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  1. #1
    Senior Member Fisherman's Avatar
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    New to sumps.. Question..

    DO i have to set the heater up to a higher degree to get proper heat in tank?

    i've had this same tank planted not drilled and with 1x 250w ebo.. and it sat at 78 degrees..

    now i have the sump and all the running and i have 2 x 250w EBO's running.. for last 8 hours and the tank is at 68 degrees. lol..

    is it just taking longer due to amount of water be rotated?

    just wondering.. also trying to learn as i go..

  2. #2
    Senior Member pwall's Avatar
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    Perhaps one of the heaters isn't working?
    Regards,
    Patrick.
    Ottawa (Orleans), Ontario
    Yahoo IM: pwallnfld

  3. #3
    Senior Member Fisherman's Avatar
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    the light is on.. On both heaters.. and if i grab them there both warm..

    could it be the movement in the sump is just to fast for the heater to keep up?

  4. #4
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    man have some patience: you put in winter cold water its gonna take at least a day.

  5. #5
    Senior Member Fisherman's Avatar
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    lol.. probably right plus i have no lights on to help heat the tank lol..

    today i have my lights on timer to help heat tank..

    will see over next few days!!

  6. #6
    Senior Member Deafboy's Avatar
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    Let's do a calculation using the specific heat equation:

    Q = DeltaT.c. m

    This equation tells us the amount of heat (Q) needed to change the temperature (DeltaT) in degrees C of a material of a substance with specific heat (c) and of mass (m).

    In your case,

    c = 4,186 kW.s/kg (this is the specific heat of water)

    m = 429 kg (mass of water based on 113 gallons of water)

    Q = 500 W.s (heat produced by two 250 W heaters)

    It turns out it takes about 1 hour to increase the temperature by 1 degree Centigrade. If you want to increase by 10 degrees then it would take 10 hours.
    20 g reef, 72 g reef

  7. #7
    Senior Member mickyfin's Avatar
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    ^^^^^

    That's hot.
    Don't Panic Feel free to visit my blog -> Internet Tough Guy.

  8. #8
    Senior Member Fisherman's Avatar
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    Thanks and great calculation!!!

  9. #9
    Moderator cres's Avatar
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    Unfortunately, you also have to account for heat dissipation from your tank system.

    The warmer the water, the colder the surroundings, the faster you will lose heat.

    And add in heat from pumps, lights, etc.

    Oh, what the heck, I think we'll need a differential equations to sort this whole thing out.
    Sarchasm: The gulf between the author of sarcastic wit and the person who doesn't get it.

  10. #10
    Senior Member Deafboy's Avatar
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    Originally posted by cres
    Unfortunately, you also have to account for heat dissipation from your tank system.

    The warmer the water, the colder the surroundings, the faster you will lose heat.

    And add in heat from pumps, lights, etc.

    Oh, what the heck, I think we'll need a differential equations to sort this whole thing out.
    Of course, I meant it as an estimate...:drool:

    Quel avocat du diable...
    20 g reef, 72 g reef

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