About the Visi-Stealth Aquarium Heater
This powerful heating unit works quickly and can maintain temperatures with ease. Create a natural and comfortable environment with this heater by placing it where there is good water circulation. This unit is fully submersible and can be installed either vertically or horizontally. An on/off indicator is plainly visible and the insulated heating element is protected by thermal plastic.
How to determine which size heater you need:
Subtract the average temperature of the room the aquarium is located in from the temperature you wish to maintain the aquarium water at. Find the size of your aquarium in the left hand column and move to the column that shows the number of degrees the aquarium needs to be heated. If the heating requirement is between levels, move up to the next larger size.
In larger tanks, or where the room temperature is significantly below the desired water temperature, two heaters may be required. Heaters should be installed at opposite ends of the aquarium to heat it more evenly.
Example:
Average Room Temp = 68 degrees F
Desired Water Temp = 77 degrees F
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Heating required = 9 degrees F
Tank Size = 20 gallon
Heater size needed = 50 watts
| Gallons/Liters | 5ºC/9ºF | 10ºC/18ºF | 15ºC/27ºF |
|---|
| 5 gal/25 L | 25 watt | 50 watt | 75 watt |
| 10 gal/50 L | 50 watt | 75 watt | 75 watt |
| 20 gal/75 L | 50 watt | 75 watt | 150 watt |
| 25 gal/100 L | 75 watt | 100 watt | 200 watt |
| 40 gal/150 L | 100 watt | 150 watt | 300 watt |
| 50 gal/200 L | 150 watt | 200 watt | two 200 watt |
| 65 gal/250 L | 200 watt | 250 watt | two 250 watt |
| 75 gal/300 L | 250 watt | 300 watt | two 300 watt |
Source: Shirlie Sharpe, Ask.com
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