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The best energy-efficient heaters in the UK can save you £100–£300 per year on your electricity bills.

👉 If you want the cheapest heater to run right now, go for an oil-filled radiator. It retains heat longer, meaning you use less electricity overall.

In this guide, we’ve compared the best heaters available in the UK based on real running costs (£/hour and £/month), efficiency, and performance.

💡 Want to reduce your heating costs even further? See our guide on cheapest way to heat a room UK.

💷 Real Running Costs of Electric Heaters in the UK (2026)

Electricity in the UK costs around £0.30 per kWh, which means:

• 1000W heater → ~£0.30 per hour
• 1500W heater → ~£0.45 per hour
• 2000W heater → ~£0.60 per hour

👉 Monthly Cost Estimate

• 2 hours/day → ~£36/month
• 4 hours/day → ~£72/month
• 6 hours/day → ~£108/month

👉 Want to reduce these costs? Read: how much electricity do heaters use UK .

🏆 Best Overall – De’Longhi Dragon Oil-Filled Radiator

If you want the most energy-efficient heater in the UK, this is the safest choice.

This oil-filled radiator retains heat even after being switched off, which reduces overall electricity usage compared to standard heaters.

• ✔ Power: 2000W
• ✔ Running cost: ~£0.60/hour
• ✔ Best for: long sessions, bedrooms, living rooms

👉 Compared to fan heaters, this model can save you money over time.

Check Latest Price on Amazon UK

🧠 How to Choose an Energy-Efficient Heater

Which heater is cheapest to run?

Oil-filled radiators are usually the cheapest option for long-term heating.

Are electric heaters expensive to run?

They can be, but choosing the right type and using timers can reduce costs significantly.

How to reduce heating bills?

Use insulation tools and smart plugs to avoid wasted electricity.

👉 See: electric heater vs oil radiator cost UK .

❓ FAQs

What heater uses the least electricity in the UK?

Low-wattage ceramic heaters and oil radiators are the most efficient.

How much does it cost to run a heater per hour?

Between £0.30 and £0.75 depending on wattage.

Are oil radiators cheaper to run?

Yes, because they retain heat longer.