Oil Filled Radiator vs Convection Heater: What to Source

If you're sourcing electric heaters for a European or North American market, the first question you'll get from a buyer is usually the same: oil filled radiator vs convection heater, which one do I stock?

I've been building both since 2009, and the honest answer is: it depends on the room, the user's patience, and their electricity bill. Let's break it down without the marketing gloss.

How Each One Actually Heats

An oil filled radiator heats a sealed metal fin filled with thermal oil. The element warms the oil, the oil warms the metal, and the metal radiates heat into the room. It's slow to start, but it keeps throwing heat after the thermostat clicks off.

A convection heater pulls cold air from the bottom, passes it over a heating element, and pushes warm air out the top. It's a direct, fast, and dry heat. No fan, no noise, just natural airflow.

That's the core difference. One stores heat, the other moves it.

Where Each One Wins

For a bedroom or a home office, most people want silence and steady warmth. An oil filled radiator is the better bet. The surface temperature stays lower, so it's safer if someone brushes against it. It also doesn't dry the air as aggressively as a convection unit. If your buyer is asking for a silent electric heater, oil filled is the answer.

For a living room or an open-plan space, convection heaters respond faster. You walk in cold, turn it on, and feel warmth within a few minutes. They're also lighter and easier to wall mount. If the buyer's customer wants a wall mounted electric heater that doesn't take floor space, convection is the way.

Here's a real comparison number: a 1500W oil filled radiator takes about 20 minutes to reach full surface temperature. A 1500W convection heater blows warm air within 90 seconds. But the oil filled unit will keep the room warm for 15–20 minutes after it shuts off. The convection heater stops warming the moment it powers down.

Running Cost and Efficiency

Both are 100% efficient at converting electricity to heat. There's no magic. The difference is in how they feel, not in the wattage. A low wattage electric heater that runs longer can cost more than a higher wattage one that cycles off faster.

For a garage or workshop, I'd source convection. Those spaces are drafty and you need quick heat. An oil filled radiator will struggle to keep up with cold air leaking in. For a basement that's already insulated, oil filled works fine because the heat lingers.

Buyers often ask about the electric heater running cost. The math is simple: 1500W for one hour is 1.5 kWh. Multiply that by the local rate. That's it. Neither type is cheaper to run at the same wattage. What matters is how long the thermostat keeps it on.

Thermostats and Controls

A best electric heater with thermostat is not a luxury, it's a requirement for any serious market. Both types can take a mechanical dial or a digital thermostat. Digital is more accurate, but mechanical is cheaper and more robust for rough handling in shipping.

If you're targeting the smart home crowd, a wifi smart electric heater is a differentiator. We wire those with a standard 2.4GHz module. It's not complicated, but it adds about 15 days to lead time because of the certification process for wireless modules. Standard units are 15–30 days. Smart units run 30–45 days.

Safety and Certifications

For bathroom use, you need IP24. That means the unit is protected against splashing water from any direction. Both oil filled and convection can be built to IP24, but convection heaters are easier to seal because they have fewer seams. If your buyer wants an electric heater for bathroom IP24, recommend a convection panel with a sealed bottom.

Every unit we ship to Europe carries CE and RoHS. For the UK, add UKCA. If you're selling into Germany or Austria, you'll want ERP compliance for standby power. We've done all of these. Don't skip them. A CE certified electric heater supplier isn't hard to find, but one that actually tests and holds the paperwork is rarer.

What to Stock as a Distributor

If you're an Amazon seller, start with convection panels. They're flat, easy to package, and cheaper to ship. The box is thin, so freight costs are lower. They also sell well year-round because they're light and easy to mount.

If you're targeting the premium end or the older demographic, oil filled radiators are a safer bet. They feel more substantial and people trust them for overnight use in bedrooms. The downside is weight. A 2000W oil filled radiator weighs about 15 kilos. Shipping that from China to a warehouse in the US adds real cost.

For a private label brand, I'd suggest offering both. Use the same thermostat, same cord, same color scheme. That way you only stock one spare part kit, and the branding stays consistent. We've done that for several brands. It works.

MOQ and Lead Times

Our standard MOQ is 200 pieces per model. That's not a hard rule, but it keeps the price sane. Below that, the per-unit cost jumps because we have to change over the line for a small run. For a mixed container, we can do 200 of each model, but not 50 of five models. It's just not efficient.

Lead times are 15 days for a standard in-stock model, 30 days for a custom color or logo, and 45 days if you need a new wattage or a different thermostat. Plan your season early. October orders are too late for December sales.

The Honest Takeaway

Oil filled radiators are for people who hate noise and want steady heat. Convection heaters are for people who want fast warmth and don't mind a slightly drier air. Don't try to make one do the other's job. If you're sourcing for a cold market, stock both. If you're just testing the water, start with convection and add oil filled once you see repeat orders.

That's the reality from the factory floor.