Mr. Heater MH42T 42,000-BTU Propane Tank-Top Radiant Heater F273900 8,000- to 42,000-BTU triple tank-top propane infrared heater Operate 1, 2, or 3 burners at a time; runs up to 10 hours on low setting Efficient infra-red heat warms objects directly, not surrounding air For outdoor use only; shuts off automatically with loss of flame for safety Measures 15-3/4 by 6-1/2 by 22-1/2 inches; 1-year limited warranty