Eheim Jager Aquarium Thermostat Heater 300W

Works great. I read some reviews on this item sometimes being finicky getting the temp dialed in properly, but this wasn't the case for me. It went to exactly the temp I set it for on the first try. It's been in use for at least a few weeks now. So far so good. Great price too compared with similar heaters in pet stores.

Buen funcionamiento, calienta muy bien y de forma segura mi acuario, sistema de seguridad indispensable, materiales de calidad, solo una cuestión. he tenido que calibrar varias veces la temperatura. pero sin duda recomendable por precio y calidad.

I ordered this heater to replace a Elite Submersible Preset Heater, 300-Watt that my catfish had broken in a fish free for all freak-out. I have used EHEIM in the past and they have never disappointed me (though I have been confused by them) so I decided to try something new. I was surprised when the specifications said a single EHEIM 300W heater could heat tanks over 100 gallons, but I like the concept of running only one unit.When I received a shipping box that was about 4 feet long, the potential abilities of the heater started to make sense.I was expecting a heater of similar dimensions to almost every 300W heater I have ever owned. EHEIM was not even in the same park. The EHEIM 300W heater is 22" in overall length, with very sturdy, heavy glass and has a thick industrial feel to the power cord. I have found the temperature setting to be the most reliable and accurate I have ever used, and I have used a lot of heaters. The added length has increased the surface area of the heating element and I have found that, so far, one EHEIM 300W unit is efficient enough to heat my 150 gallon tank on its own without it running constantly. I also appreciate that there is no noise associated with the unit switching on or off. My tank temp is very stable and I have noticed zero fluctuation of internal temperature regardless of surrounding room temperature. Let me remind you again, this heater is long. I own a a tank that is 30" tall so placement of the unit is not a problem, but I can see how placement could be difficult for anyone who has a 24" or shorter tank height. Though you could solve this issue by just tilting the heater or placing it horizontally, but in some situations I could see how the heaters size might be a problem. I was pleasantly surprised by the overall performance of the EHEIM 300W heater. It isn't the perfect heater, but I have been very pleased with it and unless something unusual happens, I will continue to rely on it for my heating needs. Pros: Price, sturdy build, greater surface area, almost perfect temp setting, stable heating, quiet Cons: Much longer length than other heaters

Very good product. I really appreciate it heats my 120 gallon tank properly.

I've only used these heaters for over 20 years now. They are built solid and fully submersible. I have one in a turtle tank with a river rock bottom and he bashes it around constantly and not so much as a scratch on the glass. Highly recommend.