Can I use two 100 watt heaters for a 75 gallon tank?

Megal0don

Would two 100 watt heaters be enough to keep a 75 gallon tank at 76 degrees? My house stays at 72 degrees or warmer year round and I didn’t want to buy another heater if I don’t need to since I already have the two 100s
 

YellowGuppy

I'd say give it a shot and see what happens! I can't imagine them not being up to the task, but I'd you're having a hard time getting it where you want it, upgrade once you've had a chance to see if it works.
 
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juniperlea

I have (had) a 300 in my 75g. It died about a week ago. The only spare heater was a 100, so I put that in and the temp is now at 78F. But, my indoor temp is around 77 to 78F. Heaters drive me nuts. I'm convinced that indoor temp makes a big difference. In the winter, my 300 struggled to keep at 78, but my winter indoor temp is usually about 64F. (am poor!!) If you're at 72 all the time, I'd go with two 100s (IMO!)
 
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Mongo75

It's already been said, but I'll add to that. It depends on what your ambient room temp is. If it's close to your desired water temp, it should be no problem, but as the ambient temp drops there will come a time when the two 100W heaters won't be able to maintain the water temp, and they may end up being on all the time it it gets cold enough.

According to the table about halfway down in this article, in a 75 gallon tank, a 250 watt heater would only be able to raise the temp 9 degrees F. Like YellowGuppy said, I would try it, but be prepared to upgrade if necessary.
 
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Megal0don

YellowGuppy juniperlea Mongo75 thank you all for your input! I’ll see what happens and hopefully it works out
 
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juniperlea

YellowGuppy juniperlea Mongo75 thank you all for your input! I’ll see what happens and hopefully it works out
oops... sorry, I accidentally hit the quote button and something came that said something about multi something..... Apologies everyone !! What a fool I am!
 
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FuryX

It's already been said, but I'll add to that. It depends on what your ambient room temp is. If it's close to your desired water temp, it should be no problem, but as the ambient temp drops there will come a time when the two 100W heaters won't be able to maintain the water temp, and they may end up being on all the time it it gets cold enough.

According to the table about halfway down in this article, in a 75 gallon tank, a 250 watt heater would only be able to raise the temp 9 degrees F. Like YellowGuppy said, I would try it, but be prepared to upgrade if necessary.
Late to the thread but can an aqueon pro 300 watt be able to keep a 75 gallon at 75 degrees. My house stayd at 79+ most of the time. barely ever drops below 75.
 
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Mongo75

If your ambient temp is 79°, then your heater should almost never come on if you have it set to 75°, and a 300W heater would be more than enough to compensate for minor temperature fluctuations. I like using this website for a general guide to heaters, How to Size a Heater for Your Aquarium. According to the table about half way down, a 300W heater should be able to heat the water 18°.
 
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mattgirl

I run 1 200 watt heater in my 55 gallon tank. It isn't unheard of for my house to get down in the mid to low sixties at night during the winter months. It keeps my tank at a constant 76 degrees.
 
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FuryX

I run 1 200 watt heater in my 55 gallon tank. It isn't unheard of for my house to get down in the mid to low sixties at night during the winter months. It keeps my tank at a constant 76 degrees.
Thanks. How do you put a quote in the bottom of your comment?
 
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mattgirl

Thanks. How do you put a quote in the bottom of your comment?
Click on your name up at the top right of the screen. A drop down box will come down. Click in signature and follow the prompts or go into your account and find "signature"
 
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