Size Natural Gas Size Propane
16" N/A 16" 39,000 BTUs
19" N/A 19" 39,000 BTUs
18" 75,000 BTUs 18" 50,000 BTUs
24" 90,000 BTUs 24" 65,000 BTUs
30" 90,000 BTUs 30" 65,000 BTUs