What is the typical control voltage for an oil-fired furnace?

The typical control voltage for an oil-fired furnace is 24 volts. This low voltage is commonly used in HVAC systems to improve safety and reduce the risk of electrical shock during maintenance and operation. The control circuits in oil-fired furnaces, including components like the thermostat, relays, and safety controls, are designed to operate efficiently at this lower voltage level.

Using 24 volts also allows for the use of smaller, more manageable wiring and components, which can easily accommodate the necessary control functions without the risk of overheating. This standardization across many HVAC systems helps ensure compatibility and ease of troubleshooting, making it a practical choice for residential and commercial heating applications.