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Aquarium Heaters

Aquarium Heater by Wattage
7.5 to 25 Watt Heaters
(2-8G Tanks)

200 to 250 Watt Heaters
(55-80G Tanks)


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50 to 75 Watt Heaters
(15-25G Tanks)

300 to 1000 Watt Heaters
(80-325G Tanks)
100 to 150 Watt Heaters
(30-50G Tanks)

Heaters without Controllers
Aquarium Heaters: AquaTop Digital Aquarium Heaters: AquaTop Glass
25 Watt to 450 Watt Aquarium Heaters
The AquaTop D1HT & D2HT series aquarium heaters come equipped with a highly visible dual temperature display, an easy to use temperature control button, and a separately attached temperature sensor.
50 Watt to 300 Watt Aquarium Heaters
The AquaTop Glass GH Series heaters maintain a constant and stable temperatures. These fully submersible glass heaters offers simple and easy installation with the use of the included suction cups. With the highly visible temperature setting, they are easy to set and adjust to the desired temperature with the use of the temperature adjustment knob.
Aquarium Heaters: AquaTop Nano Aquarium Heaters: AquaTop Titanium
25 Watt Watt Aquarium Heater
AquaTop's 25 Watt Nano Aquarium Heater is perfect for Nano aquariums up to 8 gallons. It has a built-in precise electronic thermostat which is pre-set to 77 degrees Fahrenheit and it automatically shuts down when the target temperature is reached.
500 Watt & 800 Watt Aquarium Heaters
The AquaTop Titanium Aquarium Heaters come without the controller or the temperature probe. You can either purchase the AquaTop DDC-800 Electronic Heater Controller or use a different controller.
Aquarium Heaters: Ebo Jager & Eheim Aquarium Heaters: Hydor In-Line
50 Watt to 250 Watt Aquarium Heaters
Eheim Aquarium Heaters feature a TrueTemp dial with readjustment ring that allows the user to calibrate the heater for a precise temperature reading. The thermo safety control will automatically shut off the heater if the tank runs dry.
200 Watt & 300 Watt In-Line Aquarium Heaters
These Hydor In-Line Heaters are installed, as the name suggests, in-line with a canister filter or external pump. This option appeals to those who don't want to see a heater in their tank or use up space for a heater in their sump.
Aquarium Heaters: Hydor Slim Aquarium Heaters: Hydor Theo SALE!!
7.5 Watt Aquarium Heaters
For 2 to 5 gallon tanks we carry the Hydor 7.5 Watt Slim Heaters. These micro heaters are a great choice for 2 to 5 gallon bettas, bowls and micro tanks.
50 Watt to 400 Watt Aquarium Heaters
The Hydor Theo Aquarium Heaters are fully submersible, shatter-proof glass aquarium heaters. Maximum security: THEO is shock resistant thanks to the PTC heating element and the shatterproof glass tube.
Aquarium Heaters: JBJ True Temp Titanium SALE!! Aquarium Heaters: Lifegard Aquatics
150 Watt to 1000 Watt Aquarium Heaters
The JBJ True Temp Titanium Heating System is the most complete heating system to date with the most advanced features that set it apart as the leading heater for professional hobbyists. 100% Digital Operation.
25 Watt to 300 Watt Aquarium Heaters
These submersible shatterproof quartz heaters are safe for freshwater and saltwater tanks. Easy to set thermostat a LED power indicator light showing operation. All heaters are UL listed with a thermal protection shutoff switch.
Aquarium Heaters: Marineland Precision Aquarium Heaters: Marineland Visi-Therm SALE!!
50 Watt to 400 Watt Aquarium Heaters
The Marineland Precision Submersible heaters comes in eight sizes from 50 Watt to 400 Watt. Comes with built-in thermal safety switch.
25 Watt to 300 Watt Aquarium Heaters
Marineland Visi-Therm Submersible Heaters: Gives precise control to accurately set temp to + or - 1F with every "click".
Aquarium Heaters: ViaAqua Titanium & Quartz SALE!!
50 Watt to 300 Watt Aquarium Heaters
The ViaAqua Titanium Heater heating element is manufactured of pure titanium that will not crack like conventional glass heaters. The remote thermostat allows you to alter the temperature without getting your hands wet. The Via Aqua Quartz Heaters are a great value.

Aquarium Heater General Info
Most aquariums require a heater to maintain a consistent water temperature. Aquatic life such as fish, coral, and other invertebrate need to be kept at certain stable temperatures. What temperature should you keep your aquarium at?

Different aquarium fish and invertebrates will need different temperature requirements. Fish, corals, and other invertebrates come from many different environments all over the world. A successful aquarium must replicate the environment they are from as closely as possible.

The temperature for tropical fish should be kept close to 78F/26C. Marine aquariums should also be kept at 78F/26C.

Some fish that are referred to as tropical are really subtropical. Some of the more common fish that fall in the subtropical category are: Cardinal Tetras, White Cloud Danio, Rosey Barbs, Variatus Platy, Dragon Gobies, and some marine Blennies. These subtropical aquariums should be kept at 72F/22C.

Discus aquariums should be kept at 82F.

Goldfish, Sunfish, Bass, and Kio are coldwater fish. Coldwater aquariums are usually kept anywhere from 55F to 68F. An aquarium heater is typically not necessary for these fish, but aquarium chillers are used instead.

