The time it takes to boil one gallon of water on an electric hot plate as a stove top burner can vary depending on several factors, including the power rating of the hot plate, the initial temperature of the water, the surrounding room temperature, and the altitude (as it affects boiling point).
As a rough estimate, an average electric hot plate with a power rating of around 1000 to 1500 watts may take approximately 10 to 20 minutes to bring one gallon (about 3.8 liters) of water to a rolling boil at sea level and at room temperature (around 20°C or 68°F).
However, keep in mind that these estimates can vary significantly based on the specific hot plate's wattage, the starting water temperature, and the environmental conditions. For instance, if the water is already at a higher temperature, it will take less time to boil.
Additionally, higher altitudes can affect boiling times since water boils at lower temperatures at higher elevations due to the decreased atmospheric pressure. At higher altitudes, the boiling process may take slightly longer.
To get a more accurate estimation for your specific setup, it's best to refer to the hot plate's manufacturer guidelines or conduct a simple test with your hot plate and a gallon of water. Always keep a close eye on the boiling water and never leave it unattended to ensure safety.