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.
Tank-style electric water heaters use two heating elements to warm the water, one at the bottom and one nearer the top. Power surges, mineral build-up and age can cause either element to fail or burn out. If your water heater produces only lukewarm water, suspect a bad top element. If it produces hot water in short supply, the probable cause is a bad bottom element. Test both to be certain. Follow these steps to check the heating elements in a hot water heater.