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.
Heating water causes calcium carbonate to precipitate out and settle to the bottom of the water heater. Water that gets under this layer of sediment can turn to steam when the burners come on and cause popping and other noises.egular flushing of the water heater through the drain valve can help prevent sediment build up. Sediment can reduce the efficiency of the water heater and get into re-circulating lines and cause problems with circulating pumps and check valves.