Cinderella designed their solution to be nice and quiet. It is no lauder then a dishwasher. It is a bit quieter when the exhaust vent is installed outside vs in the room. In all my years working here, I have never had one person call and complain about the noise so I guess it can't be too bad :) The power supply would depend on whether you purchase the Comfort electric model or the Freedom propane model. The electric model requires a 220v 10amp circuit and the propane model only requires a small amount of 12v DC power to run the exhaust fan.