Aquarium Fish Tank Heaters

Shop fish tank heaters and aquarium heaters at Finest Filters. We stock heaters for fish tanks in a variety of sizes, both internal and external aquarium heaters, and a wide range of models from leading brands. Browse our full collection today.

A fish tank heater is an essential piece of aquarium equipment to help you make sure the water in your tank is the optimal temperature for your fish or any other wildlife living in it. Many aquarium heaters are designed to sit in the tank itself, but you can also get external heaters that can attach to your tank from the outside. The best aquarium heater for you will depend on the size of your tank and how much other equipment is in there - alongside a fish tank heater, you’ll also need a pump and a filter as a minimum.

If you’re looking for a small fish tank heater, we have 25w aquarium heaters from Hepo and Hidom, which are both high-quality, trusted brands. These smaller models are suitable for tanks of up to 25 litres in size. However, if you’re looking for a larger aquarium heater, we stock models up to 500w for tanks of up to 500 litres. From heaters for freshwater aquariums to tropical fish tank heaters, there really is something for everyone at Finest Filters.

Discover the Hepo M7 Infrared Aquarium Heater range, check out the various Ista External Aquarium Heaters, or find the Hidom fish tank heater that’s right for you.

We also stock a selection of fish tank heater accessories, including suction cups and brackets to fix your aquarium heater in place. Shop the full Finest Filters collection of aquarium equipment or contact us if you have a question about any of our products.

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Hidom 100w ProHeat Quartz Aquarium Heater (HT-8100)

£0.00 - £0.00

£0.00

£12.49

£12.49 - £12.49

£12.49

Out of stock

You are purchasing a high quality quartz 100W aquarium heater suitable for aquariums up to 100 litres in size (HT-8100) Our easy adjustable heater...

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£0.00 - £0.00

£0.00

£12.49

£12.49 - £12.49

£12.49

Sold out

Ista External Aquarium Heaters

£0.00 - £0.00

£0.00

£45.99 - £56.99

£45.99

Low stock

The Ista External Heaters are the ideal solution to heat your tropical aquarium without having to have an unsightly heater in on display in the aqu...

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£0.00 - £0.00

£0.00

£45.99 - £56.99

£45.99

Hidom 150w ProHeat Quartz Aquarium Heater (HT-8150)

£0.00 - £0.00

£0.00

£12.99

£12.99 - £12.99

£12.99

In stock

You are purchasing a high quality quartz 150W aquarium heater suitable for aquariums up to 150 litres in size (HT-8150) Our easy adjustable heater...

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£0.00 - £0.00

£0.00

£12.99

£12.99 - £12.99

£12.99

Hidom 250w ProHeat Quartz Aquarium Heater (HT-8250)

£0.00 - £0.00

£0.00

£14.99

£14.99 - £14.99

£14.99

In stock

You are purchasing a high quality quartz 250W aquarium heater suitable for aquariums up to 250 litres in size (HT-8250) Our easy adjustable heater...

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£0.00 - £0.00

£0.00

£14.99

£14.99 - £14.99

£14.99

Submersible Preset Compact Aquarium Heater

£0.00 - £0.00

£0.00

£11.99 - £15.99

£11.99

In stock

Precise Comfort for Tropical Tanks: Submersible Preset Aquarium Heater Create a cosy and stable environment for your tropical aquarium with our Sub...

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£0.00 - £0.00

£0.00

£11.99 - £15.99

£11.99

Hidom Submersible Aquarium Quartz Glass Adjustable Heater

£0.00 - £0.00

£0.00

£18.99 - £24.99

£18.99

In stock

Submersible Aquarium Quartz Glass Heater With Adjustable Temperature Controller (50w to 300w) For Tropical & Marine Fish TanksOur submersible h...

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£0.00 - £0.00

£0.00

£18.99 - £24.99

£18.99

200w External Inline Aquarium Heater

£0.00 - £0.00

£0.00

£28.99

£28.99 - £28.99

£28.99

Out of stock

You are purchasing a high quality inline external aquarium heater.These heaters can be connected to the return pipe on your external canister filte...

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£0.00 - £0.00

£0.00

£28.99

£28.99 - £28.99

£28.99

Sold out

Ista Fixed Temperature Nano Heaters

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£0.00

£15.99 - £16.99

£15.99

Out of stock

The Ista Fixed Temperature heaters are compact and durable aquarium heaters for small nano tanks.These heaters have three temperature settings: 25°...

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£0.00 - £0.00

£0.00

£15.99 - £16.99

£15.99

Sold out

Hepo Glass Aquarium Heater HP-605 with FREE Thermometer and Heater Guard (25w-300w)

£0.00 - £0.00

£0.00

£9.99 - £13.49

£9.99

In stock

Finest-Filters Hepo HP-605 Bundle - Free Heater Guard and ThermometerHepo HP-605 Aquarium Heater, with FREE Heater Guard and stick-on Thermometer T...

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£0.00 - £0.00

£0.00

£9.99 - £13.49

£9.99

10w Micro Plastic Aquarium Fish Tank Heater Preset to 25 Degrees

£0.00 - £0.00

£0.00

£8.99

£8.99 - £8.99

£8.99

Out of stock

Our high quality pre-set submersible heater are completely submersible and suitable for use with small aquariums. These heaters are suitable for us...

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£0.00 - £0.00

£0.00

£8.99

£8.99 - £8.99

£8.99

Sold out

5w Micro Plastic Aquarium Fish Tank Heater Preset to 25 Degrees

£0.00 - £0.00

£0.00

£8.99

£8.99 - £8.99

£8.99

Out of stock

Our high quality pre-set submersible heater are completely submersible and suitable for use with small aquariums. These heaters are suitable for us...

View full details

£0.00 - £0.00

£0.00

£8.99

£8.99 - £8.99

£8.99

Sold out