To avoid confusion over debits and credits, avoid thinking of them in the way that they are used in everyday language, which often refers to a credit as increasing an account and a debit as decreasing an account. For example, if our bank credits our checking account, money is added to it and the balance increases.
One way to reduce the frequency of this occurrence is to maintain an air pocket at the top of the water heater tank. This air pocket will form in the tank by design - however, it will be reduced over time by the everyday use of your water heater. To replenish this air pocket: Turn off the water heater.
After installation of the water lines, open the main water supply valve and fill the. water heater. While the water heater is filling, open several hot water faucets. to allow air to escape from the water system. After a steady stream of water. flows through the faucets, close them and check all water connections for.