The aquarium size matters for more than just the heater wattage that you need. That way you are ensuring that heat is being distributed throughout your aquarium as evenly as you can manage. If you have a vertical model then you should consider placing the aquarium heater near the main water flow of the tank or near a powerhead. Now, the best place to put your aquarium heater will depend on its distribution method. The moment a heater becomes exposed to the air it risks cracking as the heat is not being absorbed by the water. You must remember to switch this heater off when you perform water changes as you risk damaging the heater if it becomes exposed to the air. The other type of heater is the older design where a vertical glass tube is set in the aquarium water but rises slightly out of the water so the hobbyist can access the controls. Essentially, it is a great way to evenly distribute the heat throughout the tank and not a single side or point. These heaters lay along the bottom of the fish tank and allow heat to rise through the aquarium water supply. ![]() The first type of heater you can consider is a submersible aquarium heater. The 10-gallon tank might only require a 30-watt heater while the 75-gallon tank might require a 225-watt heater.īefore I can answer where the best place to put an aquarium heater, we need to talk about the different types of heaters as they will dictate where you can place them. If you are trying to heat a 10-gallon aquarium that is going to be completely different compared to if you are trying to heat a 75-gallon tank. ![]() That is why the specific heater wattage is so important when considering the fish tank volume. The more water there is the harder it will be to heat. Water is an excellent conductor of heat which means that it will absorb heat well but slowly. The aquarium volume will be the largest factor in changing the temperature within your tank. Multiple heaters might be better than one big heater for the winter because if one fails there is another that will give you some time to notice the equipment failure. You should always do your best to get the correct size heater for your needs as even a heater that is too large can lead to problems in your fish tank. For example, if you live in a colder climate with drafty windows, then you might need to either consider relocating the fish tank or springing for a high-quality heater to keep up with the demand to retain the water’s heat.Ī word of warning, however, there is the potential for failure with heaters. You also need to consider the temperature of the room that your fish tank is located. The aquarium volume will require higher heater wattages. The volume of the tank makes a big difference as more water means there is more area for the heat to stabilize. The correct size is largely determined by the volume of the tank and the temperature you are trying to stabilize your water at. Getting the correct heater size for your fish is incredibly important as it is the only thing standing between your fish and freezing in their home. You want to stick to the results as a minimum in determining the heater wattage for your aquarium as it will keep you in the general vicinity of your aquarium heat needs. Look at the aquarium heater size calculator below to help make your final purchasing decision. With it, you can measure your tank and get the precise amount of gallons it will hold. ![]() If you’re not sure how many gallons your fish tank can hold you should check out our aquarium volume calculator. Be sure to account for extra water volume in your sump, if you have one. To get a more accurate estimate for your aquarium heater need you can subtract your room temperature from your target aquarium temperature, multiply by the number of gallons, and divide the total by 2.Īs with most things, your situation may be different so please adjust as you see fit. It takes approximately 1/2 watt to increase the temperature of 1 gallon of water by 1 degree. The watts per gallon is just a general guideline as it can tend to be on the conservative side so you might need more wattage depending on the needs of your fish tank volume and environment. The general rule that aquarists follow is that you want to have a wattage range between 2.5 and 5 watts per gallon.
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