Product details:

This Buddy 18000 BTU Propane Patio Heater has the capacity to heat up to 400 square feet of space for up to 220 hours. The Dual-Heating System (DHS) combines radiant heat comfort with convection heat airflow for maximum heating efficiency. Multi-position heat settings of 4000 and 9000 and 18000 BTU/HR control comfort level. Built-in oxygen shutoff sensor and tip-over switch ensure indoor safe operation. Certified by CSA International (American gas association).