How often are oil burners typically in the off cycle?

Oil burners typically spend a significant portion of their operational time in the off cycle, predominantly because they are designed to provide heat only when there is a demand. The off cycle occurs between the heating cycles when the thermostat has reached the desired temperature, allowing the burner to shut down until additional heating is needed.

Having a high percentage of time in the off cycle, such as 85%, is typical for modern oil heating systems. This efficiency is due to the ability of these systems to maintain temperature effectively, reducing fuel consumption and minimizing wear on the equipment. Partnering with thermostats and zoning controls helps enhance this off cycle duration.

In contrast, percentages like 50%, 75%, or 25% would indicate a less efficient system or one that is poorly calibrated, leading to more frequent cycling to maintain heat, which can increase fuel use and the risk of mechanical issues over time. Therefore, recognizing that the off cycle is around 85% highlights the efficiency of oil burners in responding to thermal demand without excessive operation.