This page explains:
- How to determine which aquarium heater size you need.
- 3 things you should know about aquarium heaters.
Step 3) Use this table to determine how much wattage the aquarium heater needs to have:
|Aquarium size (Not sure?)||To raise the water temperature 0.1-5ºF above the room temperature, you need a heater with...||To raise the water temperature 5.1-10ºF above the room temperature, you need a heater with...||To raise the water temperature 10.1-15ºF above the room temperature, you need a heater with...|
|5 gallons||25 watts||50 watts||75 watts|
|10 gallons||50 watts||75 watts||75 watts|
|20 gallons||50 watts||75 watts||150 watts|
|25 gallons||75 watts||100 watts||200 watts|
|40 gallons||100 watts||150 watts||300 watts|
|50 gallons||150 watts||200 watts||2 x 200 watts|
|65 gallons||200 watts||250 watts||2 x 250 watts|
|75 gallons||250 watts||300 watts||2 x 300 watts|
After a heater has been added to an aquarium, it’s best to check on it to see if it’s working. It will usually take about a day or two for the aquarium heater to warm up the water of the aquarium, so you should check it after that point.
If the aquarium heater hasn’t warmed up the water of the aquarium after 2 days, you may need to replace it.
As seasons change, the temperature of the room your aquarium is in may change. If it decreases too much, the wattage of which your heater needs may need to increase. To avoid any issues:
- Keep the temperature of the room constant throughout the entire year.
- Progress through Steps 1–3 as each season changes to ensure the aquarium heater has enough wattage.
It’s not a bad idea to have two aquarium heaters with the proper amount of wattage in an aquarium. Yes, this does double the amount of wattage the aquarium needs, but both of the aquarium heaters will turn off when the water of the aquarium has reached it’s desired temperature anyway. The benefit of having two aquarium heaters instead of just one is that if one fails, the other can continue maintaining the proper water temperature until you eventually realize that one of your heaters have failed and replace it.
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