
Every tropical or marine fish tank requires heating to maintain the optimum temperature for your fish. High quality and economical heaters that are...
View full detailsLooking for cheap aquarium heaters? At Kellyville Pets, we have a wide range of aquarium water heaters for any aquarium size. The temperature of your fish tank water is an important factor in the comfort and well being of your fish. Unlike humans and warm-blooded animals, fish do not produce their own body heat. They must rely on the temperature of the water to maintain their body temperature. So if you’re looking for the best aquarium heaters, Kellyville Pets has your aquarium heating needs covered.
Knowing what type of heater to buy for your aquarium is only part of the picture. What aquarium heater size do I need? Picking the right heater for your tank may be a little tricky, so at Kellyville Pets, we have organised to have this aquarium heaters guide to help choose the correct watts per litre for your aquarium and correct temperature requirements!
Tank Size |
Heat 5ºC/9ºF |
Heat 10ºC/18ºF |
Heat 15ºC/27ºF |
5 gal/25 L |
25 watt |
50 watt |
75 watt |
10 gal/50 L |
50 watt |
75 watt |
75 watt |
20 gal/75 L |
50 watt |
75 watt |
150 watt |
25 gal/100 L |
75 watt |
100 watt |
200 watt |
40 gal/150 L |
100 watt |
150 watt |
300 watt |
50 gal/200 L |
150 watt |
200 watt |
two 200 watt |
65 gal/250 L |
200 watt |
250 watt |
two 250 watt |
75 gal/300 L |
250 watt |
300 watt |
two 300 watt |
The other way to select a heater is using the formula 1 Watt = 1 Litre. So once you know the size of your aquarium, it's easy to figure out the heater size.
Some fish such as Bettas (or fighting fish) are kept in small tanks or bowls. Mini tanks and fish bowls can be quite a challenge to heat properly due to the size of the tank so for these there are mini heaters available that sit outside and under the tank.
You have a heater, but now you are wondering where to put it. Should it be placed in the middle or on the side? Is a front or back placement preferable? Does it even matter? There are some simple, but important, guidelines for proper heater placement. We have aquarium heater suction cups to ensure proper placement.
The best location to place an aquarium heater is near the water flow, such as the outlet (or inlet) from the filter, or in the stream of a power head. Why? Because having water flowing directly past the heater more quickly and evenly disperses heated water throughout the tank.
If you have a tank that is over 40 gallons, consider having two heaters placed at opposite ends of the tank. The water temperature will be more uniform throughout the tank, and in the event one heater fails the tank will not be completely without heat.
Even under perfect conditions, problems can arise. One of the most common concerns is Aquarium heater breakage. If that is a concern for you, perhaps you should consider using a aquarium heater guard. Another heating challenge is during the summer when aquarium water temperature rises too high. Sometimes turning off the heater isn't enough to avoid dangerously high water temperatures, and additional steps are needed to keep your fish cool like using aquarium chillers. In the winter, the opposite problem can occur. This is especially true if your aquarium heater fails during the cold time of year, and steps must be taken to keep your fish warm.
Our range of Aquarium heaters online include Aqua one Heaters, Eheim Heaters, Aquamanta heaters and a range of Aquarium Thermometers.
There are three basic types of fish tank thermometers available: stick on the outside type, float/standing in the water type and digital thermometers. Different types of thermometers are better suited to different styles and sizes of aquariums. Regardless of the type you choose, we recommend using a thermometer for every tank, and record temperatures regularly to ensure the aquarium water temperature is stable and in the optimal range for your fish.
The 3 basic types are:Stick on thermometers are the most widely used thermometer in freshwater aquariums, often provided as part of the new aquarium package. They are usually referred to as LCD (Liquid Crystal Display) thermometers. LCD thermometers are accurate enough for general use, versatile, easy to use, and inexpensive.
