I have an Eheim heater that has always kept the temperature fairly stable until now. I only notice that due to the warmer weather, there are more differences in the water temperature. now I have a beginner's question: which devices do I need to ensure that my temperature remains stable? I notice in warm weather that the temperature can rise quickly. I would like this to be automatically controlled and to be able to see the temperature on my phone. I just have no idea how you guys do this and what equipment exactly goes with it. (I don't have a sump)




