The time it takes to boil 6 quarts of water on a residential gas stove in the US can vary depending on several factors:
Gas Burner Output: Gas stoves come with burners of different sizes and heat outputs. The higher the BTU (British Thermal Unit) rating of the burner, the faster it can heat up the water.
Type of Pot or Pan: The material and thickness of the pot or pan used to boil the water can affect the heating time. A thicker-bottomed pot will generally distribute heat more evenly and boil water faster than a thinner one.
Altitude and Room Temperature: The altitude of your location and the initial temperature of the water and the room can influence the boiling time. At higher altitudes, water boils at a slightly lower temperature due to reduced atmospheric pressure, which can increase the boiling time.
Efficiency of Stove: The efficiency and condition of the gas stove itself can impact the boiling time. A well-maintained stove with a properly functioning burner will heat more efficiently.
Covering the Pot: Using a lid to cover the pot while boiling can significantly reduce the boiling time by trapping heat.
Considering these factors, a rough estimate for boiling 6 quarts (1.5 gallons) of water on a gas stove in the US would be around 10 to 15 minutes. However, this is just an approximate time, and actual boiling times may vary. The best way to find the exact time it takes for your specific stove and pot combination is to conduct a timed test. Fill the pot with 6 quarts of water, place it on the burner, turn on the gas, and start a timer to measure the boiling time accurately.