An oil heater, also known as an oil-filled radiator, is a type of electrical heater that uses electricity to heat oil contained within a sealed metal column. The oil is heated by an electric element and then circulates throughout the heater, transferring heat to the surrounding air via convection.

Oil heaters are generally considered energy-efficient due to their ability to retain heat for longer periods. Once the oil is heated, it retains the heat, allowing the heater to maintain a consistent temperature without constantly drawing power. However, their initial startup time can be longer compared to other types of heaters.

Oil heaters are typically safe to use as long as they are placed on a stable surface away from flammable materials and are not covered while in operation. They do not pose the same fire risk as space heaters that use open flames or heating elements that can overheat.

Many oil heaters come with built-in thermostats that allow users to set a desired temperature. Some models also offer programmable timers and digital displays for added convenience. Using a thermostat can help save energy by ensuring the heater only runs when needed.

To maintain your oil heater, it's important to clean the exterior regularly with a damp cloth to remove dust and dirt. Avoid using harsh chemicals or abrasive cleaners. Additionally, check the heater for any signs of damage or leaks, and follow the manufacturer's instructions for proper storage during the off-season.