Guide to Electric Boilers: Costs, Installation & Best Options

To buy and install an electric boiler in your home you can expect to pay between £900 and £3,500 for the boiler itself, with installation costs adding approximately £600 to £2,500 to the cost.

Of course, to get more accurate electric boiler costs you will need to factor in your home’s size, the boiler brand and model you choose, and the type of heating system you are replacing. This guide covers everything you need to know about electric boiler prices, installation, running costs, and the best models available in the UK.

Introduction to electric boilers

What is an electric boiler?

An electric boiler heats water for central heating and domestic use like a gas or oil boiler, but unlike gas and oil boilers, electric boilers do not burn fuel. Instead, they use electric heating elements to generate heat. This can make them a more environmentally friendly option, especially when paired with renewable energy sources, but they are typically more expensive to run.

How do electric boilers work?

Electric boilers are connected to the mains electricity supply. The current passes through heating elements, which then heat the water circulating through the system. The heated water is pumped to radiators or underfloor heating systems to provide warmth, to taps and showers for hot water, or to a hot water storage cylinder.

Types of electric boilers explained

There are three main types of electric boilers on the market. Each involves a slightly different set up which may influence the electric boiler you install in your home.

• Electric combi boilers are all-in-one units that produce hot water on demand for both heating and showers or taps. This makes them an ideal choice for smaller homes with limited space.
• System electric boilers include a built-in hot water cylinder so they can store a higher volume of hot water. These boilers take their water supply from the mains so do not require a cold-water tank, making them suitable for medium-sized homes with higher hot water demand.
• Conventional electric boilers are also known as heat-only, regular, or traditional boilers. These require both a hot water cylinder and a cold-water storage tank in the attic to provide the boiler with water at a consistent pressure. This can make them more suitable for larger homes with multiple bathrooms.

Electric boiler costs in 2025

It’s important to understand the costs associated with installing an electric boiler before you decide whether it is the right solution for your property, lifestyle, and budget.

How much does an electric boiler cost? (Updated pricing)

Electric boiler costs (excluding installation) will vary depending on the type of boiler, the brand, and any additional features:

• Electric combi boilers: The cost of an electric combi boiler is likely to range from £900 to £4,500.
• System electric boilers: Typically cost between £1,000 and £2,700.
• Conventional electric boilers: Prices range from £1,200 to £3,000.

The exact cost of an electric boiler will depend on its heating capacity (how powerful it is) and the brand you choose.

Installation costs: what to expect

Installation costs for an electric boiler will vary based on several factors, but a basic installation, i.e., where you are replacing an old electric boiler with a new model, but leaving the rest of the system intact, is likely to cost £600 to £1,200.

However, if you are replacing a gas or oil boiler system or upgrading the entire heating system, installation costs could increase to between £2,000 to £4,000+.

Cost breakdown by home size & boiler capacity

The main factors that will influence electric boiler installation costs include the complexity of the installation, the need for electrical system upgrades, and the labour rates charged by your heating installer.

The below table gives some approximate estimates depending on the size of the property and the recommended power output.

Property size	Recommended output	Estimated total cost
1-bed flat	6-9kW	£1,500 – £2,800
2/3-bed house	9-12kW	£2,500 – £4,000
4+ bed property	12-15kW+	£3,500 – £6,000+

Electric boiler efficiency & performance

While the upfront cost of installing an electric boiler is important, arguably it is equally important to consider how much an electric boiler is going to cost you to run. Again, this answer will be different for every household depending on the demand placed on the boiler.

Are electric boilers energy-efficient?

Unlike gas and oil boilers which will waste 1-2% of the fuel they burn, electric boilers are nearly 100% efficient at the point of use, as all electricity is converted into heat.

However, the overall efficiency of an electric boiler depends on the source of electricity. If the electricity is generated from fossil fuels, the environmental benefits are reduced. If the electricity has been generated by solar panels or wind farms, an electric boiler becomes even more efficient.

How to calculate running costs based on usage

There is a simple calculation to help you estimate likely running costs.

