RST Inc. was started in 1989 by Richard Trethewey and has represented a series of high end, mostly hydronic (water based) heating products. Originally called Radiant Systems Technology, they pioneered radiant and better heating products. They have enjoyed a reputation for high levels of technical and sales support for the contractor and wholesaler sales staff and have grown consistently through the twenty years. RST Thermal is located at 372 University Avenue, Westwood, MA 02090. Their office number is 781-320-9910 and fax is 781-320-9906.