Engineered to deliver reliable, directional heat, L.B. White Tradesman portable heaters feature a unique 3-trial ignition system, the industry's heaviest gauge combustion chamber and burner plate, and Self Diagnostic Service Saver models for convenient trouble-shooting. L.B. White has perfected every aspect of our portable construction heaters design to withstand harsh working environments. This has led to our reputation for reliability, durability and serviceability in the field. When the comfort and safety of your work crew is at stake… you want the leader in portable heating equipment for any commercial, industrial or construction job… L.B White.