Quick answer
For most UK homes with a mains gas connection, a gas boiler is still much cheaper to run in 2026 — gas costs about 7.33p per unit versus 26.11p for electricity (Ofgem price cap, 1 Jul–30 Sep 2026), so even a near-100%-efficient electric boiler typically costs roughly three times more to heat the same home.
Electric boilers win on a different scorecard: cheaper, simpler installation (no flue, gas pipe or Gas Safe certificate), no carbon-monoxide risk and fewer moving parts. They make most sense in flats, small or well-insulated homes, off-grid properties with no gas main, or where you can pair them with off-peak tariffs, solar or a battery.
This is general information to help you compare options, not financial, energy or gas-safety advice. Figures are indicative UK 2026 estimates and vary by home, region and tariff — confirm current prices with your supplier and speak to a qualified installer about your own property.
Electric vs gas boiler: the 30-second verdict
If your home is on the gas grid and you use a typical amount of heat, a gas boiler is the cheaper option to run in 2026 — usually by a wide margin. That is purely down to the price of fuel, not how good the boiler is.
Electric boilers are not the cheap-to-run choice, but they are cheaper and simpler to install, produce no carbon monoxide, need less servicing and are nearly silent. For flats, small homes and properties with no gas main, they can be the sensible pick.
The key point: electricity costs about 3.6 times more per unit than gas in 2026 (26.11p vs 7.33p per kWh). An electric boiler being "100% efficient" does not close that gap — you still pay roughly three times more to heat the same home.
How each boiler works
A gas boiler burns mains natural gas to heat water, which then circulates to your radiators and taps. The combustion gases are vented safely outside through a flue. It is efficient at turning fuel into heat, but burning gas is what creates the carbon-monoxide risk and the need for a flue and annual safety checks.
An electric boiler heats water by passing an electric current through a heating element — the same principle as a kettle. There is no flame, no flue and no combustion, so almost all the energy in each unit of electricity becomes heat.
That difference — burning a cheap fuel versus using an expensive one very efficiently — is the heart of the whole comparison.
Running costs compared — 2026 figures
Running cost comes down to three things: the unit price of the fuel, how efficiently the boiler uses it, and the daily standing charge for being connected. Here are the 2026 price-cap numbers.
| Gas boiler | Electric boiler | |
|---|---|---|
| Unit price (per kWh) | 7.33p | 26.11p |
| Boiler efficiency | ~90–94% | ~99–100% |
| Standing charge (per day) | 29.04p | 57.19p |
| Fuel needed for 12,000 kWh of heat | ~13,040 kWh | ~12,000 kWh |
| Approx. annual fuel cost | ~£956 | ~£3,133 |
Unit prices and standing charges: Ofgem price cap, standard variable Direct Debit national average, 1 Jul–30 Sep 2026. Rates vary by region — confirm yours with your supplier. Costs are illustrative and vary by tariff and how much heat you actually use.
Here is the worked example in full. A home needing about 12,000 kWh of heat a year (a fairly typical mid-size house) would draw roughly that figure for heating and hot water:
- Gas: at ~92% efficiency it must burn about 13,040 kWh of gas. 13,040 × 7.33p ≈ £956 a year in fuel.
- Electric: at ~100% efficiency it uses about 12,000 kWh. 12,000 × 26.11p ≈ £3,133 a year in fuel.
That is roughly 3.3 times more for the electric boiler — about £2,177 a year on this example. Add the standing charges (electricity is also nearly double) and the gap widens slightly.
As broad headline ranges for the same kind of demand: gas heating and hot water tends to land around £700–£1,300 a year, while an electric boiler is more like £1,600–£3,000+. If your bills feel high either way, see our tips to cut your gas bill, and our breakdown of how much gas central heating costs per hour.
Why electricity costs ~3.6x more per unit
The unit prices above are set by the Ofgem price cap, which limits the most a supplier can charge per kWh on a standard variable Direct Debit tariff. For 1 July to 30 September 2026 the cap puts electricity at about 26.11p and gas at about 7.33p per kWh (national average) — so electricity is about 3.6 times the unit price of gas.
That ratio is the single most important fact in this whole debate, and it is exactly the point most comparison articles gloss over.
People often assume a "100% efficient" electric boiler must be cheaper than a "92% efficient" gas one. It is not. Efficiency only tells you how much of each unit becomes useful heat — it does nothing about the price of the unit itself.
So an electric boiler wasting almost nothing still loses badly to a gas boiler buying fuel at roughly a quarter of the price. Better efficiency cannot beat a 3.6x cheaper fuel.
Installation costs compared
Here the electric boiler claws some ground back. Because there is no gas pipe to run, no flue to fit through a wall or roof and no Gas Safe gas certification required, installation is usually simpler.
| Typical install cost | What's involved | |
|---|---|---|
| Electric boiler | £1,500–£4,000+ | No flue, no gas pipe, no Gas Safe gas work — simpler, often quicker (electrical upgrades can add cost) |
| Gas boiler | £2,000–£3,500+ | Flue, gas pipework, Gas Safe registered engineer and certificate |
Indicative 2026 supply-and-fit ranges; complex jobs (consumer-unit or three-phase upgrades, moving the boiler position) can cost more. Get quotes for your home.