To estimate running costs, multiply the average cost a unit of electricity by the likely kW usage of your home. For example, if electricity costs 28p per kW and your home uses 10,000 kWh per year, the annual running cost will be £2,800.

You should be able to find out your annual usage from your energy provider, recent bills or account statements.

Electric boiler vs. gas boiler: Which one saves more money?

Electric boilers are more energy-efficient in the sense that they do not waste the energy they use, but it is important to note that the price per unit of electricity can be significantly higher than gas.

Cost to consider	Gas boiler	Electric boiler
Price to install	Lower	Higher
Running costs*	Lower – 6.99p per unit	Higher – 27p per unit
Efficiency	89-94%	99-100%
Maintenance	More regular	Less regular

Of course, if you have solar panels installed that are generating free electricity for your home, this may make an electric boiler a more affordable option.

*Average unit cost displayed here is correct as of May 2025.

Pros and cons of electric boilers

Key benefits of electric boilers

While electric boilers are often more expensive to run than gas boilers due to higher electricity prices, they offer near-100% efficiency, lower maintenance, and zero emissions at the point of use. This can make them an attractive option for small homes, flats, or off-grid properties.

Zero emissions at point of use: With no need for the burning of gas or oil there are no direct CO₂ emissions while the boiler is in operation.

Compact and quiet: Electric boilers have fewer moving parts making them more compact and less noisy when working. This can make them ideal for homes with limited space.

Low maintenance: Fewer moving parts also reduces the need for regular servicing.

No need for flue or gas supply: The lack of a flue pipe (which takes the waste emissions outside the home) means the installation should be simpler. In addition, electric boilers also remove the risk of gas leaks and carbon monoxide poisoning.

Common disadvantages and limitations

While electric boilers offer many benefits, there are a few important considerations:

• Higher Running Costs: Electricity is more expensive than gas on a per-kWh basis, which can lead to higher running costs for heating, especially in larger homes with higher demand.
• Limited Heating Capacity: Electric boilers may struggle to meet the demands of larger homes or properties with multiple bathrooms. You may need to install multiple units to ensure sufficient heating.
• Dependence on Electricity Supply: Power outages can leave you without heat, making electric boilers unsuitable for homes in areas prone to unreliable electricity supply.
• Potential Need for Electrical System Upgrades: Larger electric boilers, particularly those with higher outputs, may require a three-phase electrical supply, necessitating potential upgrades to your home’s electrical infrastructure.

Best use cases for electric boilers (flats, small homes, off-grid properties)

Electric boilers aren’t a one-size-fits-all solution, but in the right setting, they’re an efficient and low-maintenance alternative to gas or oil systems. Here’s where they work best:

• Flats and Small Homes: With limited space and lower heating demand, electric boilers (especially compact combi models) are ideal for apartments, studios, and smaller houses where efficiency and quiet operation are a priority.
• Off-Grid Properties: If your home isn’t connected to the gas network, an electric boiler is a clean and hassle-free heating option, requiring no fuel deliveries or flue installations.
• Homes with Renewable Energy Sources: If you have solar panels, wind turbines, or battery storage, an electric boiler lets you make the most of your green energy, significantly lowering your running costs and environmental impact.

Electric boilers are most effective when matched to homes with modest heating needs, good insulation, and access to sustainable electricity sources.

Best electric boiler brands & models (2025)

Top 5 electric boiler brands reviewed

Choosing a trusted brand is key to long-term performance and reliability. Here are five of the most reputable electric boiler manufacturers available in the UK in 2025.

Heatrae Sadia: Renowned for their reliability and energy efficiency, Heatrae Sadia offers well-built electric boilers with a long-standing reputation in the market. Ideal for homeowners seeking trusted performance and solid after-sales support.

Elnur: Elnur provides a versatile range of models, catering to everything from small flats to larger homes. Known for robust design and straightforward installation, their boilers suit a wide variety of property types.

THERMAflow: Focused on high-performance, energy-efficient systems, THERMAflow boilers are a top choice for those seeking advanced heating capabilities and renewable energy compatibility (e.g. with solar thermal systems).

