They're both similar and essential for your tank. While a powerhead flows in one direction, a wavemaker generates a forward motion, then reverses the water. They both have different functions, though, and serve different purposes. If the powerhead moves parts of water around and assists the filter, the wavemaker moves the whole water back and forth. Hygger Nano Wave Maker Aquarium Powerhead is one of the best aquarium powerheads that workes also as a wavemaker.