If you are heating a room without gas, or topping up where the central heating does not reach, the choice usually comes down to two options. Electric panel heaters and oil-filled radiators are the most popular electric heaters in Irish homes, and both do the same core job, they turn electricity into heat. The question is not which one is more efficient, because on that measure they are identical. The real question is how each one delivers and holds that heat, and which suits your room, your routine and your budget.
This guide compares electric panel heaters vs oil-filled radiators for Irish homes across the things that actually matter: how fast they warm a room, how long they stay warm, what they cost to run, the rooms each suits best, and the controls that save you money. By the end you will know which type to buy.
Quick answer: panel heater or oil-filled radiator?
Choose an electric panel heater when you want fast, on demand heat and smart control, for example a home office, a bathroom or a room you heat in short bursts. Choose an oil-filled radiator when you want steady background warmth that lingers after the heater switches off, for example a sitting room or a bedroom used for longer spells. Both cost the same to run for the same heat output, so match the heater to how you use the room.
How each one works
Electric panel heaters
A panel heater is a slim, wall mounted or freestanding unit that warms the air by convection. An element heats the air inside the panel, that warm air rises and circulates around the room, and cooler air is drawn in at the base. Because there is very little mass to heat up, a panel heater reaches temperature quickly and cools quickly once it is off. Modern models like the Titan Electric Panel Heater with WiFi Control add a digital thermostat and app scheduling, which is where the real savings come from.
Oil-filled radiators
An oil-filled radiator heats a sealed reservoir of oil inside the body, and that warm oil then radiates heat gently from the fins. The oil is never topped up or replaced, it simply acts as a heat store. This thermal mass takes longer to warm up, but it holds heat and keeps releasing it for a while after the radiator switches off. The Titan 2 kW Oil-Filled Radiator is a typical example, with multiple heat settings, a thermostat and castor wheels so you can move it between rooms.
Speed of heat
Panel heaters win on speed. With little mass to warm, they take the chill off a room within a few minutes, which makes them ideal where you want heat the moment you walk in. An oil-filled radiator is slower to get going because it has to warm the oil first, so it is less suited to a quick blast of heat and better where you plan ahead.
Heat retention
Oil-filled radiators win on retention. Once the oil is warm it keeps radiating heat for a while after the power cuts off, so the room stays comfortable a little longer. A panel heater cools almost as fast as it heats, so the warmth drops away soon after it switches off. Neither is better in the abstract, it depends on whether you want heat that arrives fast or heat that lingers.
What do they cost to run in Ireland?
This is where a lot of buyers are misled, so here is the honest position. Every electric heater is essentially 100 percent efficient, which means a 2kW panel heater and a 2kW oil-filled radiator both turn one unit of electricity into the same amount of heat. For the same wattage and the same running time, they cost exactly the same to run.
Using a typical Irish electricity rate of around €0.35 to €0.40 per unit in 2026, here is roughly what one hour at full power costs:
- A 1000W, or 1kW, heater: about €0.35 to €0.40 per hour
- A 1500W heater: about €0.53 to €0.60 per hour
- A 2000W, or 2kW, heater: about €0.70 to €0.80 per hour
Check your own unit rate, as it varies by supplier and tariff. The savings do not come from the type of heater, they come from control. A thermostat that holds the room at the right temperature, and a timer that only heats when you are there, will cut your bill far more than choosing one type over the other. This is the single most important point in the whole comparison.
Which rooms suit each type?
- Home office or study: a panel heater, for fast heat during working hours on a schedule.
- Bathroom: a panel heater rated for the room, for quick warmth before and after a shower. Always choose a model with the correct rating for a bathroom.
- Sitting room: an oil-filled radiator, for steady background warmth across an evening.
- Bedroom: either works. An oil-filled radiator gives gentle warmth that lingers, while a quiet panel heater on a schedule warms the room before you wake.
- Conservatory or extension: size up either type, as these rooms lose heat quickly.
Controls and smart features
Controls matter more than the heater type, because they decide how much energy you waste. Look for a digital thermostat that holds the room within about one degree of your target, a seven day timer so you can set different schedules for weekdays and weekends, and open window detection that pauses heating if the temperature suddenly drops. WiFi and app control let you adjust the heat from your phone, which is handy if your schedule is unpredictable. Smart features are more common on panel heaters, so if app control matters to you that may tip the decision.
Common mistakes to avoid
- Buying on wattage alone without matching it to the room size. Too small and it runs flat out, too large and it short cycles.
- Believing one type is cheaper to run than the other. For the same output they cost the same, control is what saves money.
- Skipping the timer and thermostat. A basic dial heater left on all evening is the most expensive way to heat a room.
- Using a standard heater in a bathroom. Only use a model rated for the room.
- Choosing a panel heater for a room you want warm for hours, or an oil-filled radiator for a quick blast. Match the heater to how you use the space.
Which should you choose?
If you want heat fast, want smart scheduling, and heat rooms in short bursts, choose an electric panel heater. If you want steady, lingering warmth in a room you occupy for longer spells, choose an oil-filled radiator. If you are still unsure, a WiFi panel heater is the more flexible everyday choice for most Irish homes, because the scheduling and thermostat do the hard work of keeping costs down. Whichever you pick, buying the right wattage for the room and using the controls properly matters more than the type.
Frequently asked questions
Do panel heaters or oil-filled radiators heat a room faster?
Panel heaters heat faster. They warm the air by convection and have very little mass to heat, so they take the chill off within a few minutes. An oil-filled radiator has to warm its internal oil first, so it is slower to reach temperature but holds heat for longer afterwards.
Which is cheaper to run in Ireland, a panel heater or an oil-filled radiator?
For the same wattage and running time they cost the same, because both are essentially 100 percent efficient and turn one unit of electricity into the same amount of heat. Your running cost is decided by the wattage, the hours used and your electricity rate, not by the type of heater. Good thermostats and timers are what actually cut the bill.
Which type holds heat longer after it switches off?
The oil-filled radiator. Its warm oil keeps radiating heat for a while after the power cuts off, so the room stays comfortable a little longer. A panel heater cools soon after it switches off.
Are electric panel heaters or oil-filled radiators better for a bedroom?
Both work well in a bedroom. An oil-filled radiator gives gentle, lingering warmth, while a quiet panel heater on a timer can warm the room before you wake and switch off automatically. Choose a model with a child lock and quiet operation for bedrooms.
Can I control either type from my phone?
Yes, if you choose a smart model. WiFi and app control are more common on panel heaters, such as the Titan WiFi panel heater, which lets you set schedules and adjust the temperature from your phone. Many oil-filled radiators use a simpler dial or digital thermostat instead.
Do I need an electrician to install one?
Not for plug in models, which simply use a standard socket. If you want a heater hardwired to a fused spur for a permanent, tidy installation, or you are fitting one in a bathroom, use a registered electrician and have the work certified.
Shop electric radiators and heaters, free delivery across Ireland
Browse the full range of electric radiators and heaters at Shamrock Electrical, including the Titan WiFi panel heater and the Titan oil-filled radiator, all in stock and delivered free across Ireland. Need help choosing the right size for your room? Our team is happy to advise.