If your aquarium inhabitants are not kept at the proper temperature they could suffer, get sick, or even die. Your aquarium can give you signs that it needs a heater. The most common sign is sick fish or lethargic fish. The most common disease is Ich (Ichthyophthirius multifilis), which can easily break out and become visible because the aquarium temperature has become too low. If you are not sure the heater you have is keeping the correct temperature use an aquarium thermometer to see if the heater is working correctly.

Which aquarium heater do you need? The basic rule of 3-5 watts per gallon is recommended for keeping your aquarium at optimal temperatures. With cold rooms you will need more watts per gallon. For example, if you house is 75F and you need to heat a 55 gallon marine aquarium, then a 200 watt heater would usually suffice. However, if the room is 68F you may need a 300 watt heater.

Using more than one heater is advisable because heaters can fail and having a backup heater will keep your tank temperature from fluctuating wildly if one heater stops working.

If you do not need a heater all year long then remove, clean and store the heater when it is not needed to prolong its life.

When changing the temperature of your tank, proceed slowly. Do not turn a new heater on for at least 15 minutes so the heater may reach the same temperature as the water. This is a good idea for all heaters and especially important with glass heaters since they can crack if there is a massive temperature difference.

Sudden temperature changes will also stress fish and corals. Change the aquarium temperature over a period of days or even weeks for best results.

The dial on an aquarium heater does not change how powerfully the heater heats, it only tells it when to turn on and off. If your heater is on and your tank isnít warming to 78 when your heater is set at 78, you donít need to turn up the heater. You need a bigger heater.

There are different heaters to be used in different applications. The most common is the submersible dial-in heater. These are usually made of strong glass or sometimes titanium metal. These heaters can be placed completely in the aquarium near an area with high flow.

If you have a sump, or refugium the heater will do well if it is placed horizontally in the lower areas.

Inline heaters, such as the Hydor In-Line, are plumbed into the water line of the aquarium filtration. They work well plumbed into the return line of common canister filters. You can also use a Lifeguard Aquatics Heater Module to put your heater in line with your filtration.

For tanks less than 5 gallons try an easy to use a preset miniheater such as the Hydor Slim Heater.

For larger tanks over 100 gallons, or when delicate temperature control is required, consider using a heater with a separate controller. JBJ True Temp Titanium Heating Systems are a good choice.

Separate controllers, such as the American Marine Pinpoint Temperature Controller, can be added to any heater to make it more precise and accurate. They also provide redundancy. When using a stand alone heater and a controller both the controller thermostat and the heater thermostat have to fail for the heater to overheat your tank.

If you have aggressive or delicate fish you might consider a JBJ True Temp Heater Holder to protect both the heater and the fish. Some fish, like eels, knifefish, stingrays, and anemones, like to rest against the heater--and a caged heater will protect these fish.

What Makes a Good Heater?

The build quality of a heater can make a significant difference in a heaterís cost. You usually get what you pay for. Cheap glass heaters have been known to crack and electrocute fish or leach toxic metals into the aquarium water. High quality heaters are made of Pyrex quality glass or titanium to prevent cracking.


Some heaters are more precise than others. The most precise heaters use digital temperature controller (e.g. JBJ True Temps, ViaAqua Titanium & AquaTop Titanium Aquarium Heaters with Digital Controllers). Precise heaters are good at turning on at the exact same time every time. If you set your heater at 78 and it always turns on when the temperature reads 77.7, you have a precise heater. If your heater turns on somewhere between 78 and 76 then the heater is not very precise.

Accuracy is different than precision. If when you set your heater to 78 and the tank warms to 84 your heater is not very accurate. The most accurate heaters, Eheim Heaters and JBJ True Temp Heaters, can be calibrated. It is common for cheap heaters to be 2-3 degrees off. With heaters that can be calibrated, just measure the temperature after adding the heater and adjust accordingly.


Different Types of Heaters
For 2 to 5 gallon tanks we carry the Hydor 7.5 Watt Slim Heaters. These micro heaters are a great choice for 2 to 5 gallon bettas, bowls and micro tanks. For other small tanks we have the Lifegard Aquatics 25 Watt, AquaTop 25 Watt Pre-Set Nano aquarium heaters.

The Eheim Aquarium Heaters are very precise and come in 50 watt, 75 watt, 100 watt, 150 watt, 200 watt and 250 watt sizes. These heaters are made of Pyrex glass and can be calibrated for better accuracy.

The Hydor 200 Watt and Hydor 300 Watt In-Line Aquarium Heaters are placed inline with a water line outside the tank. This serves the purpose of removing a potentially unsightly heater from the tank.

The Hydor Theo Aquarium Heaters are made of shatter-proof glass and can be completely submerged. They come in 50 watt, 100 watt, 200 watt, 300 watt and 400 watt versions.

The Marineland Precision Submersible Heaters feature a thermal safety switch to prevent heater failure during operation.

The ViaAqua Titanium Heaters and AquaTop Titanium Heaters are more resilient than glass heaters. The ViaAqua Titanium Heater has an easy to read external temperature indicator.

The JBJ True Temp Titanium Heaters are top of the line heaters that are much more expensive than the other heaters at MarineAndReef.com, but they include a controller and remote sensor for highly accurate temperature control.