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Electric vs gas boilers – which is right for your home?
Updated 07/26
By: Imogen Beech
Reviewed: Content Team
Gas remains the default for most UK homes, but electric boilers are a genuine option for smaller properties, especially those off the gas grid. Here's how they actually compare, and what's changed recently in the policy backdrop that often gets mentioned alongside this decision.
How electric and gas boilers actually work
The real pros and cons of each
Running costs, maintenance, and lifespan compared
What's actually changing under UK boiler policy, and what isn't
Roughly what to budget for either option
Who's qualified to install each type
Find central heating engineers near you
What is an electric boiler?
An electric boiler heats water using electricity rather than burning fossil fuels, passing water over a hot element before sending it to your radiators, taps, and showers. It works differently to a gas boiler under the bonnet, but the heating and hot water experience feels much the same day to day. Electric boilers are most common in smaller homes with lower heating and hot water demand, or properties not connected to the gas network.
Pros and cons of electric boilers
Pros: no gas supply needed; quieter operation; fewer moving parts, so easier to maintain; more eco-friendly; compatible with solar panels; no risk of gas leaks.
Cons: higher running costs than gas; still reliant on the UK's broader electricity generation mix, which includes fossil fuels; can struggle with larger properties' demand; no heating during a power cut.
What is a gas boiler?
A gas boiler burns natural gas to heat water passing through pipes near the flame, sending warm water to radiators, underfloor heating, taps, and showers. It remains the most common way to heat UK homes. Modern gas boilers need a small amount of electricity to ignite and keep running, but far less than an electric boiler uses overall.
Pros and cons of gas boilers
Pros: relatively low upfront cost; low running costs; wide choice of models on the market.
Cons: higher carbon emissions than electric; generally less efficient than electric (though modern gas boilers must be A-rated, reaching at least 90% efficiency); small risk of gas leaks; typically needs more regular maintenance; can't take advantage of flexible, time-of-use electricity tariffs the way electric heating can.
If you're weighing this decision partly because of what you've heard about gas boilers being phased out, our guide on what will replace gas boilers covers the current, accurate policy picture.
Gas vs electric boilers: key differences
Efficiency
Electric boilers convert electricity to heat with little to no loss, so they're inherently very efficient. Gas boilers must now be A-rated, reaching at least 90% efficiency, so the gap is smaller than it might sound, and higher efficiency doesn't automatically mean lower running costs.
Running costs
Electric boilers currently cost more to run than gas, since electricity remains more expensive per unit than gas. Our gas vs electric heating cost guide has current unit price comparisons, since these shift with the energy market. Pairing an electric boiler with solar panels, or using off-peak, flexible electricity tariffs, can help close this gap.
Maintenance costs
Maintenance costs tend to be lower for electric boilers, since they have fewer moving parts and are less prone to wear. Gas boiler manufacturers typically require annual servicing to keep your warranty valid. See our boiler service cost guide for current pricing on both.
Upfront cost
Costs for both types are broadly comparable overall, though gas boilers offer a wider price range given the larger market. Our new boiler cost guide has current supply-and-install pricing for both.
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Installation
Electric boilers are arguably slightly easier to install, since there's no gas supply, condensate pipe, or flue to connect. Like-for-like replacements are always more straightforward than switching boiler type or relocating it. Gas boilers must be installed by a Gas Safe registered engineer, by law.
Performance
Electric boilers can struggle with the heating and hot water demands of larger properties, so they're generally better suited to smaller homes and flats, though model ranges for both types continue to expand to cover a wider range of property sizes.
Sustainability
On sustainability, electric boilers produce no direct emissions and are more eco-friendly overall, though the UK's electricity grid still includes a fossil fuel component, so it isn't a fully carbon-free choice. That said, the renewable share of the grid continues to grow, and pairing an electric boiler with solar panels reduces your footprint further.
Lifespan
Lifespan favours electric: typically 15-25 years, versus a gas boiler's usual 10-15, largely thanks to having fewer moving parts to wear out.
Safety
Electric boilers carry no gas leak or carbon monoxide risk. Gas boilers carry a small risk of this, which is well managed with a carbon monoxide alarm and regular servicing, but it's a genuine difference worth knowing about.
Accessibility
If you're connected to mains gas, a gas boiler is the simplest option. If not, you're typically choosing between LPG, oil, and electric, with electric being the most straightforward and lowest-maintenance of the three, since it needs no fuel storage or deliveries.
What's actually changing in UK boiler policy?
Two things have changed recently: new-build homes now face a later (but firmer) deadline, and the phase-out plan for existing homes has been scrapped.
New-build homes: the Future Homes Standard, which requires low-carbon heating and effectively rules out gas boilers, was finalised and published in March 2026, and comes into force on 24 March 2027, later than the "2025" date often quoted in older articles. This only affects new-build properties.
Existing homes: an earlier government ambition to phase out new gas boiler installations by 2035 was dropped when the Warm Homes Plan was published in January 2026. There is currently no deadline requiring you to replace a working gas boiler in an existing home, and you remain free to repair or replace one like-for-like.
Which boiler is right for your home?
If you're on mains gas with a high heating and hot water demand, a gas boiler remains the more convenient, cheaper-to-run option.
If you're off the gas grid, in a smaller home or flat, an electric boiler is efficient, safe, low-maintenance, and better for the environment, provided your demand fits its capacity.
How to choose a reputable tradesperson for your boiler installation
Boiler installation isn't a DIY job. Gas boilers must be installed by a Gas Safe registered engineer. Electric boilers should be installed by a qualified electrical or heating engineer experienced with pressurised hot water systems. Read reviews and compare quotes before choosing.
How much does a new boiler cost in the UK in 2026?
Our comprehensive guide outlines the average cost of a new boiler, running costs, and potential additional expenses to budget for.
Once you've got a feel for typical costs, run through this checklist before you commit:
Before you choose
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FAQs
Gas is currently cheaper to run per unit, despite electric boilers being more efficient, since electricity costs more per kWh than gas. Check our gas vs electric heating cost guide for current figures.
Yes. A Gas Safe registered engineer removes the old gas boiler, flue, and condensate pipe and disconnects the gas line, then a qualified electrical or heating engineer installs the new electric boiler.
Typically 4 hours to 6 days, depending on whether it's a like-for-like swap or a change of type or location.
Yes, since they produce no direct emissions, though the UK grid still includes some fossil fuel generation, so it isn't entirely carbon-free.
No. The previously proposed 2035 phase-out for existing homes was dropped in January 2026. Only new-build homes are affected by the Future Homes Standard, from March 2027.
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