Oil Filled Radiator vs Convection Heater: What to Source

You're sourcing heaters for a market that's split between two technologies, and the choice affects your warranty claims, your freight costs, and your customer reviews. Let's cut through the marketing.

Oil filled radiators and convection panels both heat a room, but they do it differently. The oil radiator heats a thermal mass (the oil) and then radiates heat slowly. A convection panel pulls cold air in from the bottom, passes it over a heating element, and pushes warm air out the top. That difference changes everything.

Heat-up time and feel

A 1500W oil filled radiator takes about 20-30 minutes to feel warm on the surface. A 1500W convection panel blows warm air within 2-3 minutes. For a buyer who wants immediate warmth in a bedroom or office, convection wins. For a buyer who wants steady, lingering heat that doesn't dry the air as much, oil wins.

But "doesn't dry the air" is a half-truth. Both technologies lower humidity. The oil radiator just does it slower. If your customer is comparing oil filled radiator vs convection heater, tell them to think about the room's use, not the marketing claims.

Running cost and efficiency

Here's the blunt part: both are roughly 100% efficient at converting electricity to heat. A 1500W oil radiator and a 1500W convection panel will cost the same per hour to run, assuming the same thermostat setting. The difference is in how long they run. Oil radiators hold heat after the element cycles off, so they can feel more stable. Convection panels cycle on and off more frequently, which can make a room feel drafty if the thermostat is poorly placed.

If your customer asks about an energy efficient electric heater, the real answer is about thermostat accuracy and insulation, not the element type. A unit with a decent thermostat that holds within 1°C will save more money than any "infrared" or "ceramic" gimmick.

Wall mounted electric heater vs portable

Oil filled radiators are heavy. A typical 2000W unit weighs 25-30 kg filled. That's a freight problem. A wall mounted convection panel at the same wattage weighs 4-6 kg. If you're importing containers, that weight difference eats your margin. Many distributors now prefer wall mounted electric heater models for bedrooms and living rooms because they save floor space and cut shipping weight by 70%.

But wall mounted means installation. Your customer needs to know if the unit comes with a bracket, if it's IP24 rated for bathrooms, and if the wall can take the weight. For an oil radiator, no installation is needed. That's still a selling point for renters.

Real comparison numbers

Let's use a typical 20m² bedroom with poor insulation in the UK. At 5°C outside, a 1500W convection panel will raise the room to 20°C in about 45 minutes. An oil filled radiator needs about 1 hour 15 minutes. After both reach temperature, the oil radiator will cycle on for 6 minutes every 20 minutes. The convection panel will cycle on for 8 minutes every 15 minutes. Over 8 hours, the oil radiator uses about 2.4 kWh less because it holds heat longer. At UK electricity prices (30p/kWh), that's 72p saved per night. Over a 5-month heating season, that's roughly £110. That's real money for an end user.

But the oil radiator costs more to ship, and it's a pain to move. So the sales pitch depends on your market. If you're selling to landlords who want low running costs and don't care about weight, oil is fine. If you're selling to Amazon customers who want a quick install and no shipping damage, convection is safer.

What we see in OEM orders

At our factory, we make both. Since 2009, we've built wall mounted convection panels, oil filled radiators, infrared units, and industrial fan heaters. The trend is clear: convection panels outsell oil radiators 3 to 1 for bedroom and office use. Why? Two reasons. First, shipping weight. A 40-foot container holds about 1,200 convection panels or only 400 oil radiators. Second, smart controls. Convection panels are easier to fit with wifi thermostats, and buyers now ask for wifi smart electric heater models as standard.

Oil radiators still have a loyal base in garages and workshops, where a silent electric heater is a must and weight doesn't matter. But for a private label brand targeting modern homes, convection is the safer bet.

Thermostat and safety

Don't skip the thermostat. A cheap bimetal thermostat can swing 5°C, which makes the room feel cold and the heater run longer. We use capillary thermostats on our convection panels, with a 1°C differential. That's a spec you should put in your product listing. Also check the safety cutout. Both types should have overheat protection and a tip-over switch if they're portable. For wall mounted units, make sure the bracket is metal, not plastic. We've seen cheap plastic brackets fail after two seasons.

Sourcing advice

If you're sourcing from China, ask the factory for the actual thermal efficiency test report, not just a CE certificate. Many factories claim "energy saving" but don't have real numbers. Ask for the heating curve at 5°C ambient. Ask for the surface temperature of the casing. A good convection panel should have a surface temp below 60°C on the front, so it's safe for kids. A poor one can hit 80°C.

MOQ for our convection panels is 200 pcs per model. Lead time is 25-35 days after deposit, depending on the color and whether you need custom logos. For oil radiators, MOQ is 300 pcs because the tooling for the steel panels is more expensive. If you're just starting, we recommend a standard white panel with a mechanical thermostat. That's the fastest to certify and the easiest to sell.

Honest takeaway

Don't pick a technology because it's trendy. Pick based on your customer's room size, their tolerance for weight, and their shipping budget. Convection panels are cheaper to ship and easier to install, but they don't hold heat after the power cuts. Oil radiators are heavy and slow, but they give a steadier warmth. If you're selling to a market with cold winters and high electricity prices, oil radiators can justify their freight cost. If you're selling to a market with mild winters, convection panels will move faster and cost less to land. Know your numbers before you order.