PJ Series type convector is designed with low operating temperatures and is UL listed. This is a rugged, wall mounted, tamper resistant convection heater designed to provide heat in correctional or rehabilitation institutions where safety is a major concern. 140ºF maximum surface temperature in a 70ºF ambient. Internal tamper resistant thermostat with 55º to 100ºF range 12 gauge perforated steel, sloped top cover.