Electric Heating Company (EHC): EHC offers intuitive controls, Wi-Fi compatibility, and a variety of outputs, making their boilers user-friendly and well-suited to modern smart homes.

Fischer: Positioned as a premium brand, Fischer boilers come with extended warranties, excellent customer service, and advanced energy-saving features—though typically at a higher price point.

Each brand has its own strengths, so the best choice depends on your home size, energy goals, and budget.

How to choose the right boiler for your home

Choosing the right electric boiler means balancing performance, compatibility, and cost. Keep these key factors in mind:

• Larger homes or those with multiple bathrooms will typically need a boiler with a higher kilowatt (kW) output to meet hot water and heating needs efficiently.
• Make sure your home’s consumer unit, wiring, and supply can support the boiler’s power requirements. Some higher-output models may need a three-phase supply.
• Factor in both upfront purchase and installation costs, as well as long-term running expenses—especially electricity rates and potential upgrades.
• Look for added value such as smart controls, programmable thermostats, longer warranties, and high energy efficiency ratings to get the most out of your investment.

Consulting a professional installer can help you assess your home’s requirements and recommend the best-fit model.

Comparison: Electric combi boiler vs. standard electric boiler

Combi boilers are space-saving but may have higher running costs due to the lack of hot water storage.

	Electric combi boiler	Standard electric boiler
Hot water storage	No	Yes
Space requirement	Compact	Larger
Installation cost	Higher	Lower
Running costs	Higher	Lower

Installation guide for electric boilers

Can you install an electric boiler yourself?

While electric boilers are generally simpler to install than gas systems, DIY installation is not recommended and can be dangerous. UK regulations require installations to be carried out by a qualified electrician or heating engineer, especially if any rewiring or electrical upgrades are needed. Improper installation can void warranties, cause system failures, or even lead to electrical hazards.

Finding a qualified electric boiler installer

Choosing the right professional ensures a safe, efficient installation and long-term peace of mind. Here’s how to find a trusted installer:

• Look for official accreditation to ensure the installer is certified by recognised bodies such as NICEIC, RECC, or TrustMark.
• Look up installers on Google Reviews, Checkatrade, or Rated People to gauge customer satisfaction and reliability.
• Request recent customer references and confirm the installer has specific experience with electric boiler systems, not just gas.

Doing this homework upfront can save you from costly mistakes and ensure your boiler is installed to the highest standard. Compare multiple quotes e online comparison platforms to get competitive, itemised quotes from qualified engineers in your area.

How long does installation take?

Electric boiler installation times can vary based on your boiler type and the condition of your existing setup:

• Combi Boiler: Usually completed in 1–2 days, thanks to their all-in-one design and simpler installation process.
• System or Conventional Boiler: Can take 2–4 days, especially if additional components like hot water cylinders, tanks, or pipework need to be installed or upgraded.
• Electrical Upgrades: If your home needs a new consumer unit, upgraded wiring, or a three-phase supply, expect installation to take an extra day or more.

Planning ahead and working with a qualified installer helps minimise delays and ensures a smooth installation.

Cost of installing an electric boiler vs. a gas boiler

Electric boilers often have higher installation costs upfront, especially if your electrical system needs upgrading or you are replacing a different type of heating system. However, they are cheaper to maintain and don’t require annual gas safety checks.

Boiler type	Typical installation cost
Electric boiler	£1,000 – £2,500
Gas boiler	£500 – £1,500

Environmental impact & sustainability

Are electric boilers eco-friendly?

Electric boilers produce no emissions while they are being used, making them a cleaner alternative to gas which produces carbon dioxide when burned. Their eco-friendliness, however, depends on how the electricity is generated.

In 2025, the UK’s grid is over 50% powered by renewables and nuclear, making electric heating more sustainable than ever.

Carbon footprint comparison: Electric vs. gas boilers

	Electric boiler	Gas boiler
Direct emissions	None	200–300g CO₂ per kWh
Source emissions	Grid-dependent	Fossil fuel combustion
Annual carbon savings	1–2 tonnes of CO₂	High emissions if not offset

Switching from a gas to an electric boiler can reduce your carbon footprint, especially if you also switch to a green energy supplier or generate your own electricity.

