Gas Fitter Test 2026 – 400 Free Practice Questions to Pass the Exam

The type of water heater that relies on oil-fired heating in combination systems is a storage-type heater. This type of heater typically includes a tank where water is heated and stored for later use. In combination systems, the oil-fired component heats the water in the tank, providing a steady supply of hot water for household needs.

In a storage-type heater, the stored hot water can be readily available for use, which is particularly beneficial in situations where there is a higher demand for hot water. This design allows for efficient use of the oil heating system, combining both storage for immediate use and reliance on an oil-fired unit as the heat source.

On-demand heaters and tankless systems operate differently. They heat water only as needed, which means they do not incorporate a storage component, and while they can be energy efficient, they do not primarily rely on an oil-fired heating source in the same way a storage-type heater does. Direct vent heaters are also different, as they primarily refer to venting mechanisms rather than the heating method, while storage-type heaters specifically correlate with a tank system that uses oil as a heating fuel.