How Do Oil Filled Radiators Work to Heat Your Space
By John Karbowski · November 19, 2024
Oil filled radiators are a popular heating option for supplemental space heating in commercial and residential settings. They're quiet, efficient, and provide long-lasting warmth even after being turned off. Understanding how they work helps you use them effectively and understand their electrical requirements.
The Basic Operating Principle
Oil filled radiators use electrical resistance heating elements immersed in a sealed reservoir of diathermic oil. The electric element heats the oil, which then circulates through the radiator's fins by convection, releasing heat to the surrounding air. The oil itself is never consumed — it acts as a heat storage and transfer medium.
Key Advantages of Oil-Filled Radiators
Thermal Mass = Sustained Heat
The oil retains heat for a long time after the heating element cycles off, providing steady warmth without the temperature swings of direct resistance heaters. This also means the unit cycles on and off less frequently, saving energy.
Silent Operation
Unlike forced-air heaters, oil-filled radiators have no fan. Heat is distributed by natural convection and radiant emission, making them ideal for quiet environments like offices and server rooms.
No Burned Air or Dry Heat
Because there's no exposed heating coil blowing air, oil radiators don't burn dust or reduce air humidity the way fan heaters do. This makes them more comfortable for extended use.
Safe Surface Temperatures
The outer fins of an oil radiator reach temperatures lower than bare resistance heating coils, reducing the risk of burns and fire from contact with materials.
Electrical Considerations for Oil Radiators
Standard oil-filled radiators draw 1,000–1,500 watts on a 120V circuit, placing them near the upper limit of a standard 15-amp outlet. If you're using multiple heaters or a larger commercial unit, ensure your circuits are properly rated. Commercial or industrial facilities using electric heating as a primary source should consult with a licensed electrician to ensure the electrical system can handle the load safely.
- Never use extension cords with oil-filled radiators
- Each heater should plug directly into a properly rated outlet
- Avoid sharing circuits with other high-draw appliances
- Commercial facilities should have dedicated heating circuits
- Consider a load calculation before adding significant electric heating
Commercial Electrical Services in Houston
Need electrical circuits added or upgraded for heating equipment? Southern Electrical Services handles all types of commercial and industrial electrical work in the Houston area.