hi i,m setting up a new tank, going large. have a 116 gallon tank, what size of heater do i need ,and is ther a submergable one i could use .
Typical wisdom is between 3 and 5 watts of heating per gallon dependant on the temperature swings in the room where the tank is. You're looking at between 350 and 600 watts of heating. Your best bet will probably be two or more heaters, like a pair of 200 or 300 watt heaters.
There are a lot of options available and plenty of submersibles. My personal favorites are the Visi-Therm Stealth because they blend into dark backgrounds and there is no exposed glass, just black plastic making it a far tougher device.
Aquarium Heaters: Submersible Heaters by Hydor, Tetra, Fluval, Rena, Visi-Therm, ViaAqua and More
I like the Stealths as well, but I also have a few Hydor heaters that are great. Two 250 or 300 watt heaters would be perfect, situated at opposite ends of the tank and close to areas of high water flow.
I am using one of these in my 46 gallon, a 200 watt. So far it has been a darn good heater.
Aquarium Heaters & Temperature Control: SmartHeaters Aquarium Heaters by Rena
I am using two 250W stealth heaters in my 120. It is just about right for a tank that size.
Two 300W will do the trick, running along the back wall of your tank on the bottom crevice...
One of my tanks has a Rena Smart Heater, I really like it. It fits over my filter intake tube, so it eliminates the apperence of another thing in the tank. I have a Hydor in my other tank. I like that one as well. I recommend doing 2 heaters, one near each filter.
One thing about heaters, for the most part there's little price difference between the sizes. In the case of the stealths it's maybe a buck per 50W increase, maybe. So when you buy one just go ahead and take one size larger just to be on the safe side. Take it from some one who tried to save a buck or two by getting a small heater... just fork out the extra buck or two and do it right.
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