What Are Dual Fuel Radiators and How Do They Work?

Estimated reading time: 6 minutes

Dual fuel radiators are radiators that connect to both your central heating system and the mains electricity supply. They use an electric heating element fitted inside the radiator to provide independent heat when the boiler is off. This makes them one of the most practical heating solutions for rooms that need warmth all year round, not just in winter.  

Are Dual Fuel Radiators Better Than Standard Central Heating Radiators?

The answer is: it depends on what you need from them. A standard central heating radiator only works when the boiler is running. That’s fine for winter. But what about a damp bathroom in June? Or a chilly kitchen on a mild autumn morning when heating the whole house feels like overkill?

A dual fuel radiator solves that problem. In winter, it runs off your central heating like every other radiator in the house. In summer, you switch to electric mode. A small element heats the water trapped inside that single radiator. Just that one unit. No boiler needed.

So if you have rooms that need occasional warmth outside of the heating season, dual fuel gives you something a standard radiator simply can’t: year-round flexibility.

For rooms heated only in winter, a standard central heating radiator does the job perfectly well. There’s no need to add dual fuel capability to every radiator in the house.

How Does a Dual Fuel Radiator Switch Between Modes?

The switching process is simple, but it does need to be done in the right order.

To switch from central heating to electric mode:

• Close both the inlet and outlet radiator valves. This isolates the radiator from the rest of the heating system.
• Slightly loosen the bleed valve. This allows for thermal expansion as the element heats the trapped water.
• Switch on the electric element.

To switch back to central heating:

• Turn off the electric element.
• Close the bleed valve.
• Open both radiator valves.

That’s it. The two modes never run at the same time. Running both together can cause pressure problems inside the radiator and shorten the lifespan of the heating element.

Safety note: Always isolate the radiator from the central heating system before switching on the electric element. Never run both modes simultaneously.  

⚠️ SAFETY NOTE

Always isolate the radiator from the central heating system before switching on the electric element. Never run both modes simultaneously.

Are Dual Fuel Radiators Expensive to Run?

Running costs are lower than most people expect.

In central heating mode, a dual fuel radiator costs the same as any other radiator in your system. The element is off. The boiler does the work. There’s no additional cost at all.

In electric mode, costs depend on the element wattage and how long you run it. A 300W element running for two hours uses 0.6kWh of electricity. At current UK electricity rates, that’s a small amount to keep one room warm and your towels dry.

Compare that to firing up a boiler (typically 24kW or more) to heat every radiator in the house because one bathroom feels cold. The maths doesn’t add up. Dual fuel is far more targeted.

The real savings come from using each mode at the right time. Gas is cheaper per kWh than electricity, so you run on central heating through winter. Electric mode is for those in-between months when the boiler is off and you just need a bit of warmth in one room.

Which Rooms Suit Dual Fuel Radiators Best?

Bathrooms are the obvious choice. A dual fuel towel radiator keeps towels warm and the room dry throughout summer without touching the boiler. It’s the single most common use for dual fuel in UK homes.

Kitchens work well too. You might not need the heating on in May, but a cool morning still calls for a bit of warmth. Dual fuel handles that.

Extensions and conservatories tend to lose heat faster than the rest of the house. A dual fuel setup lets you top up those spaces independently.

And if you’re a landlord, dual fuel gives tenants control over bathroom and kitchen heating without relying on the central system. Fewer complaints. Better energy management.

Do Dual Fuel Radiators Need Professional Installation?

The answer is yes for most situations. Adding a heating element to an existing radiator involves both plumbing and electrics.

A qualified plumber or heating engineer can fit the T-piece and element to a radiator that’s already plumbed in. The job usually takes under an hour.

If the element needs a mains electrical connection rather than a plug, a qualified electrician should carry out that work. Electrical connections for heating elements must comply with Part P of the Building Regulations.

Important: Any work on gas central heating systems must be carried out by a Gas Safe registered engineer. We always recommend professional installation for dual fuel conversions.  

⚠️ IMPORTANT NOTICE

Any work on gas central heating systems must be carried out by a Gas Safe registered engineer. We always recommend professional installation for dual fuel conversions.

Browse Dual Fuel Heating Elements at Lincolnshire Radiators Direct

We stock electric heating elements in multiple finishes and wattages, ready to convert your existing radiator to dual fuel. Every order includes free UK mainland delivery, and our products come with up to a 20-year guarantee and 90-day hassle-free returns. Browse our electric heating elements or get in touch with our team for advice on sizing and compatibility.