KIP Series 4.5kW Sauna Heater Package, Stainless Steel The Harvia KIP 4.5kW Sauna Heater Package comes complete with the KIP45W Sauna Heater, Xenio Wi-Fi Control, and Sauna Stones. This traditional stainless steel heater has a dual wall construction that allows the exterior to remain cool to the touch and heats up fast in sauna rooms from 100 to 210 cubic feet (CF).