litres in volume. This digital heater makes it very simple to keep tropical or marine fish tanks at the correct temperature by incorporating advanced micro-processing technology. With a clearview LED display and digitally adjustable for precise temperature setting, it will monitor and display real time water temperature. The toughened glass heater element is fully submersible with a reinforced plastic heater element guard which helps to provide excellent heat diffusion. Temperature set range is 20 - 34 degrees centigrade with a tolerance of 1 degree. A thermal cut off is built in for extra safety. The slimline ergonomic design is easily installed with mounting brackets and suction cup cips supplied, and a 1.8 metre power cable.

£36.99
Hydor Theo -Shatterproof Aquarium Heaters NEW

Hydor Theo -Shatterproof Aquarium Heaters

Hydor Theo -Shatterproof Aquarium Heaters. One of the smallest and most compact heaters on the market. Specially treated Shatterproof glass makes this much safer and robust than conventional heaters. Will not explode even if taken out of water whilst operational, due to an automatic overheating control system. The heater Will then work perfectly if put back in the water. This is made possible due to our patented PTC heating film element inside the shatterproof tube. High tech micro-switch for exceptional heater durability and excellent temperature control. A proper temperature dial which clicks on each setting and has the temperature clearly marked on the dial area. Completely submersible, works in both horizontal and vertical position, can even function if buried under gravel!! UL and TUV approved.

From £20.99
AquaVital 25 watt heater SAVE
£16.50

AquaVital 25 watt heater

This heater enables you to convert a cold water aquarium to a tropical aquarium.

WAS £29.99
NOW £13.49
AquaVital 55 watt heater SAVE
£16.50

AquaVital 55 watt heater

WAS £29.99
NOW £13.49
AquaVital 100 watt heater SAVE
£16.50

AquaVital 100 watt heater

WAS £29.99
NOW £13.49
AquaVital 150 watt heater SAVE
£15.50

AquaVital 150 watt heater

WAS £29.99
NOW £14.49
AquaVital 200 watt heater SAVE
£15.50

AquaVital 200 watt heater

WAS £29.99
NOW £14.49
AquaVital 250 watt heater SAVE
£15.50

AquaVital 250 watt heater

WAS £29.99
NOW £14.49
AquaVital 300 watt heater SAVE
£15.50

AquaVital 300 watt heater

WAS £29.99
NOW £14.49
Juwel 100 watt Heater NEW

Juwel 100 watt Heater

Suitable for Rio 125 and Lido 120 Tanks. The Automatic Heater Thermostat is designed to fit perfectly into the Juwel Filter Systems, therefore ensuring an even water temperature within the aquarium. Heater 100 Watt / 230v.

RRP £31.95
£27.99
Juwel 50 watt Heater NEW

Juwel 50 watt Heater

Suitable for Rekord 600, Rekord 700, Rekord 800 and Korall 60. The Automatic Heater Thermostat is designed to fit perfectly into the Juwel Filter Systems, therefore ensuring an even water temperature within the aquarium. Heater 50 Watt / 230v.

RRP £31.95
£26.99
Juwel 200 watt Heater NEW

Juwel 200 watt Heater

Suitable for Rio 180, Rio 240, Vision 180 and Trigon 190 Tanks. The Automatic Heater Thermostat is designed to fit perfectly into the Juwel Filter Systems, therefore ensuring an even water temperature within the aquarium. Heater 200 Watt / 230v.

RRP £31.95
£28.99
Juwel 300 watt Heater NEW

Juwel 300 watt Heater

Suitable for Rio 300, Rio 400, Vision 260, Vision 450 and Trigon 350 Tanks. The Automatic Heater Thermostat is designed to fit perfectly into the Juwel Filter Systems, therefore ensuring an even water temperature within the aquarium. Heater 300 Watt / 230v.

