Choosing an aquarium heater can be difficult because there are so many options. Over the years I have tried many brands but I had always been a fan of Ebo-Jager heaters. Recently I finally bought new ones as my existing Ebo-Jager aquarium heaters that are 10 plus years old have started to have issues. First off Ebo-Jager aquarium heaters are now Eheim Jager heaters. I believe Eheim ended up buying the Ebo-Jager brand. I had purchased a 50 and 250 watt versions. They also make a 25, 75,100,125,150,200, and 300 watt versions. On to the review.