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.
To test your hot water heater temperature: 1  Turn on any faucet in your home or place of business. 2  Let the water run an the hottest setting for at least two minutes. 3  Fill a large glass container with water.  Check the temperature with a standard kitchen 1  thermometer. If the temperature is over 120 degrees, adjust your hot water heater.