It can maintain water temperature OR it can heat the water. The vibration and the water jets are both strong enough to make me feel like it's actually DOING something. This is the third foot spa I've tried in the last two months (I've taken the others back) and it's the ONLY one that lived up to expectations. I like the pedicure attachment though I can see how it might be awkward for some. The only cons I can think of is it's heavier and louder than most. I'm guessing it has to be in order to do the job right. This is THE foot spa.