I have the eheim termofilter you mentioned, and it's working fine for almost 2 years now
the only lack i noticed is that the temperature sensor gives ever a temperature wich is 1 degree lower then the real temperature of the tank wich i measure with a traditional indicator.
the only lack i noticed is that the temperature sensor gives ever a temperature wich is 1 degree lower then the real temperature of the tank wich i measure with a traditional indicator.