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I switched from 2 Jäger to the one 200 watt cobalt neotherm couldn't be happier my tank went from inconsistent temperature of +/- 2.5 degrees to stable temperature of 78I've had good experience with cobalt. I'm using the slim design now on all the systems.
Did you contact warranty support? They have a 3 year warranty and will replace. They just replaced mine that was a year old..I personally will not use a ehiem jager again. I bought the 300w. The temp control was a pain to move and it stopped working after 3 months.
I dont understand either, these guys started out well with these neo therms, reviews on the 100-150w are excellent. Good quality, sleek, everything people look for in reef equipment.I have also read reports about the 200w. I have a Cobalt Neo in our 29g, for 1.5 years with no issue. I don't understand why the Neo is so good, but not the larger heaters ?