The first inequality means that the distance between x and c is greater than 0 and that x â  c, while the second indicates that x is within distance Î´ of c. Note that the above definition of a limit is true even if f(c) â  L. Indeed, the function f need not even be defined at c.
Once inside a hot water heater, however, Legionella bacteria multiplies and is conveyed through the household plumbing, where it may be inhaled in the aerosol mist that accompanies showering, bathing or even washing dishes in a sink. Very young children and elderly people are particularly at risk.
Storage Water Heaters. Storage water heaters are by far the most common type of water heater in use in the U.S. today. Ranging in size from 20 to 80 gallons (or larger) and fueled by electricity, natural gas, propane, or oil, storage water heaters work by heating water in an insulated tank. When you turn on the hot water tap, hot water is pulled out of the top of the water heater and cold water flows into the bottom to replace it.