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.
1 The national average price of gasoline in 2012 was $3.60 a gallon, which is the most expensive annual average on record. 2  The previous annual record was $3.51 a gallon set in 2011, while the third most expensive year for gas prices was 2008, when the average was $3.25 a gallon.