Picked up 6 Eheim Jager heaters yesterday, temp testing
As winter hits and my shrimp tanks are staying in the low-mid 60's, I thought I might do something I'd gotten away from years ago -add heaters. I did some research and finally decided on Eheim-Jager Tru-Temp models. I never want the temps in these going past 73 or so, and reviews seems to indicate that these work well in lower ranges and come pretty accurately preset. This was not my experience.
I put 4 of the 75 watt units in empty 20 gallon aquariums overnight set at 69 degrees. Each tank has only an airstone -no lights, pumps or anything to raise temperature. This morning, my readings were 73.6, 74.4, 76.1, and 77.8! Set at 69, all four heaters got warmer than the highest acceptable temperatures for my needs. Very glad I tested them rather than dropping them right in.
I also picked up two of these in 150 watts for my Osaka tanks. Have yet to test these due to not having another empty tank on hand. Once I get the first 4 calibrated, might try them in the 20 gallon tanks understanding that they may heat the water a bit more after shutting off. Anyway, just thought people might find this interesting and thought I should caution that even if all you have on hand is a 5 gallon bucket, it's a good idea to test heaters of any kind before dropping them in your aquarium full of prized livestock. I don't doubt that these will work fine once calibrated, and I get that most people aren't heating tanks to such low temps. So far the only things I would put in the "cons" column for these is that the preset temperatures may not be accurate (at all), the manufacturer states not to use with any thermostat or device that can shut them off, they are supposed to run in the vertical position, and they are really long. The 75 watt units reach both the surface of the water and substrate of a 20 long, and the 150 watt heaters are 13" long. These would suit my needs much better during water changes if I could lay them on their sides towards the bottom. Fortunately I rarely drop the water level more than a couple of inches during shrimp water changes, so this won't be much of an issue for my application. But if these were for fry tanks with frequent large water changes, I'd have to return them. Hope someone finds this helpful.
Nothing good happens fast in an ecosystem.