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Last updated: 25th March, 2024


Best Electric Combi Boilers

Best Electric Combi Boilers

Key takeaways

  • Electric combi boilers offer efficiency and space-saving benefits in an environmentally conscious package.
  • Careful selection and installation are essential to maximise the performance and cost-effectiveness of the boiler.
  • Premium electric combi boilers come with a promise of longevity, reducing the need for frequent replacements.

An electric combi boiler is a compact unit that provides both central heating and hot water in a single system without the need for a separate water tank or cylinder.

Electric combi boilers represent a transformative advancement in home heating technology, offering a blend of efficiency, convenience, and reduced environmental impact. These modern heating solutions cater to the increasing number of homes looking to switch from traditional gas boilers to greener alternatives, an important consideration amid the pressing need for sustainable living. 

As homeowners weigh their options in 2024, the array of electric combi boilers available presents both opportunities and challenges, including choosing the right model to meet specific home heating needs and navigating the various cost implications.

Understanding the intricacies of electric combi boilers is key when upgrading a home heating system. These boilers are all-in-one units that provide both heating and hot water on demand without the need for a separate water tank or cylinder, thereby saving space and potentially simplifying installation. When combined with the use of off-peak electricity tariffs, these systems can offer considerable cost savings

Moreover, the predicted longevity of high-quality electric combi boilers further strengthens their appeal, promising a durable solution that counters the shorter lifespan often associated with traditional gas boilers.

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Understanding Electric Combi Boilers:

This section delves into electric combi boilers, contrasting them with gas alternatives and highlighting their advantages and limitations, particularly regarding their impact on the environment and energy consumption.

What Is an Electric Combi Boiler?

An electric combi boiler is a compact unit that provides both central heating and hot water in a single system without the need for a separate water tank or cylinder. These systems convert electricity into heat, furnishing homes with a central heating solution that is often considered more environmentally friendly, as they do not burn fossil fuels and thus do not produce carbon emissions on-site.

Electric Combi Boilers vs Gas Boilers


Gas Boilers

Electric Boilers

  • Gas is currently the cheapest fuel on which to run a boiler.

  • Boiler manufacturers claim their electric boilers are almost 100% efficient.

  • Modern gas boilers are often ‘A’ rated in terms of ErP.

  • No risk of potential carbon monoxide leak.

  • Gas boilers heat up a home quicker than other boiler types.

  • Quieter when running compared to most boiler types.

  • Gas is a tried and tested, readily available fuel source.

  • Can be installed anywhere in the home.

  • Replacements in terms of unit for unit tend to be easier.

  • Usually compact in size.

  • Can meet high hot water demands.

  • Annual service is recommended but not required.


Gas Boilers

Electric Boilers

  • Higher initial unit purchase cost.

  • Currently an expensive fuel in terms of boiler running cost.

  • More emissions released than some boiler types.

  • Possibly not suitable for larger homes.

  • Annual service mandatory.

  • The initial production of electricity can be carbon intensive.

Gas Boiler vs Electric Boiler Cost-

Initially gas boilers usually demand a higher purchase price per unit than electric boilers, however the difference in running cost may hold the most sway over your opinion.

Gas is currently the cheapest fuel source to power a boiler, and would eventually bridge the gap in initial cost disparity when compared to electric boilers.

Also gas being abundant in terms of ready availability means it is more reliable than electricity which could be subject to potential power cuts.

Gas also has a general wider model selection, meaning there is ample opportunity for a thorough price comparison before committing to a purchase.

Benefits of Electric Combi Boilers

  • Environmentally Friendly: They produce no on-site emissions which considerably lower the household's carbon footprint.

  • Energy Efficient: They convert almost all the electricity into heat, reducing wastage.

  • Safety: Electric combi boilers do not use combustible fuel, mitigating risks associated with gas leaks.

  • Space-Saving: With no need for a separate water tank, these boilers save space and can be easier to install.

