Infrared sauna heaters have become popular in the United States and have been sold in US since 1981. However, the technology has been used since 1900s. In Japan, the first infrared heaters were patented during late 1960s, and were used exclusively by medical practitioners. In Germany, physicians used it as a whole body therapy. Later on, these heaters were released to the public for personal use. Today, these heaters are gaining popularity around the word, due to its therapeutic benefits.