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Post by scoobnoob on May 19, 2014 11:20:50 GMT -5
Why is a 300 watt jager heater rated for 150 gallons but a 300 watt cobalt is only about 1/2 that?
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Post by ryansweatt2004 on May 19, 2014 11:28:28 GMT -5
That's a good question! I know I've never used anything other than a single 300w heater even on my old 150 gallon tank. Water has always stayed 78-80.
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Post by gotareef on May 19, 2014 11:42:34 GMT -5
I am guessing because one is "under rated" and one is "over rated"
jager heaters are probably the best heater made
but I think a 300w heater on a 150g tank would run 3x as long as a 500w to warm the same amount of water.
maybe cobalt company dosnt want you to run the heater full blast all the time so they rate it for less water
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Post by doverdoug on May 19, 2014 12:15:21 GMT -5
I am guessing because one is "under rated" and one is "over rated" jager heaters are probably the best heater made but I think a 300w heater on a 150g tank would run 3x as long as a 500w to warm the same amount of water. maybe cobalt company dosnt want you to run the heater full blast all the time so they rate it for less water ^this I run a eheim jager 100w on my 37g w/10 sump and the temp doesnt move from 79° I set it over a year ago and havent messed with it since. |
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Post by BriMc on May 19, 2014 12:26:02 GMT -5
I may have found the answer to your question. I went on the Eheim website and did the math and came out with the same numbers. According to the Eheim website the 300w heater is rated for roughly 159-264 gallons doing the conversion from Liters to gallons but at an inbound voltage of 230v. With 230 V you only need half the current to get the same power as with 110 V. If you took the 300w heater fed it 230 it would do the 159-265 gallons, cut the 230v to 120v the heater would produce half the heat meaning half the water volume.
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Post by maineultraclassic on May 25, 2014 8:10:06 GMT -5
It's impossible to say that a certain wattage heater is for a certain gallon tank without knowing how much above the room temperature you need to have the water temperature at.
My complete system is only about 70 gallons of water, so I "should" need about 200-300 watts of heaters...........but in reality I have 500 watts of heaters to keep up. With my sump in the cool basement, it takes more power to keep the water up to temp.
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Post by moulton712 on May 25, 2014 22:01:03 GMT -5
To add, most of them suggest for x amount heat for x amount of water. Like heating 5 degrees for a 55 gal needs a 200w. But then if your house is cold in the winter you want a bigger heater.
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