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Best adjustable aquarium heater
The temperature of the fish tank is an important factor affecting the comfort and health of your aquarium fish. One thing you should know is that fish do not produce their own body temperature like humans and other mammals do. They must rely on the temperature of the water in the fish tank to maintain their own body temperature. This makes keeping the temperature of the fish tank very critical for your aquarium pets. This fish tank heater guide covers everything you need to know about heaters.
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A heater is necessary for most aquariums, and its role is to replicate the natural environment and water conditions to allow certain species to get used to the water tank life. Normally, a heater raises the water in the tank between 76 and 80°F, sometimes slightly colder and sometimes slightly warmer; it still depends on the species you raise. The heater also maintains a consistent temperature using a thermostat which is usually inbuilt. Changes in water conditions can lead to stress in fish which can be fatal if they are exposed to prolonged episodes of stress. Keeping the water temperature consistent mimics their natural environment as large bodies of water (such as the sea) do not drastically and quickly change in temperature.

It is also worth noting that in some countries, fish keepers are facing the opposite problem. The weather is too hot, and their fish tanks are heated too much, causing the water temperature to overheat. In cases like this, you can use aquarium coolers instead of heaters. Some people choose to keep more than one heater in their aquarium, especially if the aquarium is large and is being kept in a cold room. This is ideal because if the first heater stops working, the second one will keep the water temperature at the temperature conditions required by the aquarium creature. If you do choose to keep two heaters, place them at opposite ends of the tank.
Types of Aquarium Heaters
There are many different types of heaters on the market to choose from. Which type of heater you should choose will depend on the size of your tank, the type of fish you raise and your personal preferences.
We will look at the different types and then how you decide which type of water heater is best for your fish tank.
The five main types of heaters are immersible, submersible, substrate, in-line and filter.
Hanging/Immersible Heater
Immersion heaters are also called hanging heaters. It hangs on top of your tank, and the heating element (usually contained in a glass tube) is placed in the water to heat the tank. This is probably the most common heater for freshwater tanks for beginners and is often included as part of the starter pack. You need to make a hole in the hood of your water tank so that this heater can fit on it.
This type of heater is usually less efficient but provides basic heating. Immersion heaters are not recommended for saltwater or saltwater environments.
Submersible Heater
Submersible heaters are installed underwater. This heater should be placed next to the inlet of the filter so that it will heat up the water when it returns to the tank. This heater has a spiral element enclosed in a glass tube or a toughened plastic tube. Glass may crack easily, and if the unit is overheated, tough plastic is less likely to crack. These heaters usually have an LED light on top that will tell you when the heater is on.
This heater will help keep your tank at a more consistent and stable temperature than an immersion heater.
Substrate Heater
These heaters usually complement other heaters and come in the form of electrical wires fixed to the bottom of the fish tank. This type of heater reached its peak in the 1990s, especially in planting tanks, because heating promotes gentle water movement and can stimulate root growth.
These heaters are now less common and quite expensive.
In-line Heater
This heater can be installed between a sump or a filter so that it can heat the water as it returns to the tank.
It is usually made of heat-resistant plastic, so it does not cause a fire. This type of heater is ideal for those that keep larger aggressive fish who fight with equipment, like some cichlids. They are much more expensive than other heaters we are working on. Another disadvantage is that the more components you have outside your tank, the more chances there are for leaks.
Filter Heater
Some filters incorporate a heating element so that when water passes through the filter, it is also heated.
The most common filters with built-in heaters are canister and sometimes power filters.
As long as you know the difference between different types of heaters, it is not difficult to choose the right type of heater for your fish tank. There are five basic types of aquarium heaters: immersible heaters, submersible heaters, substrate heaters, in-line heaters and filter heaters. If you are interested, please go to our aquarium product category pages now!