Oil Filled Radiator vs Convection Heater: What to Source

If you've been in the heating business for more than a season, you know the question is never "which heater is best?" It's "which heater is best for this customer's room, budget, and expectations?" I've spent 15 years on the factory floor at Hearthcore, and I can tell you the oil filled radiator vs convection heater debate is one we settle every single day with buyers. Both sell. Both get returned if you pick the wrong one for the application. Here's the honest breakdown.

How They Actually Heat

A convection heater pulls cool air in, runs it over a heating element, and pushes warm air out. It heats the air directly. An oil filled radiator heats a thermal fluid inside the fins. That fluid holds heat and radiates it into the room over time. The result: convection gives you fast warm-up, oil gives you steady heat that lingers after the thermostat clicks off.

If your customer wants to feel warmth in five minutes, convection wins. If they want a room that stays warm without the heater cycling on and off every few minutes, oil filled wins.

Room Size and Heating Pattern

For a large room, say 20 square meters or more, a convection heater with a fan can push warm air farther. We make a 2000W wall mounted convection panel that handles that size fine. But it heats the air, not the objects. The moment you open a door, that heat is gone.

Oil filled radiators are better for rooms where people sit still, like bedrooms or offices. They heat the walls and furniture, so the room feels warmer at the same thermostat setting. That's why you see them in basements and garages where drafts are common. The radiant heat isn't blown away as easily.

Running Cost and Efficiency

Here's a number to keep in mind: both types are roughly 100% efficient at converting electricity to heat. No magic. The difference is how long the heater runs. An oil filled radiator with a good thermostat will cycle less because the oil holds heat. That means lower running cost over an evening, even though the wattage is the same.

For example, our 1500W oil filled radiator with a digital thermostat might run 20% less than a 1500W convection heater in the same room, simply because it doesn't need to reheat the air every time the temperature dips. That's real money over a winter. If a customer asks for an energy efficient electric heater, oil filled is often the safer answer.

Safety and Comfort

Oil filled radiators have a lower surface temperature, usually under 60°C on the fins. That matters for homes with kids or pets. Convection heaters with exposed elements get hotter. We put tip-over switches and overheat protection on both, but the oil filled unit is inherently safer to touch.

Noise is another factor. Convection heaters without a fan are silent. With a fan, you get a low hum. Oil filled radiators make no noise at all, just the occasional click of the thermostat. If a buyer asks for a silent electric heater, oil filled is the obvious choice.

What Buyers Actually Ask Us

Most of our B2B clients come to us with a specific channel in mind. Amazon sellers want products that don't get returned. Retail buyers want a range that covers price points. Private label brands want something they can differentiate.

For Amazon, oil filled radiators tend to have better reviews because they're quiet and comfortable. Convection panels are cheaper to ship and easier to mount on a wall, which saves warehouse space. If your customer is a distributor selling to hotels, they'll likely want oil filled for guest rooms. If they're selling to workshops or greenhouses, convection with a fan moves more air.

We also get a lot of questions about bathroom use. Neither type is IP24 rated by default. You need a dedicated bathroom heater for that. Our wall mounted convection panels can be built with IP24, but the standard oil filled radiator is not for wet zones. Don't let your customer make that mistake.

MOQ, Lead Time, and Certifications

We manufacture both types in-house. Standard MOQ is 200 pieces per model, which is manageable for a first test order. Lead time is 30–45 days depending on the configuration and whether you need custom branding. We have CE, RoHS, and UKCA certs on the main models. ERP is available on the smart thermostat versions.

One thing I'll tell you straight: don't source oil filled radiators from a factory that only makes convection heaters. The filling process, welding, and oil quality are completely different. We've been doing both since 2009, and we still have to be careful with the oil seal. A leaky unit is a return and a refund, and it kills your brand.

How to Choose for Your Market

Start with the room. For bedrooms, offices, and any space where people sit still, oil filled. For living rooms, open plans, and large rooms, convection with a fan. If your customer can't decide, ask about the floor. Carpet or wood? Oil filled is heavier, so it's fine on the floor. Convection panels can be wall mounted, which saves floor space.

Also think about shipping. Oil filled radiators weigh more, so freight costs are higher. A 1500W oil filled unit weighs around 12 kg. A 1500W convection panel is maybe 4 kg. That difference hits your landed cost. If you're selling on Amazon, that's a big deal.

The Honest Takeaway

There is no universal "best." There is only the right match for the room and the customer. Oil filled radiators are the safer, quieter, more comfortable choice for most homes. Convection heaters are lighter, cheaper to ship, and better for large or drafty spaces.

If you're sourcing for a new line, test both. Order the 200-piece MOQ, put them in different rooms, and track the returns. That data is worth more than any spec sheet. We'll help you get the right unit for your market, but the decision has to come from your customers' habits, not a marketing trend.