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Old 10-12-2004, 01:34 AM   #11
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Quote:
Originally Posted by rubysoho
I'm also looking at heaters for a 55 gal freshwater and I see all these names and numbers, but in the descriptions it never says how big of a tank it will heat. Can someone clearify this?
The general recommendation for a heater is 5 watts per gallon, but it also depends on how much you need to raise the water temperature above room temp. Each manufacturer also has a table to give you a guideline for watts/gallon. Here are some links:

http://www.drsfostersmith.com/Produc...565&in_merch=1

http://www.drsfostersmith.com/Produc...565&in_merch=1

It seems like the suggested wattage for a 55 gallon tank is 200-300 watts, depending on the manufacturer. I would use 2 heaters, as others have suggested also -- two 150 watt heaters should be fine. You could add the water and test the heaters for a few days before the fish are added, to make sure the heaters are going to keep the water at the right temperature.
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Old 10-12-2004, 02:36 AM   #12
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Old 10-12-2004, 07:30 AM   #13
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I copied this chart on heater sizes from Live Aquaria this should help Rubysoho,

Watts Tank Size Heater
50 10 -15 Gallons 9"
75 15 - 20 Gallons 10"
100 20 - 30 Gallons 12"
125 30 - 45 Gallons 12"
150 40 - 60 Gallons 13"
200 60 - 90 Gallons 15"
250 90+ Gallons 17"
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Old 10-12-2004, 11:40 AM   #14
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With bigger tanks, 5 wpg is too much. The heaters would constantly be turning on and then turning off. Plus, with a larger tank, there is not as much surface area (per gallon of water) contact with the room air; therefore, loosing less heat when compared to a smaller tank.

Ebo Jaggers are my favorite heater for ease of use.
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Old 10-12-2004, 12:28 PM   #15
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Ebojagger are great
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Old 10-13-2004, 12:58 AM   #16
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Quote:
Originally Posted by Menagerie
With bigger tanks, 5 wpg is too much. The heaters would constantly be turning on and then turning off. Plus, with a larger tank, there is not as much surface area (per gallon of water) contact with the room air; therefore, loosing less heat when compared to a smaller tank.
I also thought of that; the 5 wpg rule holds up at smaller tank sizes but not at larger sizes, because larger bodies of water (larger tanks) hold heat better than smaller tanks. This link shows that larger tanks don't need 5 watts per gallon.
http://www.thatpetplace.com/Products.../Itemdy00.aspx
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Old 10-13-2004, 01:36 AM   #17
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Thanks for all the feedback everyone! So is a 55 gal considered a large tank and wouldn't need the 5wpg? And according to An T-iasg's link, I think it came out to be approx. 2.7 wpg (150 total). Does that sound right? I am a little hesitant in believing websites just because I don't hear "real experience" or not enough viewpoints.
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Old 10-13-2004, 04:07 AM   #18
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That website does seem a bit off. I have a 20 gal and my 100W was pushing it's limit and the website recommends only a 50W. If I were you I would get 2 100W or 150W heaters. One for each side of the tank.
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Old 10-13-2004, 01:53 PM   #19
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150 total
Sounds good to me! Get a quality heater and you should be fine.

I have also read in the past that a larger heater (5+ wpg) will turn on and off more, and wear out the mechanism. It made sense to me.
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Old 10-13-2004, 01:55 PM   #20
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BTW~ it also depends on how much cooler the room temp is from the desired tank temp. If you keep your place chilly (one of those wear 3 sweaters-type person), then you will need more wpg to keep the tank warm.
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