Oil Filled Radiator vs Convection Heater: What to Source

You’ve got a buyer asking for wall-mounted panels one week, then oil-filled radiators the next. They want to know which one sells better, which one costs less to run, and which one they should put their private label on. The honest answer is: it depends on the room, the install, and the customer’s expectations. If you’re sourcing for a Western market, you need to know the difference beyond the marketing copy.

The core difference is heat transfer

A convection heater (like our wall-mounted panels) warms the air directly. Air passes over a heating element, rises, and circulates. An oil-filled radiator heats a thermal fluid inside a sealed metal body. That fluid holds heat and radiates it out slowly, plus it creates some convection as the air around it warms.

That one design difference drives everything else: warm-up time, heat retention, surface temperature, weight, and mounting options.

Warm-up and control

Convection panels are fast. A 1500W wall-mounted unit will start throwing warm air within two to three minutes. The surface gets hot quickly, so you feel it right away. That’s great for a bedroom or office where someone wants heat now, not in twenty minutes.

Oil-filled radiators are slow. A typical 1500W oil radiator takes 15 to 20 minutes to reach operating temperature. But once it’s hot, it keeps radiating heat after the thermostat cycles off. That means the room stays comfortable longer without the element kicking in as often.

If your customer is comparing oil filled radiator vs convection heater for steady background heat in a living room, the oil unit often wins on comfort. If they need fast heat in a workshop or drafty room, convection is the better call.

Energy efficiency: the real story

Both types convert essentially 100% of the electricity into heat. There is no efficiency winner at the element level. The difference is in how the heat is used.

Convection heaters heat the air. That air rises to the ceiling. In a room with poor insulation, you lose that heat fast. Oil-filled radiators heat the object itself, and the air around it. The radiant component warms people and furniture directly, which feels warmer at the same thermostat setting.

In practice, that means an oil-filled radiator can run at a lower thermostat setting and still feel comfortable. Over a full winter, that can cut running cost by 10-15% in a well-sealed room. But in a drafty garage or a warehouse, convection heaters are simpler and cheaper to run because you’re not paying to heat a heavy metal body that’s constantly losing heat to cold walls.

If the buyer asks about an energy efficient electric heater for a bedroom, oil-filled is the safer recommendation. For a workshop or garage, convection wins.

Safety and surface temperature

Oil-filled radiators have a big advantage here. The surface temperature typically stays between 60-80°C on a 1500W unit. That’s hot to the touch, but it won’t instantly burn skin like a convection panel’s exposed element or a high-temp infrared quartz tube. That makes oil radiators the default choice for homes with kids, elderly people, or pets.

Convection panels, especially wall-mounted ones, can be mounted high enough to avoid accidental contact. But if they’re placed at floor level, the surface can hit 100°C or more. That’s a safety concern, and it’s why we always recommend a certified unit with overheat protection and a thermal cutout.

For bathroom use, you need IP24 rating regardless of type. We make both oil-filled and convection units with IP24. Just remember: oil-filled radiators are heavy. Mounting one on a wall is a two-person job. Convection panels are light, typically 5-8 kg for a 1500W unit, and can go on a single bracket.

Installation and space

Convection panels are the obvious choice for wall mounted electric heater applications. They’re slim, flat, and take up zero floor space. Most of our panels are under 8 cm deep. That’s a huge selling point for small apartments or offices where floor space is precious.

Oil-filled radiators are portable. They sit on castors, plug into a standard outlet, and can be moved from room to room. That flexibility is why they still dominate the UK and EU retail market. But they’re bulky. A 2000W model is about 60 cm wide, 25 cm deep, and weighs over 15 kg. Shipping costs are higher, and storage takes more warehouse space.

If your customer is a private label brand selling on Amazon, think about that. A convection panel ships flat in a smaller box. An oil radiator needs a bigger, heavier box, and the shipping cost eats into margin.

What we actually build

At Hearthcore, we’ve been making both since 2009. Our oil-filled radiators go out with CE, RoHS, and UKCA certs. MOQ is 200 pcs, lead time is 35-45 days for a standard 1500W or 2000W model. Convection panels are faster to produce, usually 15-25 days, because they’re simpler to assemble. Both are available with mechanical thermostats or wifi smart electric heater controls.

One honest note: if a buyer asks for a 12v electric heater for an RV campervan, that’s not our line. You need a low-voltage DC unit, and the wattage is limited to about 400W. Neither an oil radiator nor a convection panel will run off 12V. Don’t waste time looking for one.

The takeaway

Sell convection panels for fast heat, wall mounting, and low shipping weight. Sell oil-filled radiators for steady comfort, safety, and lower running cost in sealed rooms. If your customer can’t decide, ask them one question: is the heater going to be fixed in one spot or moved around? That usually settles it.

And if you’re sourcing from China, get samples of both before you commit. Run them in your own office for a week. You’ll feel the difference, and you’ll be able to explain it to your buyers without guessing.