What are the oil filled radiant heaters? The Ultimate Guide

Oil filled radiant heaters are a popular type of electric space heater used to keep indoor spaces warm and comfortable. They utilize heated oil and a combination of convection and radiant heating to efficiently transfer warmth into the surrounding air. Compared to fan forced heaters, oil filled radiators operate very quietly while still being capable of heating medium to large sized rooms in a home or office.

In this comprehensive guide, we‘ll explore what sets oil filled radiant heaters apart from other electric heating options, their pros and cons, how they work, safety considerations, operating costs, and how to choose the right size heater for your needs.

What is an Oil Filled Radiant Heater?

An oil filled radiant heater, sometimes called an oil filled radiator, is an electric heater that uses inert mineral oil as the heat transfer medium instead of metal or ceramic heating elements. The oil is sealed inside a metal reservoir with heat fins and slowly heated by an internal electric heating element.

As the oil heats up, it evenly distributes heat throughout the column of the radiator. The radiator then transfers warmth into the surrounding air through a combination of radiant heat, natural convection, and some level of thermal radiation.

This results in a gentle, uniform warmth being emitted across the surface of the heater, quietly heating up a room without the need for a noisy fan. The oil also retains and emits heat for a period of time after being switched off.

Benefits of Oil Filled Radiant Heaters

There are several notable benefits that make oil filled radiant heaters a popular choice:

Energy Efficient – The sealed oil design minimizes heat loss, allowing most of the heat to be transferred into the room efficiently. They use less energy compared to other types of space heaters.

Cost Effective – Oil filled heaters are economical to operate, costing only a few cents per hour to run. The initial purchase price is also affordable.

Quiet Operation – Without noisy fans, oil filled radiators operate very quietly. The gentle warmth makes them ideal for bedrooms or home offices.

Safe – Enclosed oil can‘t spill or ignite easily. The outside casing also remains cool to the touch for added safety.

Adjustable Thermostat – Many models have built-in thermostats or adjustable dials to customize the amount of heat produced.

Portable – Compact and lightweight units have integrated handles, making it easy to move them room to room.

Can Heat Large Rooms – Powerful models with higher wattage ratings can heat medium to large sized rooms in a home.

How Do Oil Filled Radiators Work?

Oil filled heaters operate on a simple concept while producing effective heating results:

Sealed Oil Core – The inner reservoir is filled with a mineral oil that easily retains and conducts heat. Shells are typically made of aluminum for optimal heat transfer.

Electric Heating Element – An internal electric heating element at the base slowly heats the oil when turned on. Temperatures can reach up to 150°F.

Radiating Fins – Thin aluminum fins surround the outer shell, acting as heat emission surfaces. The high surface area allows heat radiation into the room.

Natural Convection – As the oil heats and rises, cooler oil sinks creating a natural convection current for gently circulating warm air.

Radiant Heat Transfer – The infrared radiation emitted directly heats objects like floors, furniture, and your body within line-of-sight of the heater.

This combination of radiant and convective heat allows an oil filled heater to maintain a consistent, comfortable ambient temperature within an enclosed room.

An internal diagram of an oil filled radiator‘s sealed oil core and heating element.

Pros and Cons of Oil Filled Radiators

Pros:

• Energy efficient
• Lower operating costs
• Quiet operation
• Portable and lightweight
• Safe enclosed heating design
• Built-in thermostats on some models
• Can heat medium to large rooms effectively

Cons:

• Slow to initially heat up room
• Oil can leak over time
• Large units can be cumbersome to move
• Higher upfront cost than some other space heaters
• Limited style options compared to more decorative heaters

Safety Features and Precautions

Oil filled heaters are designed to be safe and minimize risks of fires or burns, especially compared to heaters with exposed heating elements. However, basic safety practices should still be followed:

• Place on flat, stable surfaces away from foot traffic to prevent tipping.
• Keep 3-4 feet clearance from drapes, furniture, and other flammables.
• Don‘t leave operating unattended for long periods.
• Ensure no oil leaks develop over time.
• Clean dust buildup on exterior to prevent overheating.
• Use integrated handles when moving and allow oil to cool before changing locations.
• Avoid positioning in wet areas or locations where water damage could occur.
• Unplug when not in use to prevent electric hazards.

Responsible use greatly minimizes any risks of fires or accidents. Be sure to also follow the manufacturer‘s safety recommendations for optimal operation.

Operating Costs: Are They Expensive to Run?

