The functional feature of the aquarium heater is that it is obliged not only to bring the water temperature to indicators favorable for the life of the fauna, but also to constantly maintain this mode. From a constructive point of view, the device is quite simple: it consists of a heating element and a regulating sensor. Additional equipment with useful features allows you to improve the care of heat-loving fish, to avoid their death.

Manufacturers offer waterproof devices that differ in power, type of installation in the aquarium (internal or external). Experts recommend purchasing modern electrical devices at the rate of 1 W per 1 liter of water. When choosing a device, in addition to the volume of the container, one should take into account the thermal conductivity of the material from which it is made, its configuration, the presence of a cover, the temperature in the room, etc. potential and reliability in operation.

TOP 5 best aquarium heaters

5 Tetra HT 150

The fully submersible model is characterized by practicality, versatile design, good thermostat accuracy. The thick-walled flask of the device is made of borosilicate glass, which does not crack under temperature extremes or mechanical stress. When installed on the supplied suction cups, it is placed in the largest hobby aquariums (150-225 liters). The provided power of 150 W is sufficient to maintain the operation of the device.

The heating element is built-in double ceramic, which is environmentally friendly and prolongs the life of the device. The thermostat has a small step of 0.5 degrees, which improves the accuracy of the readings, in the range of 19-31 degrees. The upper limit can be attributed to the disadvantages of the development, since competitors offer analogs with a "ceiling" of 32-34 degrees. Therefore, such a device is not intended for the most thermophilic underwater fauna. Light indication and 2-meter cable are among the positive features of the model.

4 Hydor External Aquarium Heater Eth 200-12

One of the most experienced global brands of aquarium accessories, which has a decent reputation, modern production base and technology, in this flow-through model has implemented the best concept of a heater with an external connection to the filtration system. This design generates a power of 200 W and is attached to containers with a volume of up to 200 liters.

The ergonomic plastic housing has a compact dimensions of 29x8x7 cm and is connected to the filter using mini hoses with a diameter of 12 mm. The thermostat can operate in both manual and automatic modes, providing a constant temperature from 18 to 34 degrees. The use of PTC technology prevents the device from overheating, and the LED indicator indicates the active state of the heating element. Of the usefulness, users also distinguish the optimal length of the cord (1.4 meters). The disadvantage of the model is its high cost in comparison with analogues.

3 Aquael comfort zone gold 100 W

Such a fully submersible model with a thermostat is of interest due to both functionality and technical solution. Here the manufacturer relies on the durability of the device. For this, the contacts are covered with a layer of gold, which does not oxidize in water over time. With the help of a thermostat, they are closed / opened, which affects the operating cycle of the heating coil.

Importantly, an electronic relay is built into the design, which automatically maintains the temperature regime in the range from 18 to 32 degrees.The flask of the device, despite its apparent fragility, is quite impact-resistant, since it is made of an alloy of special plastic and glass. The model is designed for an aquarium with a capacity of 60-100 liters. The owners of its advantages include uniformity of heat distribution thanks to a ceramic radiator, build quality (each device undergoes mandatory computer testing at the factory), a warranty period of 2 years.

2 Xilong XL-999 500 W

This device for maintaining an optimal temperature balance is ideal for large aquariums. It is capable of supporting 500 watts of power, which is very comfortable for tropical fish and other wildlife. The body of the device, made of stainless steel, is as tight as possible, in addition, it additionally has a special protective shell.

Among one of the main positive aspects of the device, consumers note the good sensitivity of the thermostat and the convenience, smooth stroke of the handle. The readings are accurate to 1 degree. Working in the range from 16 to 32 degrees, the immersion-type heating element provides the best temperature balance of the water environment. The provided system of double control allows you to monitor the heat loss with high quality. Among the advantages also stands out the presence of an operating status indicator and a shutdown sensor. When dehumidifying, it de-energizes the device after 40 seconds!

1 Barbus Heater 009 50 W

A rapidly gaining popularity young Russian brand has created a whole line of efficient aquarium heaters in a wide power range of 25-300 watts. One of the best-selling was the 50-watt design, which belongs to the development of a new generation. It can be used for installation in both fresh water and sea water.

The main distinguishing advantage of the device is the double insulation of electrical elements. Thanks to this, you can be sure that neither you nor the underwater fauna will be harmed while maintaining the aquarium and during the operation of the device. The product has a durable metal case made using innovative technology, and is additionally equipped with a high-precision thermostat with a dial. The model belongs to the fully submersible type and is mounted near the water flow without contact with the ground. As advantages, the owners call the possibility of installing the device in containers of the most popular volume of 40-80 liters, adjusting the temperature regime in the range of 20-32 degrees, the presence of light indication, a cord 145 cm long.