This economical, energy saving, OEM temperature controller, combines linear precision sensing, to give powerful output in a compact, single hole, fixing enclosure. It out-performs conventional thermostats by switching energy in complete mains cycle packs, eliminating radio and mains bourne interference. Proportional self adjustment every 40 seconds gives close temperature control of loads up to 16A. Absence of contacts with solid state switch ensures long life. It is suitable for temperature control of single phase resistive heaters, ovens, dryers and hot plates.