Last updated: 16/10/2022

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A aquarium heater is a device that keeps the water in your fish tank at an optimal temperature. The ideal range for most tropical freshwater and saltwater tanks is between 78-82 degrees Fahrenheit (25 to 28 Celsius). If you live in a colder climate, or if you have special needs such as breeding certain species of fish, then it may be necessary to use two heaters on opposite ends of the tank.

Aquarium Heater: Bestsellers and current offers in the UK

The best aquarium heater in the UK: Our selection

Tropical Aquarium Heater – Precise, Reliable, Safe

Looking for a precise and reliable heating control for your tropical aquarium? Look no further than this high performing heater. Extra safe, double insulated and fully submersible, this heater is made with heat and shock resistant glass. The positive click-control makes it easy to adjust the temperature precisely, but as the heater is already set to 24degc you might not find you need to. This 300 w model is perfect for aquariums from 135 to 270 litres. Heater dimensions: 35.5 cm x 2.5 cm x 2.5 cm

Aquarium Heater: Perfect for Marine & Fresh Water

This innovative aquarium heater is perfect for both marine and fresh water/tropical fish tanks. The temperature range is easily adjustable via a simple knob on the top of the unit, with light indication on the side to let you know when it’s working. The package includes rubber suckers with clips to secure the heater to the side of your tank. It’s fully submersible and comes factory fitted with a UK plug and 1.5m cable length.

Heating your freshwater or marine aquarium has never been easier.

If you are looking for an aquarium heater that can be used in both freshwater and marine aquariums, then the hepo hp-605 range is ideal for you. These heaters come with a 3 pin standard uk plug and a 1.5 metre cable, and will automatically regulate the aquarium temperature. You can set the heater to heat between 16 and 32 degrees, making it perfect for keeping your fish happy and healthy.

The Perfect Aquarium Heater: u-picks

If you’re looking for an aquarium heater that is both effective and safe, the u-picks thermostatic aquarium heater is the perfect choice. With dual sensors for better protection, this heater will automatically stop heating when the water temperature gets too high, and start heating again when it gets too low. The thick explosion-proof quartz glass protects your fish from being scalded, while the dual LED digital display makes it easy to see the current water temperature and set temperature. This 100w heater is suitable for 20-200l aquariums and comes with a convenient external temp controller so you can adjust the temperature without having to take out the heater.

Aquarium Heater: Frequently asked questions

What types of Aquarium Heater are there and what determines a good product?

There are two main types of aquarium heaters, submersible and external. Submersible heaters sit in the water inside your tank while external ones hang on the outside of it. The most popular type is a submersible heater because they’re very easy to use and install but there are some benefits to using an external one too so let’s take a look at both.

Submersible Aquarium Heaters

There are a few things to consider when buying an aquarium heater. First, you need to know the size of your tank and how much heat it will require. Next, you want one that is easy to use and install with minimal effort on your part. Finally, look for something durable enough so it can last through years of service without needing replacement or repairs in between uses.

Who should use a Aquarium Heater?

Aquarium Heaters are used to keep the water temperature in your aquarium at a constant level. This is especially important for tropical fish, which require stable temperatures of around 75 degrees F (24 C).

Based on what criteria should you buy a Aquarium Heater?

The first thing to consider when buying a Aquarium Heater is what type of fish you have. Different types of fish require different temperatures for their comfort and survival, so it’s important that the heater matches your tank temperature requirements. For example, tropical fish like goldfish need water at around 75 degrees Fahrenheit while coldwater species such as trout can survive in 50 degree waters. You should also take into account how large your aquarium is since larger tanks will naturally be more difficult to heat than smaller ones; this means you may need multiple heaters depending on the size of your tank or even one with adjustable settings if possible (such as an external thermostat). Finally, make sure that any Aquarium Heaters are compatible with whatever filtration system you use – some filters produce too much current which could damage them.

You should look out for the size of your tank, as well as whether or not it has a built-in thermostat. If you have an aquarium that is smaller than 55 gallons, then you will need to get one with a built-in thermostat so that it can maintain the right temperature in order to keep your fish alive and healthy. The second thing you want to do when comparing different heaters is check how much wattage they use per hour because this determines how expensive they are going to be on energy bills each month.

What are the advantages and disadvantages of a Aquarium Heater?


Aquarium heaters are used to maintain the temperature of your aquarium at a constant level. This is important for fish and plants that require specific temperatures in order to thrive.


The main disadvantage of a Aquarium Heater is that it can be dangerous. If the heater malfunctions and overheats, there’s always the risk of fire or explosion. It also requires electricity to run which means you need to keep an eye on your power bill each month.

Shopping Guide: Everything you need to know

Which brands and manufacturers are represented in our review?

In our review, we present products from various manufacturers and suppliers. The list includes products from the following brands and manufacturers, among others:

  • Interpet
  • Hepo
  • J B A

What is the price range of the featured products?

The cheapest Aquarium Heater in our review costs around 10 pounds and is ideal for customers who are conscious about their money. However, those who are willing to spend more money for better quality can also spend around 44 pounds for one of the more expensive products.