Best Electric Boilers in the UK: Reviews & Most Efficient (2025)

In order to bring you the most helpful and reliable list of the best electric boilers, we’ve used our tried and tested GreenMatch review process. This process includes conducting thorough research and comparisons in a few important key areas. These include:

Now that you understand our research process, let’s get into our results. Below, we’ve listed the best electric boilers in each boiler type category. This way, you can easily find something that suits your needs.

Electric combi boilers can provide a home with heating and hot water all from one unit, eliminating the need for separate storage tanks. They’re great for homes low on space and can be fitted in discrete spaces such as a kitchen cupboard.

Due to these perks, combi boilers are the most popular choice for homeowners in the UK, so it’s good to know there are plenty of great electric combi boiler options available.

Electric combi boiler costs range from £1,000 to £3,000. Below, we’ve detailed some of the best combi models from reputable brands.

Outputs: 12kW, 14.4kW (single phase), 19kW, 26kW (three phase)
Energy efficiency: 100%
ErP Rating: D (heating), A (hot water)
Warranty: 5 years (terms apply)

Price: £1,400 - £1,850 (excluding installation)

This premium combi boiler from EHC is designed for homes with no access to the gas grid or those with gas restrictions (such as listed buildings). 

The Mercury electric combi boiler is best suited for small to medium-sized homes with 1 - 3 bedrooms and up to 3 bathrooms. This is because this model offers two output ranges: those for smaller properties with up to 10 radiators (12kW and 14.4kW) and those with slightly larger demand, up to 17 radiators (19kW and 26kW).

However, it’s important to note that the single-phase model is not recommended for homes with baths unless used in an 'S' Plan configuration and installed alongside a hot water cylinder. For greater demand, look to an electric system boiler model instead.

Key features:

Outputs: 7kW, 11kW, 14.4kW (single phase), 18kW, 21kW, 24kW (three phase)
Energy efficiency: 100%
ErP Rating: D (heating), A (hot water)
Warranty: 5 - 10 years (terms apply)

Price: £1,050 - £1,900 (excluding installation)

Another great offering from Strom is their electric combi boiler. With one of the largest output ranges on offer, this boiler is suitable for multiple uses in both small and medium properties.

Strom’s unique ‘Serpentine’ heating element ensures quicker heat times and longevity, making this a highly reliable choice.

An integrated pump and expansion vessel also make installation easier and quicker. These boilers are designed to look and work in a way which is familiar to gas and oil boiler users, making it easier for homeowners to adapt to the change.

Key features:

Outputs: 8kW, 10kW, 12kW
Energy efficiency: 99.8%
ErP Rating: D (heating) C (hot water)
Warranty: 5 years (terms apply)

Price: Mini: £1,000 - £1,670 / Maxi: £1,990 - £2,722
(excluding installation)

Trianco’s Aztec combi boiler is ideal for properties where instant hot water is needed. This model comes in a ‘Mini’ and a ‘Maxi’ version.

The Mini combi is suited for small homes which need a compact solution (such as a flat), with 1-2 bedrooms and 1 bathroom. The Maxi version is best for those requiring a larger hot water supply, as it includes a built-in 38-litre hot water storage tank. 

This model is also compatible with hybrid heat pump configurations and solar panels, making it a great choice for those looking to reduce their environmental impact and drastically reduce their heating running costs. 

Maxi dimensions: H 1,010mm x W 500mm x D 300mm. 
Mini dimensions: H 580mm x W 360mm x D 240mm.

Key features:

If you’re excited to get started with a new electric combi boiler, you should first consult multiple qualified installers to get the best advice and compare quotes. However, tracking down trustworthy installers on your own can be a long, stressful task.

It can take hours or days to find those you trust and even longer to fill in forms, make calls, and wait to hear back. There is a much simpler way, though! By completing our 30-second form.
We’ll connect you with up to 3 qualified, vetted installers, all from your area, who can provide quotes. 

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System boilers are a great choice for homes with a higher demand for hot water. They work alongside a hot water storage cylinder and take their water supply directly from the water mains.

Electric system boilers are quite common, so there are plenty of options on the market if this is the right boiler type for you. Below, we have provided some details about what we consider to be the best models available.

Outputs: 4 - 8kW (230V single-phase), 4 - 24kW (400V three-phase)
Energy efficiency: 99.4%
ErP Rating: D
Warranty: 2 years (terms apply)

Price: £1,138 - £1,390 (excluding installation)

From the boiler manufacturing powerhouse Viessmann, the Vitotron 100 electric system boiler is a sleek solution for homes without gas access. When paired with a hot water cylinder, this boiler can provide heating and hot water on demand.

It is available in both single-phase (4-8 kW) and three-phase (4-24 kW) models, making it suitable for a wide range of properties. The single-phase is great for homes with up to 10 radiators and 1 bathroom, whereas the three-phase can serve larger homes or commercial buildings. 

