eheim new heater

Hey all, I currently use a 75W cheap heater for my biocube 16. I just bought a Eheim Jager 50w not realizing my current is a 75W. My wife is giving me a temp controller for Christmas. I trust Eheim implicitly. But is it big enough?

Hello, many months ago I bought the new version of the Eheim heater, the Thermocontrol E, their previous model is the Jager heater, very well known around the world, I think it's even the most sold heater? Anyways, they improve their model with some feature like the Thermo Safety Control, so...