People often ask why they have a pipe on the side of their hot water system that doesn’t go anywhere or appear to do anything. In fact this is perhaps one of the most important safety devices in your home. This pipe originates from the temperature and pressure relief valve which releases the pressure building up inside your hot water system as a result of heating water. Your temperature and pressure relief valve is a non-serviceable item. However, as per manufacturers recommendations it should be changed every 5 years in order to prolong the life expectancy of your hot water system. The replacement of your temperature pressure relief valve should only be carried out by a licenced plumber.