Its Hutch Posted November 20, 2020 Share Posted November 20, 2020 Bought a brand new Eheim heater for my 75g. Set it to 78 degrees and put it in my tank. Checked the temp 24 hours later and noticed the thermometer said 82. Went ahead and picked up a digital thermometer to confirm and sure enough it showed 82.3 degrees. Anyone else had a heater be off by 4 degrees out of the box? Is this normal? I set it to74 and am curious to see what the temp is when I get home. Link to comment Share on other sites More sharing options...
MickS77 Posted November 20, 2020 Share Posted November 20, 2020 The Jagers have like two dials, the blue one and the red one. If you have the instructions it explains how to set it. Link to comment Share on other sites More sharing options...
tolstoy21 Posted November 21, 2020 Share Posted November 21, 2020 (edited) As @MickS77said, you sometimes need to calibrate them. They’re not always calibrated 100% out of the box. Those steps are in the instructions. However, I have a few that just won’t calibrate accurately not matter how hard I play with the red dial. For those I just adjust them according to the tank temp reading and tweaking a bit and don’t pay attention to what the dial says. Edited November 21, 2020 by tolstoy21 2 Link to comment Share on other sites More sharing options...
Andy's Fish Den Posted November 21, 2020 Share Posted November 21, 2020 I had the same problem when I got one, then for some reason I actually read the instructions, I know weird! And found out about the dial that moves to calibrate. 1 Link to comment Share on other sites More sharing options...
StaceyTNBCkicker Posted November 21, 2020 Share Posted November 21, 2020 I'm glad I seen this. I just bought one as well and would have not read the instructions 🙃. Now I most definitely will! Link to comment Share on other sites More sharing options...
Daniel Posted November 21, 2020 Share Posted November 21, 2020 In my experience almost all heaters and thermometers are off a few degrees in either direction. The whole concept of temperature has always been a tricky thing for me to get my mind around. I know temperature is what a thermometer measures.... But for those times I felt like I needed a reliable baseline to calibrate from I use a NIST traceable thermometer like this one made by Traceable (clever name): Also your own hands are awfully good thermometers. The differences between 75°F and 80°F and 85°F are as clear as night and day. Link to comment Share on other sites More sharing options...
Its Hutch Posted November 21, 2020 Author Share Posted November 21, 2020 Got home last night and the temp was at 78.2 so adjusting 4 degrees did the trick. Reading instructions? Who does that? lol 1 Link to comment Share on other sites More sharing options...
tolstoy21 Posted November 21, 2020 Share Posted November 21, 2020 8 hours ago, Its Hutch said: Got home last night and the temp was at 78.2 so adjusting 4 degrees did the trick. Reading instructions? Who does that? lol So to ‘calibrate’ it’ just turn the red dial to point to 78 so it matches the actual water temp. 1 Link to comment Share on other sites More sharing options...
tolstoy21 Posted November 21, 2020 Share Posted November 21, 2020 (edited) 8 hours ago, Daniel said: But for those times I felt like I needed a reliable baseline to calibrate from I use a NIST traceable thermometer like this one made by Traceable (clever name) I use a Thermapen. Super accurate and fast. Sometimes I even clean it afterwards before using it on a steak or chicken! 🙂 Edited November 21, 2020 by tolstoy21 1 Link to comment Share on other sites More sharing options...
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