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.
1 When your hot water heater turns on the water expands as it heats. 2  That creates pressure within the water heater tank. 3  In non technical terms, if you have what is called an âopenâ system, this extra volume of water can flow back into the main to the city if it needs to.ttach a hose to the drain valve at the bottom of the tank. Run the other end of the hose to lower place where you can drain rusty hot water without causing damage. Open a hot water faucet in the house to let air into the tank.