Why should you drain your water heater? If you do not properly maintain and drain your water heater, it may cease to function altogether. Your water heater is one of the most neglected appliances in your household, until it stops working and you wind up in a cold shower. Draining it twice a year ensures the long life of your water heater by flushing out the minerals and other debris that can cause it to malfunction. If you are unsure about anything regarding your water heater, call a professional such as De Hart Plumbing. De Hart Plumbing, serving Manhattan Kansas, Junction City Kansas and Wamego Kansas.