The advantages of electric boilers, especially when powered by renewable energy sources, include a significant reduction in carbon emissions and increased safety. They fit perfectly into the modern home, where space-saving solutions and environmental considerations are paramount.

Disadvantages of Electric Combi Boilers

  • Higher Running Costs: The cost of electricity is typically higher compared to gas, so running costs can be increased.

  • Performance: In large homes, electric boilers may struggle to meet high hot water demand.

  • Gas Boiler Ban: Notwithstanding the speculated gas boiler ban in new-builds, existing homes with gas boilers may find the transition to electric costly.

Whilst electric combi boilers present a progressive step towards reducing household carbon emissions, they do bear higher running costs. The potential future restrictions on gas boilers, however, are likely to see more households shift towards electric solutions.

Key Considerations for Installation

When planning to fit an electric combi boiler, homeowners should pay close attention to the installation process, the factors influencing the price, and selecting the appropriate model for their residence.

Installation Process

Equipping a home with a new electric combi boiler requires understanding the scope of work. Since these boilers are compact and don't necessitate a separate cylinder, the installation is usually straightforward. However, this assumes easy access to the mains electricity supply and the existing pipework. To ensure efficiency, the installation should always be conducted by a certified professional who can integrate the system seamlessly with the home's existing infrastructure.

Installation Cost Factors

The cost of installing an electric combi boiler often varies depending on several key factors:

  • Upfront Price of the Boiler: Prices typically range from £900 to £2,500 for standard models.

  • Labour Costs: Expect to budget between £650 and £2,500 for professional installation services.

  • Additional Supplies: Occasionally, new components such as pipework or electrical upgrades may be necessary.

  • Property Specifics: The size of the house and ease of installation can impact the overall cost.

Creating a comprehensive budget beforehand can prevent unexpected expenses.

Selecting the Right Model

For homeowners, picking the correct electric combi boiler model is pivotal for both performance and cost-effectiveness. Consider the following when making a selection:

  • Boiler's Capacity: Must be sufficient to meet the hot water and heating demands of the household.

  • Energy Efficiency: Higher efficiency equates to lower running costs, aligning with environmentally conscious choices.

  • Physical Size: Ensure the boiler's dimensions fit the designated installation space.

  • Manufacturer's Reputation and Warranty: Opt for reputable brands offering substantial warranties to safeguard the investment.

Assessing these various factors contributes to a well-informed decision, aligning the benefits of an electric combi boiler with the specific needs of the home.

Energy Efficiency and Running Costs

In the rapidly evolving landscape of home heating, electric combi boilers stand out for their energy efficiency and the attendant running costs. These factors are at the forefront of a homeowner's agenda, directly influencing long-term financial outlay and environmental footprint.

Operating Costs Comparison

Electric combi boilers typically incur higher running costs compared to their gas counterparts. According to Ofgem, the energy price cap unit rate for electricity is £0.28 per kWh, while it's £0.07 per kWh for natural gas, making electric boilers less economical in terms of pure unit energy costs.

  • Electricity: £0.28 per kWh

  • Natural Gas: £0.07 per kWh

However, it's essential to consider that electric boilers can achieve close to 100% efficiency, whereas gas boilers may only reach around 90%. This means that, for every unit of electricity used by an electric boiler, nearly all of it is turned into heat, while a gas boiler loses a portion through exhaust.

Energy Efficiency Ratings

The Energy Saving Trust in the UK provides ratings that help consumers understand the energy efficiency of home appliances, including electric combi boilers. Electric boilers, while expensive to operate, can be remarkably efficient, with some models reaching an efficiency level of nearly 100%. This is due to the direct conversion of electricity to heat, avoiding the combustion process and thereby eliminating exhaust losses.

  • Typical Efficiency for Electric Boilers: ~100%

  • Typical Efficiency for Gas Boilers: ~90%

Moreover, for homes equipped with solar panels, the efficiency of electric boilers can be leveraged during daylight hours, potentially using renewable energy to power the boiler, further diminishing the carbon footprint and possibly mitigating electricity costs.

