TheraSauna® uses proprietary, high glass-content, solid-ceramic TheraMitters™ at the proper watt/density for deep body penetration to induce profuse sweating and thereby detoxifying the human body. Solid ceramic heaters have a 96% radiant efficiency rating. Therasauna full spectrum far infrared saunas are made in the U.S.A. with the patented control system that allows for complete control and the ability to consistently reach the desired far-infrared micron level of 9.4. Our patented StableHeat™ technology helps create the most constant and beneficial levels of far infrared TheraSauna® is the only company to use aspen hardwood, which is non-toxic and non-allergenic. Our far infrared saunas utilize high glass content solid ceramic TheraMitters™ that meet or exceed manufacturer specifications to provide the best and most beneficial levels of infrared. TheraSauna® full spectrum saunas meets the electrical requirements to be ETL and CE certified in the US, Canada, and Europe TheraSauna® full spectrum saunas emits very low levels of EMF, compared to the high levels of EMF produced by saunas using less efficient carbon fiber materials and rod TheraMitters™. TheraSauna®'s parent company, QCA Spas, is the only certified American manufacturer of far infrared saunas and has been in business since 1966