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.
What is the difference between a hot water boiler and a water heater? While hot water heaters and hot water boilers both heat water, a hot water heater elevates the temperature of water to 125 degrees and a boiler heats it to boiling, converting water to steam. Boilers are considered superior because they serve as a water heater and heating system in one.