Impact on Energy Bills

The impact on energy bills is a pressing concern for many. Although the initial setup of an electric combi boiler might seem favourable due to typically lower installation costs, the long-term effect on energy bills can be substantial due to the higher cost of electricity. Households opting for electric boilers should therefore weigh up the long-term implications on their energy bills amidst rising electricity prices.

The integration of smart controls and thermostats can ameliorate running costs to some degree, allowing precise control over heating and hot water schedules to match occupancy patterns, diligently conserving energy where possible. Despite higher running costs, the elimination of gas supply and the potential for incorporating renewable energy sources contribute to a modern and often environmentally-conscious heating choice.

Analyzing these factors is paramount when deliberating the switch to an electric combi boiler, as it affects both the wallet and the planet.

Boiler Types and Features

A discerning homeowner or installer seeking an electric combi boiler in 2024 should be well-informed of the various types available, their power capacity, and the advanced features they offer.

Exploring Different Types of Electric Combi Boilers

Electric combi boilers have become an effective solution for homeowners, catering to both hot water and central heating needs without the reliance on gas or oil. The types of electric boilers in the market range from compact models, ideal for small apartments, to more robust units designed to meet the demands of larger homes. Brands like EHC and Alpha have made a notable presence, often being cited among the best options available. They differentiate themselves through their construction, intended application, and most importantly, the underlying technology they employ, such as digital modulation for efficient energy consumption.

Boiler Capacity and Heating Output

The output rating of an electric combi boiler is a critical factor, directly influencing its suitability for a property. Outputs are measured in kilowatts (kW), with smaller properties often adequately served by boilers with a rating around 12 kW, while larger homes might necessitate a system with up to 38 kW. Variability in water flow rate is also an essential consideration, impacting how quickly a boiler can supply hot water. The best electric combi boilers provide a balance between power output and efficiency, ensuring optimal performance without excess energy waste.

Innovative Features and Smart Control

In 2024, the integration of innovative features and smart controls is the standard for top-tier electric combi boilers. These advancements offer homeowners a clear interface for monitoring their system's performance and making adjustments, leading to cost savings and a reduced carbon footprint. Smart controls enable the user to tailor heating schedules, adjust temperature settings remotely, and even predict heating needs based on usage patterns. Brands have increasingly adopted these features, with the aim of providing not just comfort, but also convenience and control over domestic energy usage.

Smart technology in boilers allows for digital modulation, a process that adjusts the energy output to match the specific heating demand at any given time, thus contributing to the overall efficiency of the heating system. Manufacturers employ boiler guides and manuals featuring precise specifications to assist in selecting the correct model, ensuring consumers make informed decisions based on their individual heating requirements.

Selecting the Best Electric Combi Boiler

When looking to invest in an electric combi boiler, it's imperative to assess both the size of your home and your domestic hot water needs. The best combi boilers must serve these two factors efficiently.

Top Picks for Smaller Homes

For those with compact living spaces, the Elektra EK.C Combi Boiler stands out due to its size efficiency and sufficient capability for a smaller home's heating and hot water requirements. Suitable for a flat or a house with one bathroom, this model's popularity is a testament to its reliability and ease of fitting into confined spaces.

Best for Multiple Bathrooms

In contrast, larger households, particularly with multiple bathrooms, demand a more robust solution. The Elnur’s Mattira MAC15 is a favourable option in this regard, capable of managing the demands for simultaneous hot water usage—an essential for families or homes with several occupants.

Electric Combi Boiler Brands Review

Diving into customer feedback reveals key insights about the best boiler brands. The Comet Combi Boiler is frequently lauded for its consistent performance and ease of installation. Typically, a more extensive corpus of positive customer reviews tends to indicate a reliable purchase. Brands like Boiler Central are also mentioned for their comprehensive service, including installation and a fixed pricing model, which avoids unpleasant financial surprises post-purchase.

