50W included with my Aqueon setup, though this heater is currently in my smaller (~4g) tank because the little heater did not effectively heat. Seems to work fine, but there are air bubbles coming from it. Small, itty bitty ones, but they're coming pretty steady. I am alarmed because I had an old heater get water inside and heat my small tank to 100F through a malfunction. I'm watching the temp, no problems. Jw if this is a normal result of the water heating?