Helo and worlds-renowed designer, Ristomatti Ratia, created the ultimate sauna heater - the Helo Saunatonttu. Incorporating several patented features and superb European design, the Saunatonttu is truly the "Best sauna heater in the world", bar none. The secret of Saunatonttu is in the constant heat retaining by the large quantity of rocks (ca. 100 kgs) within the super-insulated heater. Super insulated heater Because Saunatonttu is insulated it can store the heat generated by the small standby power (300W). As a storage heater, Saunatonttu makes it possible to have a sauna session whenever you prefer without planning or preheating the sauna. Constant heating The quantity of rocks is no less than 100 kg. The large rock quantity makes it possible to have a sauna session with the heat stored by the standby 300W power. Unique design Saunatonttu is part of the RATIA collection, ensuring world-class design with the latest innovations and functionalities.