I've got a 150W Eheim Jager which I've never been entirely happy with... I bought it over the cheaper models because it could heat as low as 18C, but even after being calibrated, mine won't go below 21C (in a room temp consistently around 11-15C). NOW, it's getting major condensation inside, not happy! I've done a quick search around on condensation in heaters and the general consensus seems to be to replace the unit ASAP. The earliest I can get to the store I bought it from (it's still under warranty) would be Friday afternoon... What're the chances it'll be fine until then? Or, should I run out and get a replacement from the LFS tomorrow (albeit at three times the price that this other shop has them for!). Would love to hear from others just how long they take to completely fail, and, also, just what happens when they DO fail? Never had these issues with the cheapo heaters I've had in the past!