This model is compatible with solar panel systems, allowing homeowners to use renewable energy sources for their heating. It is also designed for low maintenance and can work with most central heating systems and hot water cylinders.

Key features:

Outputs: 3 - 12kW (single and three phase), 13kW, 15kW (three phase)
Energy efficiency: 100%
ErP Rating: D
Warranty: 2 - 5 years (terms apply)

Price: £1,020 - £1,460 (excluding installation)

When paired with a hot water cylinder, the Elnur MAS15 is a great solution for homes requiring heating on demand. It is best for smaller properties, as it offers outputs up to 12kW.

Compatible with traditional and underfloor heating, this model is flexible. It includes extensive safety features, such as legionella and frost protection with auto heating regulation.

The MAS15 can also be used with solar panels or heat pumps, enhancing its energy efficiency and making it a low carbon heating solution.

Key features:

Learn more about air source heat pumps in the UK.

Outputs: 2kW - 24kW
Energy efficiency: 100%
ErP Rating: D
Warranty: 5 years (terms apply)

Price:  £1,235 - £1,822 (excluding installation)

Another entry in our list for EHC is the Comet PV system boiler. This electric heating system offers a vast range of output options, from 2kW to 24kW. 

When paired with a hot water storage cylinder, the Comet PV is a good option for small and medium homes with up to 2 bathrooms. Different power model options are available, however, with each operating at various voltages (consult a qualified installer for the best advice on your needs). 

Specifically engineered for solar panel compatibility, this model makes an efficient and environmentally friendly home heating solution.

Key features:

If you’re looking for a compact, system electric boiler replacement we think these three models are great choices to consider. However, depending on the size of your home and your unique heating requirements it’s recommended that you seek advice from qualified installers. 

Finding a trusted, vetted installer for your new boiler fitting can seem like a daunting task on your own. It can take days, or even weeks, to read reviews and wait for call backs. To cut down on this hassle, you can use our service instead.

Filling in our 30-second form will give us all we need to connect you with up to 3 boiler installers in your area. These are fully vetted professionals you can rely on. They will send you competitive quotes so you can choose the right installer for your budget.

It’s completely free, with no obligations attached. Just click below to get started. 

Regular boilers are less common than they used to be, as they require a lot of additional space and pipework. This is because they work alongside a cold water feed tank in the loft and a separate hot water storage cylinder.

However, for homes looking to replace or upgrade their existing regular boiler, there are new electric regular boiler options available. Often these are known as ‘flow boilers’. We’ve listed some of the best that are currently on the market below.

Outputs: 4kW, 7kW, 10kW, 12kW, 14.4kW
Energy efficiency: 100%
ErP Rating: D
Warranty: 5 years (terms apply)

Price: £680 - £880 (excluding installation)

The SlimJim electric flow boiler from EHC is a low-cost, compact choice from one of the best brands on the market. Due to its slim design, it is best suited for small to medium-sized homes. 

Available in various outputs, from 4kW to 14.4kW, it’s ideal for those with 1 - 2 bedrooms. It is also suitable for properties requiring both heating and hot water, as it can be configured in an 'S' Plan setup to provide either or both simultaneously.

Key features:

Outputs: 4kW, 6kW, 9kW, 11kW, 12kW (Standard & underfloor models)
Energy efficiency: 99.8%
ErP Rating: D
Warranty: 2 years (terms apply)

Price: £650 - £1,180 (excluding installation)

Designed and manufactured in the UK, the Amptec flow boiler from Heatrae Sadia is another highly efficient electric boiler. It’s great for properties with limited space, such as apartments. 

With a good range of outputs, from 4kW to 12kW, it’s a suitable choice for small homes with up to 10 radiators and 1 - 2 bathrooms. 

This model also boasts some unique features, such as silent operation, thermal cut-out protection and compatibility with central and underfloor heating systems.

Key features:

Outputs: 6kW, 9kW, 11kW, 14.4kW (single phase)
Energy efficiency: 100%
ErP Rating: D
Warranty: 5 years (terms apply)

Price: £700 - £880 (excluding installation)

This heat-only boiler from Strom is a stylish choice for homes low on space, where a simple heating solution is best. It’s ideal for small to medium size homes, offering 6kW to 14.4kW. 

With Strom’s unique heat exchanger technology, issues like corrosion, wear and tear and limescale are eliminated – making them stand out from their competitors for a longer, reliable performance. 

Key features:

As more electric boiler models come to market, homeowners have more choices than ever before. Understanding what type of electric boiler is best for your home, though, can be confusing. 

First, it’s important to note that electric boilers are less powerful than traditional fossil-fueled boilers (such as gas or oil). This means they are typically not suitable for larger properties with more than 3 bedrooms or 2 bathrooms. 

