Superior Radiant’s SRP Modulus adaptive modulating infrared tube heater provides thermal efficiencies in excess of 80%. Rates range from 80,000 to 200,000 Btu/hr., with a 40% modulating differential. The built-in quick-start function ramps up to high power resulting in optimum temperatures achieved almost as soon as the heater is turned on. Features include lengths of 20’ to 60’, NG or LPG.