A kilo of pancakes directly heated by briquettes (semi-bituminous coal or anthracite) is 0.22 yuan, and a kilo of pancakes heated by coal instead of gas needs 0.2 1 yuan. The cost of gas (liquefied gas) is a little higher than that of 1. 1 yuan, and 0.9 kwh of electricity is needed for electric heating of a kilo of pancakes. The best heating method is coal to gas heating, followed by direct heating of briquettes.