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.
By scheduling annual draining and flushing of the tank and other inspections, you can extend the life of the water heater and save yourself money and unexpectedly cold showers. 1  1. How to Make Your Water Heater Last Water heaters have a few main components âthe thermostat and the water tank. All water heaters will also have an inlet pipe for cold water, and outlet pipe for hot water. Besides, a gas water heater will have a pilot light and a temperature and pressure valve. An electrical water heater will have a heating element while a gas water heater will have a burner. To ensure that your water heater lasts longer you need to protect all of these parts. If the tank of the water heater is corroded, it needs to be replaced to prevent leaks and water floods.