Best Aquarium Heaters for 2023

Providing some of the most sought after and premium quality aquarium heaters on the market, Fluval’s electronic heaters are guaranteed to conjure up a tropical paradise in your very own home!

These models from Fluval’s E series are currently their most technologically advanced heaters yet and come in varying degrees of power, from 50 to 300 watts, meaning you can power up pools from 20 to 300 litres!

Equipped with a smart microprocessor monitoring system, Fluval’s product accurately records your tank’s temperature with dual sensor probes, while a precise temperature setting lever allows you to adjust the exact temperature in 0.5 degree increments.

The combination of these features means there’s no way you’ll never not know the exact temperature of your tank water, with an LCD temperature display constantly keeping you on top of your tank’s heating at all times. Colour changes on the screen will indicate any drops or rises in temperature, and flashing risk screens will warn you of any critical spikes or chills.

It’s everything you need to ensure the safety and well-being of your aquarium inhabitants!

An easy-access temperature controller. Easy to read temperature settings. An impact-resistant glass design in case your fish happen to get a bit giddy when swimming.

These are just some of the highlights of this mini heater. There is also a bumper guard for their safety, as well as a completely waterproof sealing to ensure it stays working throughout its lifespan.

Despite its small size, it is mighty. The 50w Marina Submersible Aquarium Heater provides reliable heating for fresh or saltwater aquariums up to 38 litres, so you don’t need a huge heater which takes up all the space to ensure your fish are kept in the correct heated waters.

The power cord is 1.8m long, which is generous as well.

This heater may be mini, but don’t worry if you have to get something a little bigger and more powerful – the same heater is available in levels up to 300W, or as low as 25W too.

An advanced heater in an unbreakable plastic casing, this heater has a high-precision electronic thermostat, a built-in thermometer, and an overheat alarm.

Because the casing is unbreakable, it is great for tanks with large fish or animals such as turtles, and it will also protect animals from the heat and eventual burns when getting too close. It is easy to use with a one-touch system, using a single control button with a range of LEDs around the edge which tell you everything you need to know temperature-wise.

This heater operates with exceptional accuracy (+/- 0.25° C) so a constant temperature is maintained. The heat can range between 20 and 33 °C, which means it is great for treating diseases such as white spots. A built-in system will prevent it from overheating too.

If you always feel like you deserve a little extra cherry on top of your cake when you make a purchase, there’s no better aquarium heater goodie bag than this HITOP HP-608 offer, with added sucker cup and stick-on thermometer included!

And forgetting the bonus items for just a moment, the device itself ain’t half bad either!

Safe for humans and animals, HITOP’s device boasts a quartz glass material that is actually 33% thicker than the standard seen in most tank heaters, rendering this model completely explosion proof! (That unfortunately just means it’s protected from the heater itself malfunctioning, not a grenade Mr. Bond!)
A 10-slot multi-branched ceramic frame also takes up just an astonishing 11 inches of room, a smaller use of space than most brands, yet still packing a huge power punch when it comes to heating up your tank!

With 100, 200 and 300 watt models available, HITOP covers a wide range of tank sizes from 40 – 500L, making it suitable for all kinds of fish and plant life. A high precision control system also allows more accurate adjustment of temperature and this model has a standard range of 20°C – 34°C.

This makes it the perfect choice for fresh and marine water fish, and would be a welcome addition to the flora and fauna of any aquarium!

A heating system designed for tropical fish favourites, the Interpet Deltatherm is a double insulated and fully submersible model made with the highest quality components.

Featuring a quick access, top view temperature control, it’s easier than ever to readjust your settings without ever having to remove your device from the tank, and a handy on/off light indicator system lets you know when your heater is in operation.

The heater itself also has a fantastic temperature range of 16-34 degrees Celsius, meaning despite it’s target fishy demographic, it could also make a fine water warmer for marine and freshwater fish who prefer slightly cooler conditions to their tropical cousins.

One downside of this system though is that to take truly accurate readings, it needs to be positioned at a diagonal angle, which can obviously be unsightly within your setup if aesthetics are important to you.

Still, as long as you’ve got an Easter Island Head to hide it behind, it’s definitely a great option for all types of fish!

Hidom’s HT range aquarium heaters have been designed and manufactured by industry veterans and this quartz thermostat heater is their latest in a long line of high quality products.

If you’re someone who is quite obsessed with getting an even distribution of heat across the breadth of your tank, Hidom’s quite frankly bizarre range of available wattage options means you can get as specific as you want according to the size of your aquarium.

And with those wattages including a pitiful 25w model and a conversely terrifying 500w version, Hidom is undoubtedly the best choice for very small fish tanks with very few pets inside as well as full scale mammoth ones with more visible fish than water.

A temperature range of 20 – 34 degrees Celsius makes them a great choice for tropical, marine and freshwater fish and a 1.5mm thick glass structure ensures a quick and efficient heat transfer rate.

Now that’s watt we call an aquarium heater!

…We’ll see ourselves out.

This Thermostat Aquarium Heater from Hidom’s HT series offers high performance water warming for tanks of various sizes thanks to its range of wattage options.

Utilising the latest in aquarium heating technology, this submersible device includes a simple set-up temperature scale that keeps your tank topped up with warmth and is perfectly suitable for both freshwater and marine tanks, with a temperature range of 16 to 32°C.

Fantastic for keeping your fish den a visual delight to behold, the heater’s 1.5 metre mains cable means you’ll have plenty of room to manoeuvre when positioning the device within the aquarium, and heavy duty suckers also allow you to provide firm attachment to the side of the tank, keeping it well out of the way.

Alternatively, if visuals aren’t a necessity, the cable also just offers you a great chance to position your probe in a spot which is going to give the most even spread of heat throughout, keeping all your fishes equally happy!

For additional safety, it’s extra thick, heat and shock resistant glass structure ensure the core of the heater is also well covered, rendering it harmless should your fish come into contact with the device itself.

Safe and secure, what more could you want?

This is a slim and compact heater pad with a continuous heating output, which is great if your fish need the warmest possible water.

It always heats to 5°C above ambient room temperature, and you’re pretty flexible in terms of placement. Pop it under the gravel, tuck it away behind the filter or just leave it on display if you aren’t concerned about the look for optimum results.

An aquarium thermometer is included so you can monitor the water temperature continuously, and it is the ideal solution for small aquariums up to 20 Litres (4.4 gallons). There are two models available – this 15W, but also a smaller 7W which can cope with tanks up to 12L.

The EHEIM adjustable heater is an ultra-modern electronic thermal device that utilises the best available technology of today, while staying true to the classic hanging in the water rod design of old.

Coming in a large range of different wattages, this simple enough looking design is actually constructed with a jacket material made from special laboratory glass, increasing the heating surface and serving as a kind of heat shield for the device. This ensures the optimum amount of heat is evenly dispersed around the tank, with larger wattages ensuring even the biggest tanks can be taken care of.

A precise control dial at the top of the heater means changing the settings can be somewhat fiddly and of course, wet, however it can still conduct temperatures in an impressive range of 18 to 34 Degrees Celsius.

So for those who like their heaters to be a quick and easy set-up, it’s a good choice for tropical fish.