The HL2 Series infra-red tube heater by Re-Verber-Ray® couples the energy savings of two-stage technology with the highest quality features available. Features include highly emissive aluminized steel emitter tubes, mirror-finished aluminum reflectors, self-diagnostic controls and more. Stainless steel upgrades are available for harsh environments. Independent studies have recognized annual fuel savings as high as 50 percent over conventional forced air heating.