How to make an electric boiler even more sustainable (solar panels & renewable energy)

You can make an electric boiler even more sustainable by pairing it with renewable energy solutions. Here are a few ways to reduce your carbon footprint and running costs.

• Install Solar Panels: Generate your own clean electricity and use it to power your boiler—cutting both emissions and energy bills.
• Use Time-of-Use Tariffs: Take advantage of cheaper off-peak electricity rates by heating water or charging thermal storage systems overnight.
• Improve Home Insulation: Proper insulation keeps heat in, meaning your boiler runs less often and uses less energy overall.
• Pair with Battery Storage: Store surplus solar energy during the day and use it to run your boiler in the evening, improving efficiency and independence from the grid.

Electric boiler maintenance & longevity

How long do electric boilers last?

Most electric boilers last 10 to 15 years, with some high-end models exceeding 20 years. Longevity depends on usage, water quality, and regular maintenance.

Common maintenance tips to improve efficiency

Keeping your electric boiler in top condition helps reduce energy waste, prevent breakdowns, and extend its lifespan. Here are four simple but effective maintenance tasks:

• Check the system pressure regularly. Aim for a pressure reading between 1 and 1.5 bar. Low pressure can reduce efficiency, while high pressure may indicate a problem.
• Bleed your radiators. Trapped air can prevent hot water from circulating properly. Bleed radiators once or twice a year to maintain even heating.
• Add inhibitor fluid to the system. A corrosion inhibitor helps protect internal components from limescale, rust, and sludge build-up, especially in hard water areas.
• Clean filters and test thermostats annually. A clogged filter or faulty thermostat can cause your system to overwork, increasing energy use and wear. Clean and test these components once a year.

Troubleshooting common electric boiler issues

Problem	Likely cause	Potential fix
No hot water or heating	Thermostat or fuse issues	Check settings and power supply
Leaking boiler	Faulty seals or valves	Call an engineer
Noisy operation	Air in the system or limescale	Bleed radiators, check water
Error codes on display	Manufacturer-specific faults	Refer to the manual or contact a professional

Finding the right installer

How to choose a reliable boiler engineer

Selecting the right professional is crucial to ensuring a safe, efficient installation. Here’s what to look for:

• Check for accreditations: Make sure the installer is NICEIC-registered for electrical work or Gas Safe-registered if you’re considering a hybrid system.
• Ask about experience: Find out how many electric boilers they’ve installed as practical experience matters.
• Request a detailed written quote: Avoid vague estimates. A transparent quote should include labour, materials, timeline, and any potential extras.
• Discuss warranty and aftercare: Ask about the length of the warranty, what it covers, and whether they offer ongoing maintenance or support.

Choosing a qualified, experienced engineer not only ensures compliance but also gives you peace of mind for years to come.

Red flags to avoid when hiring an installer

Unfortunately, some heating installers are not as trustworthy, knowledgeable or skilled as others. It is important to be cautious of the following red flags when choosing an electric boiler installer:

• Unwilling to provide references or proof of certifications
• Vague pricing, unclear quotes, or high-pressure sales tactics
• No insurance coverage or warranty support offered
• Limited or no experience with electric boiler systems

Remember, the lowest quote isn’t always the best value. You want to find a qualified, experienced installer who offers transparency and long-term support. This could save you time, money, and stress down the line.

Conclusion & next steps

Final verdict: Which boiler should you choose?

Electric boilers provide a cleaner, low-maintenance heating solution that’s especially well-suited to flats, smaller homes, and properties off the gas grid. They’re also a smart choice for homeowners investing in solar panels or battery storage, helping to offset electricity costs.

However, for homes with high hot water demand or multiple bathrooms, a heat pump or hybrid system may be a more practical and cost-effective option in the long run.

While electric boilers aren’t ideal for every property, they’re an excellent fit for the right home – offering quiet, compact, and environmentally friendly heating.

Get free boiler quotes & expert advice

If you are looking for a replacement electric boiler or considering installing an electric boiler for the first time, it is important to compare installation advice and quotes from at least 3-4 qualified heating engineers.

FAQs