Dennerle Nano Heater Compact

When I got it it seemed fine, but fitting to tank I noticed the mounting is extremely insecure. It flaps about and doesnt sit flush to the glass. If it had 3+ suction cups it would stop that. Design flaw.

Also annoying is that you have to press the button to change temperature, fine for going up, but to lower degrees you have to go up through the whole temperature range to start at lowest. 2 buttons for up or down would have been far far better.

Its not much smaller than other brand. For people thinking this heater is super slim, its not really compared to other brands once its mounted.

Really like this heater, it is not as high as my Eheim heaters of same wattage and the one I got is really good at holding the temperature steady, I have some that are not as good, one of my Eheim for example the temperature really jumps up and down.