Oil Filled Radiator vs Convection Heater: What to Source for Your Market

You're looking at two of the most common electric heaters for residential and light commercial use, and you need to know which one to put in your container. I've been building both since 2009, and the answer isn't "one is better." It's "which one fits your customer's room and expectations."

Let's get the basics down. An oil filled radiator heats a thermal fluid inside a sealed metal body. The fluid holds heat, so the unit keeps radiating warmth for 20-30 minutes after the thermostat cuts off. A convection heater pulls cool air from the bottom, passes it over a heating element, and pushes warm air out the top. No fan, no oil, just natural airflow.

How They Differ in Real Rooms

Heat distribution. Oil filled radiators are slower to warm up. A 1500W model takes about 15 minutes to feel warm in a 200 sq ft bedroom. But that heat is even, and it doesn't create a hot spot near the unit. Convection heaters warm up faster, but they rely on room air circulation. In a closed bedroom, you'll feel warmer near the unit and cooler across the room.

Running cost. Both are 100% efficient at converting electricity to heat. There's no energy efficient electric heater magic here. A 1500W unit running for 8 hours uses 12 kWh, whether it's oil filled or convection. The difference is in control. Oil filled radiators hold heat longer, so they cycle on and off less often. In a well-insulated room, that can cut running cost by 10-15% over a day. Convection heaters respond faster to a thermostat, which helps in drafty spaces.

Safety and surface temperature. This matters if your customers have kids or pets. Oil filled radiators have lower surface temperatures, usually 90-110°C on the fins. Convection heaters can hit 150°C on the grille. For a bedroom or nursery, oil filled is the safer bet. For a garage or workshop, surface temp is less of a concern.

What Buyers Actually Ask Us

We get the same question every month: "Which one should I stock for Amazon?"

Here's my blunt answer. If your customer is selling to homeowners who want a quiet, steady heat for a bedroom or living room, go with oil filled. It's the silent electric heater that people trust. No fan noise, no clicking. The thermostat clicks, but that's it.

If your customer is selling to people who need quick heat in a drafty office or a basement, go with convection. It's lighter, wall-mountable, and heats up in half the time. Convection panels are also easier to ship because they're flat and stack well. Oil filled radiators are heavy, around 12-15 kg for a 1500W unit, and they need more packaging.

There's also the oil filled radiator vs convection heater question for bathrooms. Both can be IP24 rated for bathroom installation, but convection panels are easier to wall mount and keep out of reach. Oil filled radiators on wheels take up floor space, which is a problem in a small bathroom.

Manufacturing and Sourcing Realities

We make both. Here's what you need to know before you place an order.

Oil filled radiators are more complex. The oil filling process needs precision, and the weld quality has to be perfect. Any leak is a return and a safety issue. Our standard MOQ is 200 pcs, but for oil filled, we often ask for 300 pcs because the production line setup is longer. Lead time is 30-45 days, depending on the wattage and whether you need a custom color or a digital thermostat.

Convection panels are simpler. They're sheet metal, a heating element, and a thermostat. MOQ stays at 200 pcs, and lead time is 15-25 days. If you're testing a new market, convection is the lower-risk first order.

Both can be CE and RoHS certified. If you're selling into the UK, we add UKCA. For Europe, ERP compliance is mandatory for energy labeling. We handle that paperwork, but you need to tell us the target country before we start tooling.

What to Choose for Your Market

Think about your customer's use case, not just the price point.

• Bedrooms and living rooms: Oil filled. Customers want quiet, even heat, and they're willing to wait 15 minutes.
• Offices and workshops: Convection. Quick heat, wall mountable, no oil to worry about.
• Bathrooms: Convection with IP24. Wall mounted, safe, fast.
• Garages and basements: Convection, but get a higher wattage, 2000W or 2500W. These spaces are less insulated, and oil filled won't keep up.

One more thing. Don't ignore the thermostat quality. A cheap bimetal thermostat drifts by 5-7°C. Your customer will complain that the room is too cold or too hot. We use a capillary thermostat on our oil filled units and a digital thermostat on convection panels with a wifi option. The wifi smart electric heater is a premium SKU, but it's worth offering because Amazon buyers search for it.

The Honest Takeaway

Oil filled radiators are the safer, more comfortable heat source for living spaces. Convection heaters are the faster, cheaper, more practical option for work spaces and small bathrooms. Don't try to be everything to everyone. Pick one as your core SKU, get the certifications right, and add the other as a secondary line once you have repeat orders. That's how you build a heater brand that survives the first winter of returns.

If you're still unsure, order a sample of each. Run them in your own office for a week. You'll feel the difference, and that's better than any spec sheet.