Best Electric Combi Boiler

Understanding electric combi boilers

Electric combi boilers work much like gas versions, providing both heating and hot water on demand.

The main difference is that they use electricity instead of burning fuel, making them cleaner and more suitable for homes without a gas connection.

They’re compact, easy to install, and don’t need a flue or condensate pipe.

However, because electricity costs more per kWh than gas, running costs can be higher.

Choosing the right model helps balance performance and efficiency.

check out our in-depth guide to overall best electric boilers 2025!

Are electric combi boilers any good?

Modern electric combi boilers are reliable, quiet, and efficient, with no emissions at the point of use. They can be a great option for:

• Homes off the gas grid
  

• Flats or smaller properties with lower heating demand
  

• Households aiming for a lower carbon footprint
  

• Areas with modern insulation or solar energy setups

However, they might not suit large homes with multiple bathrooms, as their output is generally lower than that of gas boilers.

Average cost of an electric combi boiler in the UK

On average, electric combi boilers cost between £1,500 and £3,000, depending on size, brand, and features.

Installation adds another £500-£1,000, depending on the property.

While upfront prices can be similar to gas boilers, ongoing costs depend on energy use and tariffs.

Pairing an electric boiler with renewable electricity or solar PV can make it far more economical.

Running costs and energy efficiency

Electric boilers convert nearly 100% of the electricity they use into heat, so there’s no waste.

The challenge lies in electricity’s higher price per unit.

• Typical running cost: Around 30-35p per kWh in the UK (2025 average)
  

• Average annual cost for a 2-bed home: Around £1,800-£2,200
  

• Efficiency rating: Nearly 100%, compared to around 92-94% for gas models

To manage costs, use smart thermostats, off-peak tariffs, and insulation upgrades to retain heat.

Best electric combi boilers in the UK (2025)

The following models are among the highest-rated for reliability, performance, and value:

1. Fischer EB electric combi boiler

A premium option with advanced controls and stainless steel components, Fischer’s EB range is built for longevity.

• Output range: 9-36 kW
  

• Efficiency: 99%
  

• Best for: Larger homes or high water demand
  

• Average cost: £2,500-£3,000
  

2. Strom Electric Combi Boiler

Strom’s models are compact and modern, with easy-to-use digital controls and quiet operation.

They’re a popular choice for smaller homes.

• Output range: 11-24 kW
  

• Efficiency: 98%
  

• Best for: Flats and small-to-medium homes
  

• Average cost: £1,700-£2,400
  

3. Elnur Mattira MACC electric combi boiler

Elnur’s Mattira series includes built-in smart controls and weather compensation to optimise heating automatically.

• Output range: 6-15 kW
  

• Efficiency: 100%
  

• Best for: Apartments or homes with low to moderate demand
  

• Average cost: £1,800-£2,600
  

4. Heatrae Sadia Electromax

This model combines a boiler with a hot water cylinder, offering consistent water pressure and quick recovery times.

• Output range: 6-9 kW
  

• Efficiency: 99%
  

• Best for: Homes needing more stored hot water
  

• Average cost: £2,000-£2,800
  

5. Electric Heating Company (EHC) Comet Combi Boiler

The Comet is one of the most popular all-round electric boilers in the UK.

It includes a digital controller, energy-saving mode, and built-in heating timer.

• Output range: 9-14 kW
  

• Efficiency: 99%
  

• Best for: Small to medium-sized homes
  

• Average cost: £1,800-£2,400
  

6. Worcester Bosch Greenstar Electric Boiler

Although better known for gas boilers, Worcester Bosch also produces efficient electric options with the same build quality.

• Output range: 9-12 kW
  

• Efficiency: 99%
  

• Best for: Reliability and brand reputation
  

• Average cost: £2,200-£2,700
  

7. Vaillant Eloblock electric boiler

Vaillant’s Eloblock range delivers steady heat output with German engineering quality.

It’s designed to integrate easily with renewable systems.

• Output range: 6-24 kW
  

• Efficiency: 99%
  

• Best for: Homeowners with solar panels or heat pumps
  

• Average cost: £2,000-£2,600
  

Factors to consider before buying an electric combi boiler

Power output (kW rating)

Choose the correct output for your property size and water usage.

Too small and it won’t meet demand; too large and it wastes energy.

• 6-9 kW - Flats or 1-bed homes
  

• 10-15 kW - 2-3 bed homes
  

• 15 kW+ - Larger homes with higher demand
  

Hot water performance

Electric combi boilers deliver lower flow rates than gas models.

If your home has multiple bathrooms, consider a model with a small hot water storage tank.

Installation requirements

Electric boilers don’t need a flue, but they do need adequate electrical capacity.

Older properties may require a fuse board upgrade.

Energy tariffs and smart controls

Pairing with off-peak or smart tariffs can cut costs significantly.

Models with programmable thermostats and weather sensors improve efficiency further.

Maintenance and lifespan

Electric boilers have fewer moving parts and no combustion, so servicing is simpler and less frequent.

Annual safety checks are still recommended.

Advantages and disadvantages of electric combi boilers

How to get the most from your electric combi boiler

• Use a smart thermostat to schedule heating efficiently
  

• Insulate pipes and radiators to reduce heat loss
  

• Run radiators evenly to balance the system
  

• Monitor energy usage through your supplier’s app
  

• Book annual service checks to ensure reliability

Choosing the best electric combi boiler for your home

The best electric combi boiler for you depends on your home size, water demand, and budget.

For smaller homes, the Strom or EHC Comet are excellent choices.

For reliability and brand confidence, Vaillant, Fischer, and Worcester Bosch lead the way.

If you’re comparing options, iHeat also offers a wide range of efficient gas combi boilers with next-day installation across the UK.

When to consider alternatives

If your property has a gas supply, a high-efficiency gas combi boiler can still offer faster heating and lower running costs.

Electric boilers are ideal for smaller or off-grid homes, but always compare lifetime costs and your energy tariff before deciding.

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