The 10.5kw Ultimate heats up to 525 cubic feet (length x width x height). Enjoy all Stainless Steel construction, Industrial low-density silver solder Incoloy elements and a 3 level adjustable rock tray. It?s Saunacore?s most option-packed heater. Saunacore heaters offer both outstanding safety and energy saving features, as well as sleek, high technology design that can be used wet or dry. The innovative ventilation system allows these heaters to run up to 50 degrees cooler than most heating units on the market. With Saunacore sauna heaters, you get your choice of mechanical controls built into the base of the heater, or mechanical wall-mount controls for mounting adjacent to your door outside of your sauna. You can also upgrade to the popular Mercuri Digital Control. This heater is available in 240 volts single phase or 208 volts three phase. Includes Sauna Stones Dimensions: 16?w X 24?h X 12?d 240v/1ph, 43.8 Amps, 6 Gauge Wire ? 208v/3ph, 29.2 Amps, 8 Gauge Wire This product ships within 2 - 3 weeks from time of order.