I use wood to smelt my lead with great results I do use a fan to boost the heat. I can smelt the range lead in record times and WWs are a dream. I smelted some WWs last weekend while the fire was up to heat I dumped a five gallon bucket in walked to the drink machine to get something to wet my whistle by the time I got back about 5 mins my lead was ready to be dumped. It will put a lot of heat to the pot fast. Found it to be a lot better then my other fuel sources.