Temperature fluctuations with new heater
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Temperature fluctuations with new heater

This is a discussion on Temperature fluctuations with new heater within the Equipment Talk Section forums, part of the Aquarium Related Chat category; I have a Eheim Jaeger Trutemp heater for my small tank. I noticed that there are temperature fluctuations. The temperature ...

  1. #1
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    DefaultTemperature fluctuations with new heater

    I have a Eheim Jaeger Trutemp heater for my small tank. I noticed that there are temperature fluctuations. The temperature goes between 25.4 to 26.3. I don't think I've ever encountered this before. Is it possible that I set it too low? Meaning it doesn't kick in until the temperatures reaches 25.4? If I were to raise it, would that not mean that it would get warmer than 26.3? I'm really confused.
    29 Gallon planted, low-tech:
    Male Betta
    Neon Tetras
    Glowlight Tetras
    Hengeli Rasbora
    Harlequin Rasboras
    Otocinclus
    Trumpet and Assassin Snails

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  3. #2
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    When does it hit the higher temperature? Could the temperature be set at 25.4, but the light or something be raising it above that during the day?
    The Guy and dino like this.

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    Super Moderator The Guy's Avatar
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    Try to recalibrate it if it's an older heater, google or u-tube it for how to do it.
    Back in the hobby, 1- 20 gallon shrimp tank and a 42 gallon community corner tank

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    Quote Originally Posted by TomC View Post
    When does it hit the higher temperature? Could the temperature be set at 25.4, but the light or something be raising it above that during the day?
    It changes throughout the day. When I turn on the light in the evening, I usually open the lid a tad.
    29 Gallon planted, low-tech:
    Male Betta
    Neon Tetras
    Glowlight Tetras
    Hengeli Rasbora
    Harlequin Rasboras
    Otocinclus
    Trumpet and Assassin Snails

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    Quote Originally Posted by The Guy View Post
    Try to recalibrate it if it's an older heater, google or u-tube it for how to do it.
    I bought it a couple of months ago. But I will try to re-calibrate it this weekend.
    29 Gallon planted, low-tech:
    Male Betta
    Neon Tetras
    Glowlight Tetras
    Hengeli Rasbora
    Harlequin Rasboras
    Otocinclus
    Trumpet and Assassin Snails

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    Is your issue with the temperature variation? That's the inherent hysteresis in the internal temperature switch. This is a characteristic of controlling an on-off device to a set-point.
    There needs to be band - a "turn on" temp and a "turn off" temp. It likely won't get too much better unless if you go with an external controller, but then you will be cycling your heater on and off a lot to try and hit a narrow temperature band. I would say unless if you have some super sensitive fish, a 1 deg C variation is nothing to worry about.

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    Quote Originally Posted by kivyee View Post
    Is your issue with the temperature variation? That's the inherent hysteresis in the internal temperature switch. This is a characteristic of controlling an on-off device to a set-point.
    There needs to be band - a "turn on" temp and a "turn off" temp. It likely won't get too much better unless if you go with an external controller, but then you will be cycling your heater on and off a lot to try and hit a narrow temperature band. I would say unless if you have some super sensitive fish, a 1 deg C variation is nothing to worry about.
    I was paying a bit more attention yesterday evening. The temp goes down to 25.4, the heater kicks in until it the temp is at 26.2. So a variation of almost 1 degree numerous times a day is nothing to be worried about? I just don't understand why my simple Aqueon heater kept the temp in the 5 gallon at a steady 25.8. I'll try to re-calibrate it this weekend and see if it changes anything. I might just change heaters...
    29 Gallon planted, low-tech:
    Male Betta
    Neon Tetras
    Glowlight Tetras
    Hengeli Rasbora
    Harlequin Rasboras
    Otocinclus
    Trumpet and Assassin Snails

  10. #8
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    Personally, I wouldn't worry about 1 degree.

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    If you are anal about temp swings I’d recommend what I always do and that’s a temperature controller with a titanium heater. I normally spend 100.00 for the unit and heater and it lasts years without issue. Also the temp will swing .02 of a degree between off and on.
    500 gallon plywood tank
    230 motor stingray breeding tank. led lighting, dual sump sump,and drip system
    150 gallon saltwater mixed reef.
    150 gallon African cichlid
    90 gallon fahaka puffer tank
    75 gallon flowerhorn tank
    55 gallon axolotle tank
    loads of guppies and shrimp tanks

 

 


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