There are numerous methods for boiling water, as well as various burners available. Boiling 4 quarts of water on a 15,000 BTU burner from 50°F to 212°F takes 11 minutes. On a decent Natural Gas burner stove, it takes 5 minutes to bring 4 quarts (1 gallon) of water to a boil, or 9-10 minutes on an 18,000 BTU burner. On a 7,000 BTU stove, it normally takes 15 to 20 minutes.