Oil Filled Radiator vs Convection Heater: What to Stock

You're sourcing heaters for a market that's split between two technologies, and the wrong bet leaves you with dead stock. I've watched buyers flip-flop for years, so let's settle it: oil filled radiator vs convection heater. Both work. They just work differently, and your customers' floors, ceilings, and electricity bills will tell you which one you should have bought.

The Core Difference: Heat Transfer, Not Heat Output

A convection heater pulls cold air in, runs it over a heating element, and pushes warm air out. It heats the air directly. An oil filled radiator heats oil inside a sealed metal fin, and that metal radiates heat into the room. The oil never burns, never needs replacing, and the surface stays hot for a long time after the unit shuts off.

That's the whole game. Convection is fast and direct. Radiant oil is slow and steady. For a distributor, that means two completely different customer profiles.

Where Convection Wins: Speed and Wall Mounts

Wall mounted electric heater models are almost always convection. Why? They're light, thin, and can be hung flush on a wall without stressing the bracket. That's what buyers searching for a "wall mounted electric heater" usually want for bedrooms or offices. They don't want a heavy metal slab on the wall.

Convection heaters also respond fast. Turn one on from a cold start, and you feel warm air within two to three minutes. That matters for a "best electric heater with thermostat" search, because the thermostat cycles the element on and off quickly, keeping the room within a tight band. No thermal lag. No overshoot.

Downside? The air gets drier. The fanless ones are quiet, but they still create natural airflow, which stirs dust. And once you turn it off, the room cools down almost immediately. No residual heat.

Where Oil Filled Radiators Win: Comfort and Residual Heat

Oil filled radiators are the workhorses for "energy efficient electric heater" searches, but not because they use less electricity. They don't. A 1500W convection heater and a 1500W oil radiator use the same power. The difference is perceived warmth and how long the heat stays.

An oil radiator's surface stays hot for 20 to 40 minutes after the thermostat clicks off. So the room doesn't swing between hot and cold. It just sits at a comfortable level. That's why people with kids or elderly family members prefer them. No hot metal exposed to little fingers? Actually, the surface does get hot, but it's lower than a glowing quartz element, and the fins are less dangerous.

They're also silent. No fan, no element ping. Just a gentle ticking as the oil expands. That's your "silent electric heater" crowd, usually for bedrooms or nurseries.

But they're heavy. A typical 2000W oil radiator weighs 15 to 18 kg. Shipping costs more. Wall mounting is rare, and you never see a good "electric heater for bathroom IP24" in oil form, because the weight and splash risk make it impractical.

Real Numbers for Your Catalog

Let me give you something you can actually use. In our factory, we make both. A 1500W convection panel, wall mounted, with a digital thermostat, runs about 2.1 kg and takes 15 days to produce at a 200 pcs MOQ. A 2000W oil filled radiator with 11 fins runs about 16.5 kg and takes 25 to 30 days at the same MOQ, mostly because the filling and leak testing process is slower.

CE and RoHS are standard on both. UKCA if you're shipping to the UK. ERP compliance matters for Europe, and that's where oil radiators get tricky, because their standby power and thermostat accuracy are scrutinized. We've had to redesign a thermostat housing to pass ERP on an oil model. Convection is easier to certify.

Running Cost: The Honest Answer

People search for "electric heater running cost" and "cheap to run electric heater" all the time. Here's the blunt truth: a 1500W heater costs the same to run per hour whether it's oil or convection. The difference is how long it runs. Oil radiators hold heat, so they cycle off more often in a well-insulated room. In a drafty garage, both run almost constantly, and you'll see no difference in your bill.

So if your customer is buying for a garage or workshop, don't sell them an oil radiator. Sell them a convection heater or, better yet, an infrared heater. Infrared heats objects and people, not air, so it feels warmer in a cold, drafty space at a lower wattage. That's a different product line, but it's worth mentioning because a buyer who asks for "electric heater for garage" often ends up returning a convection unit because it can't keep up.

What to Stock Based on Your Market

If your customers are Amazon sellers targeting bedroom and office use, stock convection panels. They're cheaper to ship, easier to install, and they fit the "wall mounted electric heater" and "best electric heater with thermostat" search terms. If your customers sell into northern European markets where homes are well insulated and people care about comfort, oil filled radiators move well, especially in the 2000W to 2500W range.

For private label, the decision is also about branding. Oil radiators look bulkier, but they feel more substantial to a customer who equates weight with quality. Convection panels look modern and sleek. I've seen both work. It depends on your price point.

One Honest Takeaway

Don't try to be everything to everyone. Pick one technology per season and stock deep. The buyers who fail are the ones who split their container between two types and end up with a half-empty warehouse. Oil for comfort, convection for speed. Know which one your customer needs before you order, and you'll be fine. We've been making both since 2009, and the market hasn't changed that much. It's just a matter of matching the right box to the right room.