Factors that determine the boiler you need include how many radiators you have and the size of your home as this determines your heating and hot water demand levels. To help you understand your choices, we’ve outlined each boiler type below, along with the homes they are best suited to.

The boiler type you need can be determined by the hot water demand of your home. If you have multiple bathrooms (2 or more), you’re likely to need a system boiler as they can deliver larger quantities of hot water from a storage cylinder. In some cases, electric combi boiler models with higher outputs can meet this demand, but you will need to confirm this with your installer. 

For smaller homes, a combi boiler will not only save you space but can supply hot water on demand for up to 2 bathrooms. To understand exactly what your home needs, however, it’s recommended that you speak to multiple qualified boiler installers. They can give you the best advice and offer you quotes to compare, so you can find the right price for your budget. 

Finding trusted installers on your own can be a stressful task, reading endless reviews and waiting for call backs. Instead, fill in our 30-second form, and we’ll do all the work for you. It’s completely free and you’ll get up to 3 quotes from vetted installers local to you. 

It’s free and simple, and there are no obligations attached. Just click below to begin.

In recent years, electric boiler brands have become more prevalent with more manufacturers offering these unique heating solutions. To choose the best electric boilers for our list, we focused, in part, on the strength of the brands behind the models. 

Below are the brands we chose to include in our list and why they are considered to be amongst the very best.

Electric Heating Company (EHC)

EHC is one of the most well-known brands of electric boilers in the UK. They offer widely available products and a range of models, including combi, system, and regular electric boilers.

EHC is recognised for its high-efficiency, compact, and easy-to-install boilers. With smart app control and awards for customer service. Scoring a 4.8 out of 5 on Trustpilot, EHC is a leader in the electric heating field, making it a must-have for our list.

Heatrae Sadia (part of Baxi)

With over 95 years of experience, Heatrae Sadia is one of the largest producers of electric heating systems. As part of the Baxi Group, their electric boilers are backed by a widely recognised and respected home heating brand which receives a 4.6 out of 5 on Trustpilot.

Heatrae Sadia offers award-winning, highly efficient and reliable products. Durable stainless steel parts ensure a long lifespan, coupled with great customer satisfaction rates, these products have an excellent reputation.

Viessmann

Renowned German heating specialist Viessmann is a brand we often feature in our lists. They are highly regarded for providing the finest engineering and industry-leading technology.

Its Vitotron electric boiler offers high efficiency and automatic power modulation to adjust heating based on demand. Viessmann boilers are praised for reliability and consistent performance. Its excellent customer support includes prompt warranty service and comprehensive aftercare, earning it a 4.4 out of 5 on Trustpilot.

Strom

Based in the UK, Strom specialises in electric heating products. Its models are more widely available than some other brands, offering wide output ranges and boiler types to suit multiple homes.

The vast range and accessibility make Strom a must for our list of best electric boilers. It is also rated highly, with 4 out of 5 stars on Trustpilot, for its boiler’s ease of use and extended warranty offers.

Trianco

For high quality, and an extensive history, Trianco is another brand that deserves a place in our recommendations. Its electric boilers are recognised for efficiency, reliability, and versatility.

Designed to work with renewable energy sources, Trianco boilers offer a range of unique benefits, such as smart app controls and overheat protection. With a 3.8 out of 5 in customer reviews, it rates very highly for safety features, lengthy warranties and overall customer satisfaction.

Elnur

Another brand recognised for electric boilers is Elnur. It offers a range of products and is frequently praised for innovation and customer service, with a 4.2 on Trustpilot.

With smart technology, stainless steel elements, and silent power switches, Elnur boilers are built to last. Extensive warranties and technical support also ensure reliability and customer satisfaction.

If you live off the gas grid or are looking for an alternative to traditional boiler fuels, an electric boiler could be a great choice. If you live in a small to medium-sized home, the lower power of electric boiler models means you have a great range of choices. 

However, when doing your electric vs gas boiler research, it is crucial to note that due to fluctuations in energy prices in the UK, an electric boiler can cost much more to run than a traditional option. For example, per unit of electricity is approximately 27p/kWh compared to gas which is only 7p/kWh.

One key benefit, however, of an electric boiler is that if you own solar panels, they can be run at almost no cost if you’re generating your own renewable electricity. This is one aspect that you should consider carefully when choosing a new boiler. 

The best way to understand if an electric boiler is a good choice for your home is to consult a professional boiler installer. They can advise you on your options and provide quotes to install the best system for your needs. 

Tracking down a trusted installer can seem like an exhausting task, with countless reviews to read through and forms to submit just to wait days for a call back. However, there is an easier way!

Just fill in one simple form, and in 30-seconds we’ll have all we need to do the leg work for you.

We’ll connect you with up to 3 qualified installers from your area, so you can compare quotes for new boiler costs to find something within your budget. 

It’s completely free, with no obligations attached. Just click below to get started.