Floating or standing thermometers are placed inside the aquarium, giving a more direct measurement of the water temperature. There are several styles, including ones that stick to the inside of the tank with a suction cup, ones that hang on the inside with a clip or ones that float around in the water. Like LCDs these can be placed wherever needed and in the case of large tanks, multiple thermometers may be used at either end of the tank. The standing models sink, which allows for a temperature reading near the bottom of the tank.
Digital thermometers consist of a probe that is placed in the tank which in turn connects to a digital display outside the tank. Some connect wirelessly, while others have a cord that physically attaches the probe to the display. Generally these models require batteries to operate, although some models plug into the wall. Some models provide an audible alert feature that will sound an alarm when the temperature falls below or above the desired range. Although these models are usually fixed in one spot, you can easily move them to take a reading in a problem area of the tank.
Every tropical or marine fish tank requires heating to maintain the optimum temperature for your fish. High quality and economical heaters that are...
View full detailsEvery tropical or marine fish tank requires heating to maintain the optimum temperature for your fish. High quality and economical heaters that are...
View full detailsEvery tropical or marine fish tank requires heating to maintain the optimum temperature for your fish. High quality and economical heaters that are...
View full detailsEvery tropical or marine fish tank requires heating to maintain the optimum temperature for your fish. High quality and economical heaters that are...
View full detailsEvery tropical or marine fish tank requires heating to maintain the optimum temperature for your fish. High quality and economical heaters that are...
View full detailsEvery tropical or marine fish tank requires heating to maintain the optimum temperature for your fish. High quality and economical heaters that are...
View full detailsKeep your Betta fish happy and healthy with the Betta Heater that fits under most Betta fish bowls.
The Fluval SEA Hydrometer provides an accurate and convenient method of measuring specific gravity and salt levels in marine aquariums. Compact and...
View full detailsAqua One Heater Protector protects your glass heaters and increases their life. It is suitable for glass heaters from 25W to 300W, and fits heaters...
View full detailsThese Aqua One LCD strip thermometers are cheap and effective. There is no faster way to check if your aquarium is safe and warm.
Perfect for Betta fish bowls. Ideal water temperature range 24-28 degrees.
The Aqua One ST3 sits on the outside of your aquarium and a sensor goes inside the water. A clear Liquid crystal display indicates the temperature ...
View full detailsDigital Thermometer 2.0 With the large, easy-to-read digital display of the JUWEL Digital Thermometer, you can easily keep an eye on the tempera...
View full detailsAquaEl Platinum Heaters are very precise as they are electronic. Being electronic makes them durable and long lasting as they do not contain mechan...
View full detailsAquael Platinum Heaters are very precise as they are electronic. Being electronic makes them durable and long lasting as they do not contain mechan...
View full detailsAquael Platinum Heaters are very precise as they are electronic. Being electronic makes them durable and long lasting as they do not contain mechan...
View full detailsAqua One Thermosafe Heater 50w - 21cm This Aqua One aquarium heater has shatter proof quartz glass making it very safe and is ideal for maintainin...
View full detailsAqua One Thermosafe Heater 100w - 25cm This Aqua One aquarium heater is ideal for maintaining the water temperature in your tank. With an easy to ...
View full detailsAqua One Thermosafe Heater 200w - 30cm This Aqua One aquarium heater is ideal for maintaining the water temperature in your tank. With an easy to ...
View full detailsAqua One Thermosafe Heater 300w -36cm This Aqua One aquarium heater is ideal for maintaining the water temperature in your tank. With an easy to r...
View full detailsAqua One Glass Hydrometer W/Thermometer Plain and simple but accurate and easy to read. Fits any aquarium Easy to read Floating Genuine Aqua One...
View full detailsWith water temperature being such a critical factor for the well-being of fish, it’s important to have a good thermometer. This Marina Floating The...
View full detailsEheim Thermocontrol Heater 300w 50cm 600-1000L Suits 600-1000LTR With the EHEIM precision heater your fish receive exactly the right temperature – ...
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