One of the biggest advantages of oil filled radiant heaters is their energy efficiency and affordability to operate. Running costs are comparable to other electric space heaters but generally cheaper than continuously running a central furnace.

Heating cost depends on the wattage rating and local electricity rates. A common 1500 watt oil filled radiator at 15 cents per kWh would cost about 5 cents per hour to run. So keeping it on for 8 hours would use around $0.40 of electricity.

Lower watt models use even less energy, while larger 2500+ watt heaters may cost up to 10 cents per hour to operate. This is still inexpensive compared to the energy needed for central heating or non-electric alternatives like propane heaters.

Using an automatic timer or thermostat can further reduce costs, preventing the heater from continuously running when temperatures are already sufficiently warm. Overall, oil filled radiators provide very economical zone heating for any area you need additional warmth.

Sizing Oil Filled Radiators for Room Requirements

Choosing the right wattage heater for room size is important for providing adequate warmth. The basic estimate is around 10 watts per square foot of space.

So for a 150 sq ft bedroom, a 1500 watt heater would sufficiently cover the area. Large master bedrooms may require 2500+ watt heaters. Small 100 sq ft offices could use smaller 750-1000 watt models.

Some other factors impacting heating needs include:

• Level of insulation – Poorly insulated spaces need more heating power.

• Number of windows – More windows mean greater heat loss.

• Ceiling height – Heat rises so taller rooms require a more powerful heater.

• Climate – Colder regions need stronger heat output to reach comfortable temps.

• Layout – Open floor plans need more heating than smaller closed rooms.

Oil filled radiators are capable of heating 150-300 sq ft well depending on the wattage. Combining a portable heater with central heating can make heating a larger home more affordable.

Comparison to Other Types of Space Heaters

Oil filled radiators areenergy efficient and affordable to operate but slower to heat up initially. They offer radiant warmth great for localized zone heating rather than whole home heating.

Ceramic fan heaters use electric coils and widespread heat circulation from a fan. They heat up fast but noisy fans can be disruptive in quiet environments. Operating costs are similar to oil filled heaters.

Infrared quartz heaters emit intense radiant heat from quartz heating elements. They provide instant spot heating but higher operating costs than other electric options.

Gas space heaters like propane models provide powerful heat output, but require ventilation and do not have thermostat controls. Ongoing fuel costs make them less economical long term.

Wood pellet stoves offer zone heating powered by compressed wood pellets. Low electricity use makes them very affordable, but they require maintenance and wood pellet purchases.

Overall oil filled radiators offer a great balance of safety, performance, and operating costs for effectively heating medium to large rooms in a home.

Is an Oil Filled Radiator or Central Heating More Affordable?

Using an oil filled radiator as a secondary heat source is generally more affordable than solely relying on a home‘s central heating system.

Central heating like a gas furnace typically heats an entire home. Oil filled radiators provide targeted heating only where needed, saving energy by not heating unused rooms.

Leaving central heating on at lower temperatures then adding portable radiator heat in high use rooms results in lower costs than heating a whole home toasty warm.

Radiators also lack ductwork and installation costs associated with central heating. Their zone heating maximizes efficiency in the specific living spaces occupied.

For homeowners wanting to add heating to drafty rooms or provide temporary extra warmth, oil filled radiators present an economical solution without the need for property modifications.

Environmental Impact

A downside of oil filled radiators, along with most electric heating appliances, is they ultimately rely on electricity generated from power plants. This indirectly contributes to environmental pollution if the electric grid relies on fossil fuels like coal or natural gas.

However, the efficiency of the sealed oil design minimizes electricity usage and carbon emissions. Using an energy efficient radiator selectively for zone heating produces far less emissions than heating an entire home.

For homeowners wanting to minimize their carbon footprint, combining an oil filled radiator with home insulation upgrades and partial central heat can create an environmentally responsible and affordable heating strategy.

Conclusion

Oil filled radiant heaters provide an versatile option for keeping your home comfortably warm. Their sealed oil heating technology allows silent operation and efficient radiant and convective heat circulation to warm rooms rapidly.

With affordable operating costs comparable to other electric heaters and safer design than alternatives with exposed heating elements, oil filled radiators are an economical way to produce supplemental heat anywhere you need it. Just be sure to follow basic safety precautions and size your heater appropriately for room requirements.

Adding an oil filled radiator to your home‘s central heating provides an energy efficient dual heating approach personalized for your living space usage needs. Just look for models with reliable thermostats and timers to conveniently manage the settings and maximize cost savings all winter long.