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.
The average cost to refill a propane tank will depending upon the size of the tank, the geographical location, and the company doing the job. On average, a 10 pound tank is going to cost anywhere from $12 to $22 per tank. A 20-pound tank can cost upwards of $29 to $40 per tank to refill. A 100-pound tank can cost upwards of $65 to as much as $80 per tank. This is much cheaper per pound and will last a lot longer. Keep in mind that most stores will have a limit on the amount of propane that they can refill at any given time.