Cheapest Way to Heat a Room (UK 2026 Guide)
Are you fed up with being told to “just put a jumper on”? That advice gets old quickly when your house feels like a fridge and your energy bill already makes you wince. Yes, extra layers help. But if you actually want the cheapest way to heat a room, you need to think smarter than just piling on hoodies.
After the energy price chaos between 2020 and 2023, we changed how we heat our house. We stopped trying to make every room warm all day and focused on heating the room we’re actually using. That single shift cut our usage more than any gadget ever did.
If you’re searching for the cheapest way to heat a room UK, or even the cheapest way to heat a house, here’s what actually works in 2026.
The cheapest way to heat a room
Gas central heating (usually still the winner)
For most UK homes connected to the gas grid, gas central heating remains the cheapest way to produce heat overall. Under the energy price cap, gas typically costs around 6–7p per kWh, while electricity is closer to 24–28p per kWh. That’s a huge difference.
If you want to heat one room cheaply:
Turn the radiator up in the room you’re using.
Turn the others right down.
Close the doors.
Heating the entire house so one room is comfortable is one of the biggest money drains I see.
Thermostatic radiator valves (TRVs) are key here. They usually cost around £10–£15 each and are one of the best value upgrades you can make. A DIYer can fit them, or a plumber can do it quickly. They often pay for themselves within a winter.
Smart radiator thermostats are impressive, but expensive. Unless you genuinely use zoned scheduling, standard TRVs are often the more cost-effective choice.
If you’re reviewing your setup anyway, it’s also worth checking whether your hot water tank is cheaper left on or switched off between uses.
Also worth reading
If you have a separate hot water tank, take a look to see if it’s cheaper to be left on all the time
Oil-filled heaters (best electric option for longer use)
If you’re in an all-electric property, the maths changes.
Oil-filled radiators are one of the better electric heating options. They cost more upfront than basic fan heaters, but they retain heat well and provide steady warmth.
They’re ideal for:
Bedrooms
Home offices
Larger rooms used for longer periods
They’re slower to heat up, but once warm, they cycle on and off rather than constantly blasting at full power.
Standard electric heaters (short bursts only)
Electric fan or convector heaters are cheap to buy and portable. But here’s the truth: all electric heaters are 100% efficient at the point of use. A 2,000W heater costs the same to run whether it’s £20 or £200.
Marketing claims about “super-efficient” electric heaters don’t change the physics. If it’s 2kW, it costs 2kW per hour.
At current rates, running a 2kW heater for one hour costs roughly 50p–60p. Use that for five hours a day and you’re suddenly at £75–£90 per month.
Use them for:
Quick boosts of heat
Small rooms
Short periods only
Never leave portable heaters unattended and keep them away from curtains and furniture.
Cheapest way to heat a house
If you’re looking at the bigger picture and wondering what is the cheapest way to heat a house, here’s the straight answer:
Gas central heating is still cheaper to run than full electric heating in most UK homes.
Heat pumps are far more efficient (often 300–400% efficient in terms of heat output per unit of electricity), but installation costs are high unless you’re accessing government grants.
For most households right now, optimising existing gas heating is more realistic than ripping everything out.
Low cost heating solutions that actually reduce bills
Heating is only half the equation. Keeping the heat in is just as important.
Reflective radiator foil
Radiators on external walls lose heat into brickwork. Reflective foil pushes that heat back into the room. It’s cheap (usually under £20) and easy to install.
A simple radiator shelf can also help push heat outward instead of letting it rise straight to the ceiling.
Thermal curtains
Even double glazing loses heat. Thermal curtains reduce that loss significantly and usually cost no more than normal curtains.
Open them during sunny winter days to let free heat in. Close them at dusk to trap warmth. One of the top brands is Wallrock, which is available from Amazon or from stores like Screwfix.
Bubble wrap on windows
It’s not glamorous, but it works — especially for single glazing. Bubble wrap creates an insulating air layer and sticks with a light spray of water.
I’ve covered this properly in my guide on fixing bubble wrap to windows, and for some homes it genuinely makes a noticeable difference.
Loft insulation
Heat rises. An uninsulated loft lets huge amounts escape. Loft insulation remains one of the best returns on investment for cheap heating.
If you only do one “big” upgrade, this is usually it.
Draught proofing
Small gaps around doors and windows undo everything else. Draught excluders cost very little and take minutes to fit.
If you struggle with damp as well, it’s also worth looking at cheap ways to reduce condensation on windows, because moisture makes rooms feel colder.
Cheapest way to heat a room with electricity
If you have no gas supply and you’re fully electric:
Use off-peak tariffs where possible.
Heat the smallest practical space.
Use oil-filled radiators for longer sessions.
Use fan heaters only briefly.
Combine with heated throws or electric blankets.
Electric blankets and heated throws are incredibly efficient because they heat you directly rather than the air.
A heated throw typically uses 100–150W. That’s pennies per hour. Compare that to 2,000W from a fan heater.
We now use a heated throw most evenings instead of raising the thermostat, and it’s one of the easiest savings we’ve made.
Heat yourself instead of the room
Sometimes the cheapest way to heat your home is not to heat it much at all.
Hot water bottles are simple and effective.
Heated throws are perfect for sofa evenings.
Electric blankets cost just a few pence per hour if used to pre-heat the bed rather than left on all night.
Direct heat on your body is always cheaper than heating the air.
Change your energy tariff
Switching suppliers isn’t the goldmine it once was because of the energy price cap, but small gains still add up.
Some suppliers offer referral credit, saving sessions, or free electricity events (take a look at Octopus Energy. If you haven’t reviewed your tariff recently, it’s worth doing.
If you’re exploring broader ways to cut energy costs, have a look at some of the best energy-saving devices that genuinely reduce usage rather than just looking clever.
Also worth reading
Why not look at cheap ways to reduce condensation on your windows?
So what’s actually cheapest?
If you have gas:
Gas central heating targeted to one room wins.
If you’re all-electric:
Oil-filled radiator for steady use.
Fan heater only for short bursts.
Heated throw for personal warmth.
And regardless of system:
Insulation and draught proofing often save more than switching heaters.
Heating one room properly and keeping the heat in is almost always cheaper than half-heating an entire house all day.
If you’re trying to heat your home cheaply in 2026, focus less on miracle gadgets and more on smart usage, insulation, and heating the space you actually live in.
FAQs
What is the cheapest way to heat a room in the UK?
For most homes connected to the gas grid, gas central heating is still the cheapest per kWh. If you’re all-electric, an oil-filled radiator combined with good insulation and a heated throw is usually the lowest-cost option.
Is it cheaper to use an electric heater or central heating?
If you have gas central heating, it’s usually cheaper than running an electric heater for long periods. Electricity costs several times more per kWh than gas under the current energy price cap.
What is the cheapest way to heat a house without gas?
In all-electric homes, oil-filled radiators for steady heat and electric blankets for bedrooms are typically the most cost-effective solutions. Off-peak tariffs can also reduce costs.
Is it cheaper to heat one room or the whole house?
Almost always one room. Turning down unused radiators and closing doors can significantly reduce energy usage.
What is the cheapest form of heating overall?
For most UK households in 2026, gas central heating remains the cheapest running cost per unit of heat. However, insulation upgrades often save more money than changing the heating system itself.
