Mark303 Posted April 4 Share Posted April 4 (edited) I purchased two 150W Eheim Jager heaters for a 75 gallon tank. Before putting in my display tank I thought I would test the calibration in an empty tank to not risk harming my fish. However the only empty spare tank I have is a 10 gallon. Both heaters were wildly inaccurate. Testing individually I set at 75 degrees and tank reached 85degrees, which maxed out the calibration adjustment ring. Since it happened with both heaters I was wondering if this is due to the small size of the tank and overpowering of the heaters for that size. Any suggestion of how to accurately test and calibrate? Edited April 4 by Mark303 typos Link to comment Share on other sites More sharing options...
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