The Harvia Spirit Heater combines cutting-edge design and technology with exceptional performance. The Spirit is designed to hold over 120lbs of stones, providing significant steam when water is poured on the hot rocks. Additionally, the innovative internal air chamber creates air-flow through the heater, allowing the room to heat faster and to higher temperatures than standard heaters. A digital control pad allows you to control temperature and heat time of the heater, and the WiFi feature enables you to program and control your heater anywhere from your smartphone. The Spirit meets all UL safety standards and is manufactured by Harvia, the world leader in high quality, authentic sauna heaters. Fast heat-up time Significant stone capacity Exceptional steam Front and rear heat shields for added safety Internal air-flow channel to facilitate fast heat-up time and high temperature Meets all required US Safety Standards Digital Control Panel with WiFi Controls Included Stones are included in the purchase.