The elegantly curved shape of the Harvia 6kW Spirit Heater exude a natural design, accentuated by the round sauna stones. This electric heater creates a modern, yet, elegant atmosphere and heats up quickly to your desired feel. It has two separate safety sensors with one monitoring the heater and one monitoring the temperature of the sauna space to prevent overheating. The Harvia Spirit Heaters are compatible with the Harvia Xenio Controls. Required Xenio Control and a minimum of 110 lbs Sauna Stones sold separately. Stylish and high-quality Finnish made sauna heater Heats up the sauna very quickly Integrated safety functions ensure safe use Recommended amount of 110 lbs or 50 kg stones Compatible with theHarvia Xenio Controlssold separately Safety Device on top of the Heater Installation and Operation Manual