Historical price data for New Hampshire. Per Million BTU. Fuel Oil (#2), $2.77 / Gallon, 138,500, 80%, $24.98. Propane, $2.94 / Gallon, 91,333, 80%, $40.27. Heating oil is a low viscosity, liquid petroleum product used as a fuel oil for furnaces or boilers Heating oil produces 138,500 British thermal units per US gallon (38.6 MJ/l) and weighs 8.2 pounds Number 2 fuel oil has a flash point of 52 °C (126 °F). ASTs are used for smaller installations due to the lower cost factor. View today's average UK heating oil price and work out when the best time to buy is with our daily price chart. Every day we check the cost for 1,000 litres of heating oil (Kerosene 28) from every participating supplier in our 500 litre minimum We check prices of 150+ oil suppliers. Select your delivery option. 2.