At first I thought this heater was inaccurate so I arranged for a return. It turned out that my thermometer was defective. This heater heats water well and the digital display is nice. I like the cage around the heater so no fish or plants get burned. Due to my mistake I returned this for two 150w Eheim heaters. I learned on YouTube that it's better to use multiple heaters in case of failure and because it has more surface area to heat up. This is a good heater but I prefer the German Eheim Jรคger TruTemp because they are from a company that has been around for a long time and they have a 3 year guarantee. They are also longer so more surface area is heated. This heater has a fairly compact 11-1/2" profile where the Eheim models are 13-5/8". So it might be better if you have an aquarium that is not very high. The price of this heater is also acceptable. I took off a star because this company has no experience and I haven't seen any guarantees.
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