Characteristics: Bismuth is a brittle, silvery-green metal that has a low melting temperature and high specific gravity. Being both stable and non-toxic, bismuth is often used as a replacement for toxic metals such as antimony, cadmium, lead and mercury.
1 (Minimums vary by location and tank size, and can range from 100-1,500 gallons.) More often, the propane company charges a fee of anywhere from $25-$250 a year but averaging around $75-$130 annually, depending on local rates, the size of the tank and whether it's aboveground or underground.
Propane is measured by the gallon so propane is priced per gallon. During the 2011-2012 heating season propane prices ranged from $2.74 to $2.88 per gallon, meaning that a 500-gallon tank cost between $1,100 and $1,150 to fill. That propane prices have increased over the last 10 years does not mean that, compared to other sources of energy it is necessarily more expensive.