The square Huurre has an undulating surface. The surface material is cast stone, which has never before been used for sauna heaters. The colour and design of the heater is a perfect match with both dark and light sauna interiors. Thanks to the small safety distances of the heater, it can be integrated into the benches and placed more freely within the sauna. The large stone compartment provides a long, humid and soft heat. The heater can be connected to a KNX building automation system.