Our standard model is a 4-station unit, working from a single phase heater 3Kw element and fan. Drying time for an aqualung cylinder is approx. 30 minutes depending on cylinder size. We also have a high-powered model, working from a pressure blower, over a 9KW heater. This can be either 4 or 6 station and dries an aqualung cylinder in approx. 6 to 10 minutes. This unit is designed primarily for the larger cylinder.