BTU Ratings by “CSA International” —Certified & Approved by CSA International— All Styles & Model #'s With Natural Gas With Propane 36" & 30" Sets 95,000 BTUs 85,000 BTUs 24" & 18" Sets 75,000 BTUs 70,000 BTUs 15" Sets 59,000 BTUs 55,000 BTUs IMPORTANT: All propane gas require safety pilot valves, and many States require safety pilot valves for natural gas as well. Check with the Building and Safety Dept. of your city or county.