Aquarium Heating Guide

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Tropical freshwater fish originate from tropical environments so your aquarium water needs to match the temperature where they are from this temperature is around 27 degrees for most fish species and plant species.

There are two types of aquarium heaters available the submersible heater and the inline heater, submersible aquarium heaters will work on any tank setup, inline heaters only work if you have a canister filtration system as the heater is inserted into the return hose back to the tank.

Aquarium heaters are measured in watt output you need around three to five watts of heating power per gallon or four liters of water, very large aquariums will require two heaters to be effective for the amount of water in the tank.

Most modern aquarium heaters will be self contained in other words the heater and thermostat are housed in a glass casing, the temperature adjustment dial is located at the top of the glass tube this dial is a rough indication of the temperature, you need to monitor the aquarium with a digital thermometer and make fine adjustments.

There are aquarium heaters available that have an external controller these are usually digital controllers the submersible heater element is lowered into the aquarium with the power delivery cord returning to the controller which can be located in the aquarium stand or cabinet.

Finnex Digital Heater Controller

The Finnex aquarium heater is an advanced aquarium heating unit available in 300 watt, 500 watt and a massive 800 watt capacity this heating unit is designed for larger aquariums upto 265 gallons.

The unit has a built in memory to restore aquarium temperature should there be a power cut the temperature controller is external and linked to the submersible heating element, automatic shut off and high temperature alert are available on this unit. 

Aqueon Submersible Aquarium Heater

The Aqueon fully submersible heating unit is a self contained aquarium heater the heating element is encased in the glass tube with the thermostat and adjuster located at the top of the heater unit, the unit is equipped with auto shut off and over heat protection. 

The unit is available in 50W, 100W, 150W, 200W and finally 300W allowing a huge range of sizes to suit most aquariums, the unit is constructed from quartz glass that is designed to absorb impacts and the heating unit can be placed vertical or horizontal in the water column. 

Fluval E Electronic Heater

Fluval are a well known brand in aquarium accessories and provide a submersible aquarium heater in three sizes, 100W, 200W and a 300W models, dual temperature sensors provide a very accurate water temperature with a digital temperature display on the unit.

These heating units are suitable for aquariums up to 100 gallons in capacity and are equipped with an advanced safety shut off, very precise water temperatures are easy to obtain with there dual sensor technology. 

Hydor In-Line External Heater

The Hydor aquarium heater is an external design which couples to the return hose on canister equipped aquarium filtration units, available in 200W and 300W capacity this unit is suitable for a freshwater environment or a saltwater environment.

This heating unit features advanced electronic temperature control which allows accurate water temperatures in the aquariums environment, when the water is returned to the aquarium it is filtered and heated to the desired temperature.