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.
Cloudy Hot Water Hot water will sometimes be cloudy due to the physics of heating and moving the water through a pressurized system. As water is heated, the gases dissolved in the water will escape. (That's why most water heaters have a pressure release safety device.) As the hot water is released at the tap, the gases immediately begin to separate from it. The cloudy water will clear quickly. Dissolved air in the water will not harm you or damage your plumbing or appliances.