Oil Filled Radiator vs Convection Heater: What to Source

If you're a distributor trying to decide between an oil filled radiator and a convection panel, stop guessing. I've watched buyers lose money on the wrong pick because they didn't match the heater to the room's actual use. Let's break it down with numbers you can use.

The Core Difference Is Heat Transfer

Oil filled radiators heat oil inside a sealed metal fin. That oil holds heat and radiates it slowly into the room. Convection heaters pull cool air in from the bottom, pass it over a heating element, and push warm air out the top. One heats the mass, the other heats the air directly.

That sounds simple, but it changes everything about how the heater feels and costs to run.

Oil Filled Radiators: Slow, Steady, Silent

Oil radiators are the tortoise. They take 15 to 20 minutes to fully warm up. But once they do, they keep radiating heat even after the thermostat cycles off. That means the room temperature stays more even, with fewer cold spots.

They're also silent. No fan, no element clicking. If you're sourcing for a bedroom or a nursery, this matters. A silent electric heater is what buyers search for when they're tired of fan noise at night.

Downside? They're heavier. A typical 2000W oil filled unit weighs around 14 to 16 kg. Shipping costs go up, and wall mounting isn't practical. They sit on the floor and take up space. Also, the surface gets hot, so you need to be careful with placement near furniture or kids.

Convection Panels: Fast, Light, Wall Mountable

Convection panels are the hare. They respond in under two minutes. You walk into a cold office, flip it on, and feel warmth almost immediately. That's why they're a common pick for workspaces and bathrooms where you don't want to wait.

They're light, often under 6 kg for a 1500W model. That makes them easy to wall mount, which clears floor space and keeps them away from curious pets or children. Many of our wall mounted electric heater units come with IP24 rating, meaning they're safe for bathroom zones. That's a real selling point for buyers looking for an electric heater for bathroom IP24.

But here's the catch: convection heaters lose heat as soon as they shut off. The air cools quickly. So if you're heating a room for hours, the thermostat will cycle more often, and the running cost can climb compared to an oil radiator holding residual heat.

Running Cost: What the Real Numbers Say

Let's talk about the phrase buyers type: "electric heater running cost." Here's a real comparison.

Take a 2000W oil filled radiator running 8 hours a day in a 20m² bedroom. It cycles on and off, so actual consumption is about 60% of max power. That's 9.6 kWh per day. At $0.15 per kWh, that's $1.44.

Now take a 2000W convection panel in the same room. It cycles more frequently because the air cools faster, so consumption is closer to 75% of max. That's 12 kWh per day, or $1.80. Over a month, that's roughly $10.80 more.

That's not a huge gap, but for a buyer sourcing for a hotel chain or apartment complex, it adds up. If the room is well insulated and you want steady heat, oil wins on cost. If you only need heat for 30 minutes at a time, convection wins because it doesn't waste energy heating oil you don't need.

What Buyers Actually Search For

When someone types "oil filled radiator vs convection heater" into Google, they're not looking for theory. They want to know which one to put in a product lineup. Here's my blunt take.

Oil filled radiators are the safer bet for general residential use. They're quiet, even, and cheaper to run over long periods. They're also easier to private label because the design hasn't changed much in 20 years. Tooling is mature, and failure rates are low.

Convection panels are better for specific niches: bathrooms, small offices, or anyone who wants wall mounted electric heater aesthetics. They're also easier to ship because they're flat and light. A 40-foot container can hold about 1,200 convection panels versus 800 oil radiators. That affects your landed cost per unit.

Sourcing Reality from a Factory Perspective

I've been making both for over a decade. Here's what you need to know before you place an order.

MOQ for oil filled radiators is usually higher because the filling line has setup costs. At Hearthcore, we ask for 200 pcs minimum, but that's for standard models. If you want a custom color or a different wattage, expect 500 pcs. Lead time is 30–45 days because the oil filling and leak testing take time.

Convection panels are faster to produce. Standard lead time is 15–25 days. Same MOQ of 200 pcs works for most designs. If you're in a hurry and need a quick private label electric heater, convection is your friend.

Both types can be made with CE, RoHS, and UKCA certifications. For the UK market, make sure your supplier has UKCA in hand, not just CE. I've seen shipments held up because the paperwork wasn't aligned.

Which One Should You Source?

If you're a generalist distributor serving residential customers, stock both. They solve different problems. But if you have to pick one, start with oil filled radiators. They have a longer shelf life in terms of consumer demand, and they're less likely to be returned because of noise complaints.

If your target is commercial spaces, gyms, or workshops, convection panels are lighter and cheaper to ship. But don't expect them to keep a garage warm after you turn them off. The heat is gone in minutes.

One more thing: pay attention to thermostat quality. A cheap thermostat makes both types cycle badly, causing temperature swings and higher running costs. Ask your supplier what brand of thermostat they use. If they can't tell you, that's a red flag.

Honest Takeaway

There's no universal "best" heater. Oil filled radiators are better for steady, silent, long-duration heating. Convection panels are better for fast, targeted, wall-mounted needs. Match the product to the room and the buyer's expectation. That's how you avoid returns and build a reputation for actually knowing your stuff.