The Radiant Panel Association (RPA), founded in 1994, was a non-profit trade organization representing the radiant and hydronic comfort industries with standards and programs for installation, education, public awareness and events. In January, 2012, RPA joined the International Association of Plumbing and Mechanical Officials (IAPMO). The RPA is now known as Radiant Professionals Alliance. To partner with our members to provide superior leadership in the radiant and hydronic industries.