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.
The hot water heater also provided the heat through an exchanger or some sort and the air was blown over it to heat it. The problem I had (and this was 5 years ago, with a 10 yr old unit) is that when it was heating the house and pulling hot water for successive showers, it became warm water and not hot water. water heater) for a solution that is theoretically much. better but in real life is crappy. hyo silver said: â. If your domestic hot water needs are small, you might want to consider a smaller on-demand unit, which eliminates the inefficiency of having to keep the water hot all the time.