Oil Filled Radiator vs Convection Heater: What to Source

You've got a buyer asking for heaters, and you're staring at two very similar product pages. One says oil filled radiator, the other says convection panel. Both plug into the wall, both heat a room, but they are not the same product. If you source the wrong one for your market, you'll eat the returns.

I've been building these since 2009, and I still see distributors mix them up. Let me break down the real differences, not the marketing copy.

How Each One Actually Heats

An oil filled radiator heats oil inside a sealed metal fin. The oil holds heat, the metal gets hot, and the heat radiates outward. It also creates a gentle convection current as air passes over the hot fins. That's why it feels like a solid, heavy, slow-to-warm unit.

A convection heater has no oil. It's a metal panel or a finned element that heats air directly. Cold air enters at the bottom, passes over the hot element, and rises out the top. The room warms through air circulation, not radiant heat from the unit.

That difference drives everything else: weight, price, heat feel, and running cost.

Heat Feel and Comfort

Oil filled radiators give you a deep, even heat. The surface temperature is lower than a convection element, so it doesn't scorch the air or dry it out as fast. In a bedroom, that matters. People complain about dry throats with convection heaters. Oil filled radiators are the usual answer for a silent electric heater with thermostat, because the thermostat cycles the oil heating, not a loud fan.

Convection heaters respond faster. You walk into a cold room, turn it on, and feel warm air within five minutes. But that heat is more directional and can feel drafty near the unit. For a workshop or garage, that's fine. You want quick warmth, not a cozy blanket.

If your buyer is targeting bedrooms, oil filled wins. If they're targeting offices or workshops, convection is often the better call.

Running Cost and Efficiency

Here's the blunt truth: both are nearly 100% efficient at converting electricity to heat. That's physics. The real difference is how they hold and distribute that heat.

Oil filled radiators keep heating after the thermostat cuts off. The oil is hot, so it continues to radiate into the room. That means the element cycles on less often. In a well-insulated room, that can cut your electric heater running cost by 10-15% compared to a convection unit that cools down instantly.

But convection heaters are cheaper to build and lighter to ship. A 1500W convection panel might weigh 5 kg. A 1500W oil filled radiator weighs 15 kg. Shipping cost per unit is higher for oil filled. That eats into your margin.

For a private label brand, you need to know your target price point. If you're competing on price, convection is the way. If you're competing on comfort and long-term running cost, oil filled gives you a story to sell.

Space and Mounting

Convection heaters can be wall mounted. That's a huge selling point for small apartments or rooms with limited floor space. A wall mounted electric heater frees up floor area and looks clean. Oil filled radiators are almost always floor standing with castors. You can't mount a 15 kg oil-filled unit on a drywall wall without serious reinforcement.

So if your buyer is selling into markets with tiny rental apartments, wall mounted convection panels are the obvious choice. They're also easier to install, which reduces customer support calls.

Oil filled radiators are better for larger rooms where floor space isn't an issue, like a living room or a big bedroom. They have a larger surface area, so they can push more heat into a large room without running the element at max all day.

Maintenance and Safety

Oil filled radiators are sealed. No oil changes, no leaks if built properly. We test every unit for pressure before shipping. But if a unit does leak, it's a messy return.

Convection heaters have no fluid, so no leak risk. They're also lighter to handle. Safety-wise, both can meet CE and RoHS. For bathroom use, you need IP24 rating on either type. We do IP24 on our convection panels as standard. Oil filled radiators usually have IP24 too, but check the spec sheet.

One thing to watch: convection heaters get hotter on the surface. That's a burn risk for kids or pets. Oil filled radiators run cooler on the surface, which is why they're often preferred in bedrooms or family rooms.

Real Comparison Numbers

Let me give you a real example from our line. Our 1500W oil filled radiator has 7 fins, surface temp around 85°C, and weighs 14.8 kg. Our 1500W convection panel is 5.2 kg, surface temp around 110°C, and can be wall mounted. Both are CE and RoHS certified. Lead time is 30 days for a 200-piece MOQ. The oil filled unit costs about 35% more in materials and freight.

Which one do you source? Depends on your market.

If you're selling to Amazon in Germany or the UK, oil filled radiators sell well because buyers associate them with quality and comfort. If you're selling to a hardware chain for garage use, convection panels move faster because they're cheaper and easier to install.

How to Choose Electric Heater for Your Line

Here's a simple framework I give every buyer who asks how to choose electric heater:

• Room size: under 15 sqm, convection is fine. Over 15 sqm, oil filled gives better heat distribution.
• Use case: bedrooms and living areas get oil filled. Workshops, offices, and garages get convection.
• Budget: if your landed cost needs to be under $25, convection. If you have room for $35+, oil filled.
• Shipping weight: if you're air shipping samples, convection is cheaper. Sea freight, weight matters less.

Also consider the oil filled radiator vs convection heater debate from a marketing angle. Oil filled has a premium feel. You can charge more. Convection is a commodity; you'll compete on price.

The Honest Takeaway

If you're building a private label brand and want to minimize returns, start with oil filled radiators for home use. They're forgiving, comfortable, and buyers understand them. Use convection panels for commercial or utility spaces where speed and price matter more. Don't try to sell one type for both. You'll end up with a mediocre product and a confused customer.

And if you're sourcing from China, ask the factory for their real test data on heat-up time and surface temperature. Any factory that's been around since 2009 should have that on hand. If they don't, walk away.