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.
Figure 3 shows how it works: Step 1: Turn on any hot water faucet in the house for 1 second and then turn it off. Step 2: The circulation pump is activated. Step 3: Cool water from the hot line is circulated back to the water heater through the cold water line.Step 4: Enjoy hot water without wasting it down the drain.igure 3 shows how it works: Step 1: Turn on any hot water faucet in the house for 1 second and then turn it off. Step 2: The circulation pump is activated. Step 3: Cool water from the hot line is circulated back to the water heater through the cold water line.