Electric boilers are also compact and can go in places a gas boiler cannot — there is no flue position to worry about, so a cupboard or loft space often works. For a fuller picture across all boiler types, see our guide to boiler installation costs.
Efficiency compared (and why it's misleading)
On paper, electric boilers look like the clear winner: they are usually rated at around 99–100% efficient at the unit, because nearly all the electricity becomes heat. Modern condensing gas boilers (A-rated under ErP) sit around 90–94%.
But "efficiency at the unit" ignores how the fuel is made and priced. Much of the UK's electricity is still generated by burning gas in power stations, with energy lost in generation and transmission before it reaches your home — which is part of why the electricity you buy costs so much more.
So the headline efficiency number is genuinely misleading on its own. A 100%-efficient appliance running on a fuel that costs 3.6 times more is the more expensive way to heat a home, full stop.
Servicing, maintenance & safety
This is where the two diverge sharply, and where boiler cover starts to matter.
A gas boiler burns fuel, so it carries a carbon-monoxide risk and a legal-safety dimension. It needs an annual service (typically £70–£120), and crucially:
Gas-safety bright line: any work on the gas supply, burner, flue, sealed combustion circuit, gas valve, PCB or pressure-relief valve must be done by a Gas Safe registered engineer — never a DIY job. If you smell gas or suspect carbon monoxide, leave the property and call the National Gas Emergency line on 0800 111 999.
An electric boiler has no flame, no flue and far fewer moving parts. There is no combustion, so no carbon-monoxide risk, and often no mandatory annual service. Faults still happen — elements, pumps and controls fail — but the safety profile is simpler. Electrical work should still be left to a qualified electrician.
That safety difference feeds directly into how cover and insurance work for each, which we cover below.
Electric boiler types — combi, system, dry-core storage
"Electric boiler" is not one thing. The main types decide whether it suits your home — and whether off-peak tariffs can rescue the running cost.
- Electric combi: heats water on demand for taps and radiators, like a gas combi. Output is usually modest (around 9–15kW), which suits a one-bed or one-bathroom flat but struggles with simultaneous demand in a busy household.
- Electric system boiler: works with a hot-water cylinder, so it can store hot water and serve more outlets. Better for slightly larger homes.
- Dry-core storage: heats a thermal core overnight on a cheap off-peak tariff and releases that heat through the day. This is the type that can make electric heating genuinely economic — it is built around night-rate electricity.
If you want to understand the equivalent gas-boiler categories, see combi vs system vs regular boilers.
Pros & cons of each
Gas boiler
- ✔ Much cheaper to run today (fuel is ~3.6x cheaper per unit)
- ✔ Scales to large, multi-bathroom homes with high demand
- ✔ Wide choice of models and engineers
- ✘ Carbon-monoxide risk; needs an annual Gas Safe service
- ✘ Needs a flue, gas pipe and a gas connection
- ✘ Burns fossil fuel — higher carbon emissions
Electric boiler
- ✔ Cheaper, simpler install — no flue, gas pipe or Gas Safe gas cert
- ✔ No carbon-monoxide risk; fewer parts to fail; near-silent
- ✔ Compact and flexible to site; no annual gas service
- ✔ Can pair with solar, batteries and off-peak tariffs
- ✘ Far more expensive to run at standard electricity prices
- ✘ Limited output — best for smaller homes and flats
Which is right for your home?
There is no single answer — it depends on your home, your gas connection and your tariff.
A gas boiler usually wins if you are on the gas grid, use a lot of heat, or live in a larger home with more than one bathroom. The cheap fuel and high output are hard to beat for that profile.
An electric boiler can make sense for a flat or small, well-insulated home with modest heat demand; where there is no gas main at all (electric or LPG often wins there); or where you can shift usage onto off-peak power or solar. If you are weighing oil too, see oil vs gas boiler.
Can off-peak tariffs, solar or batteries make electric cheaper?
This is the part rivals skip — and it is where electric heating can actually become competitive.
On a standard single-rate tariff electric will almost always lose. But the economics shift with the right setup:
- Off-peak tariffs (Economy 7 / EV-style night rates): off-peak electricity can drop to roughly 12–16p per kWh overnight in 2026. A dry-core storage system charges on that cheaper rate and releases heat through the day — closing much of the gap with gas.
- Solar PV: if you generate your own electricity, the daytime units effectively cost you nothing, which directly offsets an electric boiler's biggest weakness.
- Battery storage: a battery lets you buy cheap off-peak power, store it, and run the boiler on it later — pushing more of your usage onto the low rate.
The catch: off-peak tariffs charge a higher day rate, so they only pay off if a large share of your usage genuinely sits in the night window (as a rule of thumb, around 40%+). For a typical home on standard rates without solar or storage, gas still wins comfortably.
