Oil Filled Radiator vs Convection Heater: Factory Comparison

We've molded, welded, and tested both. Here's the real difference.

How They Actually Work

A convection heater pulls cold air in the bottom, runs it across a hot element, and pushes warm air out the top. Simple. Fast. The moment you cut power, the warmth stops.

An oil-filled radiator heats a sealed diathermic oil inside steel fins. The oil holds heat, so when the thermostat clicks off, the unit keeps radiating for 20-30 minutes. That's the only real magic trick.

Heat-Up Time and Room Feel

Convection wins the sprint. A 2000W panel can raise a 15m² room by 5°C in about 15 minutes. Radiators are slower — 25-35 minutes for the same result. But radiators don't dry the air as aggressively because surface temps stay lower. For a bedroom, that matters. Buyers searching for a silent electric heater usually land on oil-filled because there's no fan noise, just a faint tick as metal expands.

Running Cost Reality

Both pull the same wattage. A 2000W unit on high for 8 hours uses 16 kWh. At £0.30/kWh that's £4.80. No way around the physics. The difference is how long the thermostat stays off. In a well-insulated room, an oil radiator cycles off more often because the oil keeps emitting. That can cut real-world consumption by 10-15% versus a convection unit that drops heat instantly. If a buyer asks for an energy efficient electric heater, don't promise miracles — explain duty cycle.

Wall Mount vs Portable

Convection panels are the go-to for wall mounted electric heater projects. Slim profile, 8-10cm deep, often 500W to 1500W. Great for bathrooms (IP24 needed) or offices where floor space is tight. Oil radiators are heavy — 12-18kg for a 2500W unit — so they stay portable with castors. No one wall-mounts an oil column unless it's a fixed industrial model.

Which Sells Better Where

Northern Europe: oil-filled outsells convection 3-to-1 in retail. Buyers want the residual heat and quiet operation. UK: convection panels with timers and WiFi move faster because homes are smaller and users want quick blast heat. North America: infrared and fan-forced convection dominate; oil is a niche.

Certifications and Sourcing

Don't ship without CE, RoHS, and UKCA if you're selling into the UK. ERP Lot 20 applies to all local space heaters — your factory must have the test reports. We run 200 pcs MOQ for private label electric heater orders. Lead time is 15-45 days depending on whether you need custom tooling for the fins or just a logo print. A standard 2000W oil radiator with 11 fins, 3 heat settings, and a 24-hour timer costs roughly $18-$22 FOB Ningbo. A comparable convection panel is $12-$16.

The One Thing Buyers Get Wrong

They think oil-filled means cheaper to run. It doesn't. It means more comfortable and quieter. If your customer wants fast heat in a garage workshop, sell them a fan heater or infrared. If they want a bedroom unit that won't wake them at 3am, oil-filled wins. Match the product to the use case, not the marketing sheet.

One honest takeaway: stock both. The margin on oil-filled is better, but convection panels close the sale for price-sensitive buyers. You need the full lineup to cover the aisle.