90 gallon aquarium heater?

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90 gallon aquarium heater?

Postby Rico88 » Sat Aug 21, 2010 8:36 pm

I was wondering how many watts would my heater need to be for a 90 gallon aquarium? Thanks!
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Re: 90 gallon aquarium heater?

Postby Nathan » Sat Aug 21, 2010 9:59 pm

The general rule of thumb for efficiency is at least 5 watts per gallon. A smaller heater will work, but it will take longer to heat the water, and will, therefore, be less efficient, costing you more on your electric bills. If you follow that rule, you're looking at 450 watts (2 heaters) for a 90 gallon tank. However, you may not need that much wattage at all times. I don't use my heaters at all during the summer--we keep the house around 80 degrees in the summer. I plug them in during the winter when we keep the house around 68 degrees.
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Re: 90 gallon aquarium heater?

Postby OinKY » Sat Aug 21, 2010 10:19 pm

Agree with the 5w/1g rule of thumb,so a minimum of two 250w heaters would cover you.
As far as efficiency,remember that they are thermostatic (or should be ;) ) and will only come on when necessary.The way you keep your home heated/cooled will play a big part in how often they are "on".Probably having one at each end,thermostat set 2-4 degrees apart would be most efficient.That would give best distribution,efficiency,and recovery (in case of power loss).
Just think about it.
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Re: 90 gallon aquarium heater?

Postby Antonia » Sat Aug 21, 2010 11:44 pm

We go with two heaters a tank,one placed on each end. :fro:
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Re: 90 gallon aquarium heater?

Postby Rico88 » Sun Aug 22, 2010 7:31 am

okay sounds good. So using 2 heaters would be more cost efficient?
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Re: 90 gallon aquarium heater?

Postby Nathan » Sun Aug 22, 2010 1:18 pm

Two heaters will be more efficient if you have one at each end of the tank, that way each is heating a zone rather than trying to heat the entire tank volume. As far as I know tank heaters top out at 300 watts, so, yes, you would need two heaters. As Oinky said, 2 250 watt heaters would be ideal, and the extra wattage will not be a problem.
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Re: 90 gallon aquarium heater?

Postby OinKY » Sun Aug 22, 2010 5:23 pm

There are higher wattage heaters out there,but you're better off heating by zone with two heaters.
True Temp Titanium makes heaters above 300w...500w,800w,and 1000w.These use a digital controller and remote probe.Conventional-style heaters,Theo and Visi-Therm have 400w models as does the new Fluval E Series.While it might be a bit cheaper overall (but not much) to buy one larger heater,you'll soon make up the difference in savings with efficiency using the two smaller ones.

General recommendation....the Stealth Pro 250w.Not bad price,practcally indestructable,lifetime warranty.
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Re: 90 gallon aquarium heater?

Postby Rico88 » Sun Aug 22, 2010 7:50 pm

okay it makes sense, im gonna go with 2 heaters. im trying to go with the rena smart heaters, since id like to attach it to my xp filters. would two 200 watt heaters be ok? or would two 300 watt be better?
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Re: 90 gallon aquarium heater?

Postby OinKY » Sun Aug 22, 2010 8:29 pm

Noted location as Michigan (sending this to you from lovely Romulus ;D ),so I'd go with the two 300w.Being thermostatic,the extra wattage doesn't mean they'll be on any more (possibly less),but that wattage will help with "recovery" if the power blinks....and remember from past experience....your winters are COLD!
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Re: 90 gallon aquarium heater?

Postby Rico88 » Mon Aug 23, 2010 8:26 pm

ohhh i seee...yes are winters are freeezing!!! alrighty ill go with two 300 watt heaters...thanks!
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Re: 90 gallon aquarium heater?

Postby Tim » Mon Aug 23, 2010 10:05 pm

I have a 300w heater on my 46g so dont be scared of over doing things a little bit. I got it to be able to keep the temp at 84 steadily when treating Ich. It is excellent is keeping the temp stable :fro:
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Re: 90 gallon aquarium heater?

Postby FishDogg » Wed Aug 25, 2010 12:32 am

I have a single 300 watt heater for my 135 gallon. I had two, but noticed my tank stays at a stable 79 -81 degrees. Depending on which thermometer I look at.
135 gallon: 72" x 18" x 22": 2 Oscars: Wrath and Simba, 7 Spotted Pictus Catfish, Stripped Raphael Cat, Texas Cichlid, Jack Dempsey, Rainbow Shark, 5 Clown Loaches. Filtration: Rena XP4, 30ish gallon sump and pump

Other pets:
2 Cats: Jojo and Shadow

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My children: Victorya 12/5/10 McKaiya 06/2/12
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