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 matters more than the wattage sticker. I've been on the factory floor since 2009, and I've seen buyers lose money by picking the wrong one for their climate and customer base. Let's cut through the marketing.

The core difference: radiant vs. airflow

An oil filled radiator heats oil inside a sealed metal body. That oil holds heat, so the unit keeps radiating warmth after the thermostat cycles off. A convection heater pulls cold air in from the bottom, passes it over a heating element, and pushes warm air out the top. No oil, no thermal mass. The air warms fast, but the room cools just as fast when the unit shuts off.

For a 20 square meter bedroom, a 1500W oil filled radiator will feel more stable. The surface stays hot, so people sitting nearby feel the warmth directly. A convection heater of the same wattage will warm the air quicker, but the temperature swings more. That's physics, not opinion.

What your customers actually ask

Buyers searching for an "oil filled radiator vs convection heater" usually want to know two things: running cost and comfort. Let's be blunt. Neither technology is more energy efficient at the same wattage. A 1500W heater uses 1.5 kWh per hour, whether it's oil or convection. The difference is how long it runs. Oil filled units cycle on and off less frequently because the oil holds heat. That means in a well-insulated room, the oil unit might run 20% less over a 24-hour period. But in a drafty room, that advantage disappears.

If your target customer is in the UK or northern Europe, where rooms are small and insulation is decent, oil filled radiators win on comfort. If your customer is in a warmer climate where they only need spot heating for an hour in the morning, convection is cheaper to manufacture and ship.

Build quality and sourcing reality

As a factory that builds both, I can tell you the oil filled radiator is more expensive to produce. The steel body, the welding, the oil filling process, the pressure testing. All that adds cost. A convection panel is simpler: a metal or glass front, an aluminum fin element, a thermostat, and a wall mount. That's why convection panels are lighter, cheaper, and easier to ship. For Amazon sellers, lower freight cost per unit often beats the higher margin of an oil filled radiator.

But there's a catch. Oil filled radiators are heavier, and freight costs have gone up. A 1500W oil filled radiator weighs around 15 kg. A convection panel of the same wattage weighs 4 kg. If you're shipping a 40-foot container, you can fit roughly 800 convection panels versus 400 oil radiators. Your landed cost per unit changes dramatically. I've seen buyers run the numbers and switch to convection for this reason alone.

When to sell each type

Here's my honest take after 15 years. Sell oil filled radiators to distributors who serve cold, damp markets where customers leave the heater on for hours. Think garages, workshops, and basements. Those customers search for "electric heater for garage" and "electric heater for basement" and they expect a heavy, durable unit that doesn't blow dust around. Oil filled radiators are silent, no fan noise, and they don't dry out the air as much. That's a real selling point for bedrooms and nurseries.

Sell convection heaters to customers who want wall mounted units, quick heat, and low weight. They're ideal for "wall mounted electric heater" searches in modern apartments or offices. Convection panels are also easier to integrate with Wi-Fi smart controls. Our factory can add a Wi-Fi module to a convection panel for about $3 more in parts. On an oil filled radiator, you'd need to redesign the control box, and the cost is higher.

One more thing: IP ratings. If your customer searches "electric heater for bathroom IP24", you need a convection panel with an IP24 rating. Oil filled radiators are rarely IP24 because the surface temperature is high and the body isn't sealed against moisture. So for bathroom applications, convection is the only choice. We make a 500W and 1000W IP24 convection panel specifically for that. That's a niche that sells year-round, not just in winter.

Running cost and certifications

Buyers searching for "energy efficient electric heater" or "cheap to run electric heater" are often misled by marketing. There's no such thing as a cheap to run electric heater at the same wattage. What you can do is offer a heater with a good thermostat and a timer. A unit with a 0.5°C accuracy thermostat will cycle less than one with a 2°C swing. That's where the real savings come from. We fit a mechanical thermostat on our entry-level units and a digital one on the premium line. The digital one costs about $1.50 more in parts, but it reduces running cost by roughly 10% in a typical room. That's a selling point you can actually verify.

On certifications, don't skip. If you're selling into the UK, you need UKCA. Europe needs CE and ERP. RoHS is mandatory everywhere. We've been building to these standards since 2012, and we can provide test reports on request. But understand this: a CE certificate on a Chinese factory's website means nothing unless it's backed by a test lab. Ask for the test report and the lab name. If they hesitate, walk away.

MOQ, lead time, and private label

Most buyers come to us for private label. They want their logo on the front, their color, their packaging. Our standard MOQ is 200 pcs per model. That's low enough for a startup but high enough to keep the line running efficiently. Lead time is 15 to 45 days depending on the model and whether you need custom packaging. If you're in a rush for a winter launch, we can do 15 days on our standard convection panels, but you'll pay a small premium for the line change.

One piece of advice: don't order a single model in huge quantities before you test the market. Start with 200 to 500 units of two different types, one oil filled and one convection. Put them on Amazon or with a distributor, and see which one turns over faster. We've had buyers do exactly that, and the results were surprising. One buyer in Germany thought oil filled would win, but convection sold 3 to 1 because of the lower price point and lighter shipping.

The honest takeaway

There's no universal best. Oil filled radiators are better for long-duration heating in cold, drafty spaces. Convection panels are better for quick heat, wall mounting, bathrooms, and lower landed cost. Your job is to match the product to your customer's room size, climate, and budget. Don't let a marketing brochure decide for you. Run the numbers on freight, ask for test reports, and order small first. That's how you build a heater line that actually sells.