Here's an overview of notable electric combi boilers mentioned:



Notable Feature


Mattira MAC15

Suits multiple bathrooms, high efficiency

Electric Heating Co.

Comet Combi Boiler

User-friendly, minimal space requirement


EK.C Combi Boiler

Ideal for smaller homes, compact design

With these considerations in mind, selecting the optimal electric combi boiler can be a less daunting task. Focusing on the size of your home, your hot water needs, and brand reliability will guide you to the best choice for your living situation.

Best Electric Combi Boilers

The landscape of electric combi boilers is evolving, with several models standing out in 2024 for their efficiency and performance. Below is a detailed look at some of the top contenders.

Electric Heating Company Comet Electric Combi Boiler

The Electric Heating Company Comet electric combi boiler is renowned for its efficiency and compact design. Ideal for small to medium-sized properties, it offers a stainless steel heat exchanger and a built-in pump, which enhances its longevity and ensures quiet operation.

  • Efficiency: High

  • Suitable for: Small to medium-sized homes

  • Notable features: Stainless steel heat exchanger, quiet operation

Heatrae Sadia Electromax Electric Combi Boiler

Heatrae Sadia Electromax is a robust solution for homes needing both domestic hot water and central heating. It integrates seamlessly with standard radiators and thermostatic radiator valves, providing homeowners with convenience and control.

  • Installation: Seamless with standard radiators

  • Control: High with thermostatic valves

  • User-friendly: Yes, intuitive controls

Elnur Mattira MAC15 Electric Combi Boiler

The Elnur Mattira MAC15 electric combi boiler distinguishes itself with precision temperature control. It ensures optimal comfort, while its energy efficiency reduces electricity consumption.

  • Temperature Control: Precision level

  • Energy Efficiency: Noteworthy, reduces running costs

  • Build: Durable components

Thermaflow Floor-Standing High-Efficiency Electric Combi Boiler

Thermaflow's floor-standing model garners attention for its high efficiency. Suitable for larger properties, the unit can provide substantial savings on energy bills.

  • Suitable for: Larger properties

  • Energy Savings: Significant, due to high efficiency

  • Installation: Requires more space due to floor-standing design

Cost Considerations

Purchasing an electric combi boiler involves evaluating both the initial price and ongoing operational costs. This section examines these expenses closely to aid buyers in crafting an informed budget.

Understanding Boiler Costs

When assessing the boiler cost, one must first distinguish between the price of the boiler itself and the additional installation costs. Boilers vary widely in price: a typical electric combi boiler range may span from £900 to £2,500, with top-tier models reaching approximately £4,500. Understanding this spectrum is crucial for homeowners to identify the options that align with their financial parameters.

Comparing Prices of Different Models

Comparing prices of various models is a pivotal step. Below, a comparison table presents a snapshot of different electric combi boilers accompanied by their respective price ranges:

Boiler Model

Price Range

Entry-Level Models

£650 - £1,000

Mid-Range Models

£900 - £2,500

Premium Models

Up to £4,500

Prices vary depending on factors like size and features. Smaller models are typically less costly, while larger ones warrant a higher price tag. Additionally, installation fees should be factored into the total cost. Installation can generally cost between £650 to £2,500, with fixed price options available at times. It's essential to consider that an electric combi boiler might be expensive to run compared to gas models, influencing the long-term financial commitment.

Maintenance and Longevity

Maintenance and longevity are pivotal to the performance and cost-effectiveness of electric combi boilers. Electric boilers are known for having fewer moving parts, which generally translates to less wear and tear over time.

Routine Maintenance Requirements

Electric combi boilers boast a simplified maintenance protocol due to their fewer moving parts compared to traditional gas boilers. Nevertheless, they require regular checks to ensure optimal performance. Key routine maintenance activities include:

  • Inspecting electrical connections for security and signs of corrosion.

  • Verifying the pressure levels and topping up if necessary.

  • Checking the functionality of the thermostat and other controls.