The future: gas boiler ban myth, Future Homes Standard, heat pumps
You have probably read that gas boilers are "being banned". That is worth unpicking carefully, because the scare is mostly a misunderstanding.
The Future Homes Standard is set to stop new-build homes being fitted with gas boilers as standard (low-carbon heating such as heat pumps instead). But it applies to new builds, not your existing home.
Myth-bust: there is no ban on repairing or replacing the gas boiler in your existing home in 2026. You can fix, replace or upgrade a gas boiler as normal. Only new-build properties are affected by the Future Homes Standard.
The long-term direction of travel is towards low-carbon heating, and heat pumps — not electric boilers — are the policy's intended replacement for gas. Heat pumps move heat rather than create it, so they sidestep the unit-price problem an electric boiler cannot. For the full picture, read is there a gas boiler ban in the UK?, the future of gas boilers, and heat pump vs gas boiler.
What about cover & insurance?
Whichever boiler you have, a breakdown is expensive and inconvenient — and cover can spread that risk. But cover for electric and gas boilers is not identical, and this is where the safety difference matters.
A gas boiler has a flue, sealed combustion circuit, gas valve and a carbon-monoxide risk, and any repair is a Gas Safe job. That makes a policy that includes an annual gas safety service and engineer call-outs genuinely valuable — see our guide to gas boiler insurance.
An electric boiler has fewer parts and no combustion, but elements, pumps and controls still fail, and an electrical fault can be just as disruptive — so protection still has its place. See electric boiler cover for how those plans differ.
A quick word on what "cover" actually means, because the labels get muddled. Some products are FCA-regulated insurance; others are unregulated service or care plans (a maintenance contract, not insurance) — always check which you are buying, as a service plan is not insurance. We compare a selected panel of providers, not the whole market, and may earn a commission if you buy through our links, at no extra cost to you. Prices are indicative ("from £X"), last checked in 2026 — always confirm the current price, cover and terms on the provider's own page before you buy.
Is an electric boiler cheaper than gas?
No — not to run, for most UK homes in 2026. Electricity costs about 26.11p per kWh versus 7.33p for gas (Ofgem price cap, 1 Jul–30 Sep 2026, national average), so an electric boiler typically costs roughly three times more to heat the same home, even though it is more efficient. Electric boilers are cheaper to install, though, and can be more competitive on an off-peak tariff or with solar.
Are electric boilers being phased in, or will gas boilers be banned?
There is no ban on repairing or replacing the gas boiler in your existing home in 2026. The Future Homes Standard is set to stop new-build homes being fitted with gas boilers as standard, but it applies to new builds. The long-term policy direction favours low-carbon heating such as heat pumps, but you can keep, fix and replace an existing gas boiler as normal.
How much does an electric boiler cost to run per year?
As a broad guide, an electric boiler meeting typical heating and hot-water demand tends to cost around £1,600–£3,000+ a year on standard 2026 electricity prices. In our worked example, a home needing 12,000 kWh of heat costs about £3,133 a year in fuel on electric, versus roughly £956 on gas. Your figure depends on how much heat you use, your tariff and your region.
Are electric boilers more efficient than gas?
Yes — at the unit. Electric boilers are around 99–100% efficient, versus about 90–94% for a modern condensing gas boiler. But efficiency only measures how much of each unit becomes heat; it does not change the unit price. Because electricity costs about 3.6 times more per kWh than gas, the more-efficient electric boiler is still much more expensive to run.
Do electric boilers need a Gas Safe engineer or an annual service?
No. Electric boilers have no gas supply, flue or combustion, so they do not require a Gas Safe registered engineer or a mandatory annual gas service, and they carry no carbon-monoxide risk (electrical work should still be done by a qualified electrician). Gas boilers do: any work on the gas, burner, flue, sealed circuit, gas valve, PCB or pressure-relief valve must be done by a Gas Safe registered engineer, and an annual service (around £70–£120) is recommended.
Can I replace my gas boiler with an electric one?
Yes. You are free to replace an existing gas boiler with an electric one, and there is no ban stopping you. Bear in mind the much higher running cost on standard tariffs, the typically lower output (electric combis often suit only flats or small homes), and that you may be able to cap the gas supply. This is general information, not personalised advice — speak to a qualified installer about your specific home.
Do electric boilers work with solar panels, and are they safer for carbon monoxide?
Yes on both counts. Electric boilers can run on electricity from solar PV, which offsets their biggest weakness — the high cost of grid units — and they pair well with batteries and off-peak tariffs. And because there is no combustion, an electric boiler produces no carbon monoxide at all, unlike a gas boiler.
Compare boiler cover the easy way
Compare boiler & central heating cover from a selected panel of UK providers and find a plan that fits your boiler and budget. Information, not advice — we show a chosen panel, not the whole market.
Compare boiler coverThis article is general information, not financial or gas-safety advice. We compare a selected panel of providers, not the whole market, and may earn a commission if you buy through our links. Always have gas appliances checked and repaired by a Gas Safe registered engineer; in a gas emergency call 0800 111 999. Prices are indicative UK guides for 2026 — confirm current prices on the provider's own site.