Oil Filled Radiator vs Convection Heater: What to Source for Your Market

You've probably had this conversation with a buyer at 2 AM their time, 2 PM yours. They're staring at two product pages, one for an oil filled radiator, one for a wall mounted convection panel, and they ask: which one should I stock? The honest answer is it depends on where their customers live, how they heat, and what they're willing to pay for shipping. Let's break it down without the marketing gloss.

The core difference: heat transfer, not just looks

An oil filled radiator heats oil inside a sealed metal fin. That oil holds heat, then radiates it out slowly. A convection heater pulls cold air in from the bottom, runs it over a heating element, and pushes warm air out the top. No oil, no thermal mass. That's the whole game.

So what does that mean in practice? The oil filled radiator keeps warming a room after the thermostat clicks off. The convection heater stops the moment you cut power. That's why oil filled units feel more "cozy" in a bedroom, and why convection panels are the go-to for a wall mounted electric heater in a hallway or office where you want quick response.

Running cost and efficiency: be careful with the word "efficient"

Here's the thing buyers get wrong. Both types are nearly 100% efficient at converting electricity to heat. A 1500W oil radiator and a 1500W convection panel put out the same amount of heat energy. The difference is how that heat is delivered and how long it stays in the room.

If your customer wants an energy efficient electric heater that feels cheap to run, the convection panel wins on short bursts. Heat a room for 20 minutes, turn it off, done. The oil radiator keeps radiating for another 30-40 minutes after shutdown, which is great for overnight use but wasteful if you're only in the room for a short time.

For a low wattage electric heater, say 500-700W, convection is usually the better bet. That low wattage oil filled unit takes forever to get up to temperature. We make both, and I'll tell you straight: a 600W oil radiator is for very small, well-insulated spaces only. A 600W convection panel can actually do something useful in a bedroom or small office.

Weight, shipping, and installation

This is where procurement managers start paying attention. A typical 1500W oil filled radiator weighs 12-15 kg. A convection panel of the same wattage weighs 3-4 kg. Shipping cost difference is real. If you're importing 500 units by sea, that's several tons of extra weight and volume. Your freight quote will look very different.

Installation matters too. Oil filled radiators sit on casters, take up floor space, and need to be moved around. Convection panels mount on a wall, which is why buyers searching for wall mounted electric heater options are almost always looking at convection. But that means you need to source mounting brackets, and your customer needs to be comfortable drilling holes. For apartment dwellers, that's a dealbreaker sometimes. So you end up stocking both.

Comfort and noise: what the end user actually feels

Oil filled radiators are silent. No fan, no moving parts. Just the occasional tick of metal expanding as it heats. That makes them a strong candidate for the silent electric heater with thermostat category, especially for bedrooms. Convection heaters are also silent in terms of fan noise, because most don't have fans. But they do create a slight air current, which some people feel as a draft. It's not loud, but it's there.

Infrared heaters are a different animal entirely, and if your buyer asks about infrared heater vs convection, the answer is about directional heat. Infrared warms objects and people, not the air. Convection warms the air. For a whole room, convection wins. For a person sitting in a cold workshop, infrared wins. We make both, so I don't have a horse in that race.

Thermostat and control: what buyers expect now

Nobody wants to manually turn a knob anymore. For both types, we fit mechanical or digital thermostats. The digital ones hold temperature within about ±1°C. If you're selling on Amazon, you need that. But if you're selling to a distributor who supplies hardware stores, a simple mechanical thermostat is more reliable and cheaper to repair. Don't over-spec your control system unless your buyer is asking for wifi smart electric heater features. That adds cost and returns risk.

For wifi models, we use a standard 2.4GHz module, and the app works with Alexa and Google Home. But here's a real detail: the wifi module adds about $3-4 to the BOM cost, and it increases the failure rate by about 2% based on our field returns. If your buyer's market is older customers, skip it. If they're selling to tech-savvy homeowners, it's a differentiator.

Safety and certifications: non-negotiable

Both types need overheat protection and a tip-over switch if they're floor standing. For bathroom use, you need IP24 rating, which means splash-proof. We do that on both, but convection panels are easier to seal properly. An oil filled radiator has seams and joints that are harder to make fully splash-proof. So if your buyer wants an electric heater for bathroom IP24, recommend a convection panel or a specifically designed bathroom unit, not a standard oil radiator.

All our units carry CE and RoHS. For the UK market, we add UKCA. For ERP compliance, we test to the latest directives. If your buyer asks for a CE certified electric heater supplier, we can send the test reports same day. Don't accept a supplier who can't show you the actual test lab name. We use SGS and TÜV. That's not a brag, it's just what you need to avoid getting your shipment held at customs.

MOQ, lead time, and a real comparison number

Our standard MOQ is 200 pieces per model, mixed colors allowed. Lead time is 15-45 days depending on whether you need custom branding, packaging, or a modified wattage. For a standard 1500W oil filled radiator with digital thermostat, we produce about 5,000 units a month. For a 2000W convection panel, about 8,000.

One number that might help you sell to your buyer: a 1500W heater running 8 hours a day at $0.15/kWh costs $1.80 per day. That's the same for both types. The difference is that the oil radiator will keep the room warm for another hour after it shuts off, so in a well-insulated bedroom, you could run it 7 hours instead of 8. That's a 12% saving. Not huge, but it adds up over a winter. If your customer is comparing electric heater vs gas, gas is usually cheaper per BTU, but it costs more to install and maintain. Electric wins on simplicity and safety.

How to choose electric heater for your market: a practical rule

If your market has cold winters and people heat a single room for long hours, stock oil filled radiators. If your market has mild winters and people want quick heat in a home office or garage, stock convection panels. If your buyers are asking for an electric heater for large room, go with a 2000-2500W convection or a 2500W oil radiator, but check the voltage. US market is 120V, so max wattage is around 1500W on a standard outlet. Europe is 230V, so you can go higher.

For an electric heater for garage or workshop, neither type is ideal if the space is drafty. You need a fan heater or an infrared unit. We make industrial fan heaters up to 5000W for that. But that's a different conversation.

The honest takeaway

Don't try to be the cheapest. Try to be the most specific. A buyer who stocks only oil filled radiators will miss the wall-mounted market. A buyer who stocks only convection will miss the bedroom crowd. If you're a private label brand, start with one model in each category, see what sells, then double down. We can do mixed containers, so you're not stuck with 500 units of one thing. That's how we've kept customers for over a decade. Not by being clever, but by being flexible and honest about what each product does and doesn't do.