Oil Filled Radiator vs Convection Heater: What to Source

If you're a buyer trying to decide between oil filled radiators and convection panels, stop guessing. I've been building both since 2009, and the choice comes down to one thing: how the heat moves in the room.

Oil filled radiators heat oil inside a sealed metal body. That oil holds heat and radiates it outward. Convection heaters pull cold air in from the bottom, run it over a heating element, and push warm air out the top. Different physics, different buyer profile, different price point.

Oil Filled Radiator: The Slow, Steady Workhorse

Oil filled radiators are heavy. A typical 1500W unit weighs 12 to 15 kg. That weight is the point. The oil stores heat, so the surface stays warm for 20–30 minutes after the thermostat cuts power. That means fewer on-off cycles and steadier room temperature.

For your customers, that's a real benefit in bedrooms, nurseries, or anywhere people want quiet, even heat. There's no fan, so they're silent. No exposed element, so they're safer around furniture. And because the surface temperature is lower than a fan heater, they're less of a burn risk for kids or pets.

But they're slow. From cold, a 1500W oil radiator takes 20–25 minutes to feel warm. They're also bulky to ship. A 7-fin radiator is about 60 cm wide and 65 cm tall. Freight costs eat into margins fast if you're importing by sea.

Convection Heater: Fast, Light, and Wall Mountable

Convection panels are the opposite. A 2000W wall mounted electric heater weighs maybe 5 kg. It heats a 20 m² room in 5–10 minutes. The air comes out warm, not hot, so it feels less aggressive. And because they're wall mounted, they save floor space.

That's why they dominate the market for living rooms, offices, and any room where floor space is tight. They're also cheaper to produce and ship. A typical convection panel is 2–3 cm thick and can be flat-packed. You can fit 500 units in a 40-foot container versus maybe 200 oil radiators.

But they stop heating the moment you switch them off. No thermal mass. The room cools down faster. And if the unit is poorly built, the heating element can get hot enough to singe dust. That's why we use aluminum fins with a 1.5 mm gap for airflow, not just a bare wire.

The Real Comparison: Running Cost and Comfort

Buyers often ask about running cost. Here's the honest math: both types are nearly identical in efficiency. A 1500W heater uses 1.5 kWh per hour, whether it's oil or convection. The difference is how long it runs.

Oil radiators hold heat, so they cycle on and off less. In a well-insulated 15 m² bedroom, a 1500W oil unit might run 60% of the time, using 0.9 kWh per hour. A convection heater in the same room might run 70% of the time, using 1.05 kWh. That's about 15% more electricity. But the convection heater heats the room twice as fast. So for a home office where you only heat the room while working, convection wins. For a bedroom you heat all night, oil wins.

That's the honest takeaway: there's no universal best. It's about use case.

What Your Customers Actually Ask Us

Most of our B2B buyers come with one of two questions. First: "What's the cheapest to run?" Second: "Which one is safer for a bathroom?"

For the first, we tell them to look at thermostat quality, not heater type. A cheap mechanical thermostat swings 5°C before kicking in. That wastes energy. We use a capillary thermostat with a 1°C differential on our oil radiators. It costs us $1.20 more per unit, but it cuts running cost by up to 10% in real use. That's a selling point you can take to your retail customers.

For the second, neither oil nor convection is inherently bathroom-safe. You need IP24 rating. That means the unit is protected against splashing water from any direction. We make both types with IP24, but for bathrooms, we usually recommend the convection panel because it can be wall mounted high, away from direct splashes. Oil radiators are floor standing and more likely to get wet.

Sourcing Considerations for Private Label

If you're sourcing for your own brand, here's what to watch. Oil radiators have more parts: wheels, brackets, oil filling port, and a heavier steel body. That means more assembly steps and more quality control points. Our MOQ for oil radiators is 200 pcs, lead time 30–45 days. Convection panels are simpler, MOQ 200 pcs, lead time 15–25 days.

Certification is another difference. Both need CE and RoHS for Europe. But oil radiators are often sold with UKCA for the UK market, and we've seen some retailers ask for ERP compliance because the standby power has to be below 0.5W. Convection panels are easier to make ERP compliant because they have simpler electronics.

One thing I'll say bluntly: don't source oil radiators from a factory that doesn't do a 100% oil leak test. We fill each unit with oil, pressurize it to 1.5 bar, and hold it for 10 minutes. If it leaks, it's scrap. That's non-negotiable.

The Bottom Line for Your Catalog

Carry both. They serve different customers. If your market is Northern Europe, oil radiators sell well for bedrooms and continuous heating. If your market is Southern Europe or the US South, convection panels move faster because they're cheaper to ship and heat up quick.

And when a buyer asks you "oil filled radiator vs convection heater," give them the straight answer: oil for steady, overnight comfort; convection for fast, targeted heat. Then ask them where the customer will use it. That question alone will close more deals than any spec sheet.

We've been making both for 15 years. The technology hasn't changed much. What changes is matching the right box to the right room. That's the job. Do that, and your customers will come back for the next season's stock.