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.
So keep your hot water temperature lower and youâll save more energy. The default setting on most water heaters is 60C or 140F, but the best hot water temperature is 49C or 120F â this will save you about 25% of your hot water heating costs.he default setting on most water heaters is 60C or 140F, but the best hot water temperature is 49C or 120F â this will save you about 25% of your hot water heating costs.