Reddy Heater Pro Tough Series. Heats up to 3,500 sq. ft. 150,000 Btu/Hr. Runs Approximately 12 Hours Per 13.5-Gallon Tank. Robust ISI Ignition (Intermittent Spark Ignition). 15% Quieter Than Other Similar Heaters! Rugged Roll Cage Construction. Wheelbarrow Design - Improves Portability & Maneuverability. Ergonomic Handles - Easier To Maneuver. Top Mounted Controls - Easier To View/Operate. Built-In Thermostat with LED Displays ? Ambient Temperature ? Thermostat Setting ? Diagnostic Codes For Monitoring Igniter/Voltage/Flame. Hinged Cover For Easier Serviceability. Built-In Fuel Gauge. 10 Rugged Pneumatic Tire. Large Lighted Power Switch With Weatherproof Cover. Extension Cord Storage. Power Outlet for Light Tools and Accessories. Patents Pending. 1 Year Limited Warranty. For Large Construction, Commercial and Industrial Applications.