More people are using their oil boilers not only to heat their homes, but to produce domestic hot water too. That means hot water for sinks, tubs, showers, washing machines, etc. This is commonly done through an indirect-fired water heater, which connects to your boiler. In fact, four out of every five boiler installations we do now include the addition of an indirect-fired water heater.
This type of water-heating system provides a unique advantage for people with oil heat. Indirect fired water heaters are only practical if the water in the tank can be heated quickly. Oil heats water very quickly. Indirect-fired units are less common in gas-heated homes because gas-fired systems produce hot water at a much lower rate than oil.