RRP £31.95
£29.99
Replacement Hydor Heater Suction Cups NEW

Replacement Hydor Heater Suction Cups

Are you sick of your heater falling off the side of your aquarium? Over time suction cups can become solid and even brittle, it's best to replace these so that your heater can efficiently heat your fish tank.

RRP £4.99
£3.99
BiOrb Aquarium Intelligent Heater Free UK
Delivery*
NEW

BiOrb Aquarium Intelligent Heater

The biOrb Intelligent Heater is not only a neat and stylish heater unit but also consolidates all of your accessories into one power pod rather than using up multiple plug sockets.

RRP £68.79
£64.29
Marina Submersible Aquarium heater C25 NEW

Marina Submersible Aquarium heater C25

* Unbreakable
* Pre-set to 26c
* for aquariums upto 25l
* for glass, acrylic or plastic aquariums

£14.99
TMC Aqua Habitats H2 Therm Micro Heater 10 Watt

TMC Aqua Habitats H2 Therm Micro Heater 10 Watt

Power cable length of 1.8 metres and a 12 month guarantee. 10 Watts. For Aquariums up to 15 litres. A discreet and slimline micro heater which is designed for the TMC Aqua Habitats range of nano marine aquariums but can be used on any small fish tank. It is fully submersible with built in suction cups for quick and easy installation. With a sensitive thermostat set at 25 degrees centigrade and a tolerance or 1+ degree. Based on a room temperature of around 20 degrees centigrade.

RRP £15.89
£14.99
TMC Aqua Habitats H2 Therm Micro Heater 15 Watt

TMC Aqua Habitats H2 Therm Micro Heater 15 Watt

Power cable length of 1.8 metres and a 12 month guarantee. 15 Watts. For Aquariums up to 20 litres. A discreet and slimline micro heater which is designed for the TMC Aqua Habitats range of nano marine aquariums but can be used on any small fish tank. It is fully submersible with built in suction cups for quick and easy installation. With a sensitive thermostat set at 25 degrees centigrade and a tolerance or 1+ degree. Based on a room temperature of around 20 degrees centigrade.

RRP £17.89
£16.99
Hagen Aqua Minder NEW

Hagen Aqua Minder

RRP £21.89
£16.99
Fluval Edge Thermometer NEW

Fluval Edge Thermometer

Fluval Edge Digital thermometer. Accurate and easy to read Mounts easily on the out side of the aquarium

£1.69
Submersible Digital Thermometer NEW

Submersible Digital Thermometer

Fully Submersible accurate digital thermometer ideal for BiOrb and BiUbe aquariums. It's important to keep the water in your tank at a regulated temperature for the health of your fish.

RRP £12.10
£11.31
Easy Read Aquarium Thermometer NEW

Easy Read Aquarium Thermometer

This easy to read glass thermometer is perfect for keeping track of the temperature in your aquarium. Designed to fit the inside your tank and stick to the glass or acrylic.

RRP £3.99
£2.99
Algarde Heater Thermostat Holder

Algarde Heater Thermostat Holder

The Algarde Heater Holder is an adjustable strap holder which comes complete with attachment suckers. It will fit any size and make of heater thermostat.

£1.60
Marina C10 Nano Heater 10 Watt

Marina C10 Nano Heater 10 Watt

Suitable for fish tanks up to 10 litres the integrated thermostat is set to 26 degrees celcius. It will automatically shut off when the water temperature has reached 26 degrees. Safe for plastic, acrylic or glass aquariums and also suitable for saltwater and freshwater fish tanks too. Marina C10 Submersible Aquarium Heater which is safe, pre-set and unbreakable.

RRP £17.49
£16.99
Sort by: Display: 29 Items

FREE Mainland UK Delivery* on orders £50.00 or more
£4.95 delivery on orders under £50.00
£6.95 Next working day delivery
For a quote to ship outside mainland UK please email us
*Extra charges may apply for delivery to Highlands and islands.

Aquatics FREE UK DELIVERY on orders £40.00 or more £3.95 delivery on orders under £40.00.