Boilers equipped with a stainless steel heat exchanger typically see less buildup of limescale and contaminants, which underlines the importance of selecting a combi boiler with this feature for reduced maintenance needs.

Longevity and Reliability of Electric Boilers

The lifespan of an electric boiler is often directly linked to its reliability. Manufacturers such as Thermaflow hint that their electric combi boilers might have double the lifespan of conventional gas boilers. This is partially due to the elimination of a combustion process that can introduce stress and decay in gas boilers.

  • Output rating and reliability are interlinked, with well-designed boilers maintaining their output efficiently over many years.

  • Boilers from respected brands tend to incorporate quality components like stainless steel heat exchangers, contributing significantly to their overall reliability.

The Verdict - Gas Or Electric Boilers

While both fuel types offer benefits for heating a home, there are contributing factors to consider. Electric boilers do provide a viable and efficient option, however despite low initial unit cost, may prove expensive to run long term and would not prove completely efficient in certain property types; this can include larger properties or homes with an instant, high hot water demand.

Gas heating, although initially a higher cost to install, is a more financially frugal option due to its relatively cheap running cost, also its capabilities of servicing a higher heating and hot water demand make it the most popular boiler fuel type. 

The abundance of gas powered heating systems is due to the well roundedness and applicable functionality of the fuel source, and thus may prove a better complete heating system fuel when taking into account the considerations discussed.

iHeat New Boiler Costs

Boilers can be a daunting purchase for many people as they’re an appliance with a lot of responsibility, providing heat for you and your family is something you want to get right. Boilers aren’t exactly a quickly disposable item either, potentially lasting you a decade.

Effectively, new boiler cost can be split into two segments: the first is the actual boiler itself (unit price), and the second is the cost of the boiler being installed (set up) in your property by an expert engineer. 

Here at iHeat, we want to remove all of this undue stress and make the decision making process of upgrading to a new central heating system, as easy as possible.

Boiler costs can vary depending on a number of factors including their brand, model, fuel, output, warranty, labour and installation type. Typically a new boiler will cost between £1,845 and £3,500, below is a list of average boiler installations offered by iHeat (guide only).

Installation Type

Price (inc VAT)

Combi to combi swap


Get a quote

System to combi conversion


Get a quote

New boiler install


Get a quote

Back boiler to a combi


Get a quote

System to system


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Frequently Asked Questions

Is an electric combi boiler worth it?

Electric combi boilers can be a worthwhile investment for households where gas supply is unavailable or for those seeking to reduce carbon emissions. Their efficiency and compact size make them a suitable choice for smaller homes and flats.

What are the disadvantages of an electric combi boiler?

One of the main disadvantages of electric combi boilers is their higher operational cost compared to gas boilers, largely due to the higher price of electricity. Additionally, they might not meet the hot water demand in larger homes with multiple bathrooms.

Can you get an electric only combi boiler?

Yes, electric only combi boilers are available and provide both heating and hot water without the need for a separate hot water storage tank. They are an efficient space-saving solution for homes without access to natural gas.

What is the most energy efficient combi boiler UK?

In terms of energy efficiency, electric combi boilers boast close to 100% efficiency rates as they do not waste energy through flue gas. The specific model that is most energy-efficient can vary yearly, so reviewing the latest expert recommendations is advisable.

Is an electric combi boiler cheaper to run?

While electric combi boilers are generally more expensive to run due to higher electricity costs, they can be cheaper if paired with off-peak electricity tariffs or renewable energy sources like solar panels.

Do combi boilers use a lot of electricity?

Combi boilers, when in operation, use electricity to heat water on demand. However, they use less electricity compared to traditional boilers with hot water tanks, as they only heat the water when needed, which means no energy is wasted in maintaining the temperature of a stored water supply.

Stephen Day profile photo
Article by
Stephen Day | Co-founder
Gas Safe registered and FGAS certified engineer with over 20 years experience in the heating and cooling industry.