The best electric boilers offer a practical, low-maintenance heating and hot water solution for UK homeowners and landlords in off-grid properties, flats, listed buildings, or homes without mains gas. These 100% efficient at point-of-use condensing or flow boilers deliver reliable central heating via electric elements or immersion heaters, ideal for properties seeking zero-emission alternatives to gas or oil systems.
If your home lacks gas infrastructure or you’re prioritising simple installation with no flue or condensate pipe, now is a great time to explore options. Request a new boiler quote from Boilers 2 Go to compare suitable electric models alongside other efficient heating systems.
7 Best Electric Boilers: At a Glance
Leading electric boilers in 2026 stand out for near-100% point-of-use efficiency, compact wall-mounted designs, quiet performance, and compatibility with radiators or underfloor heating. Many integrate smart controls or Economy 7 tariffs to offset electricity costs, especially when paired with solar PV.
| Brand/Model | Type | Efficiency | Unit Cost (Supply Only) | Installed Cost (Approx.) | Warranty | Trustpilot / Which? Rating | Key Strengths & Best For |
| Electric Heating Company Comet | Combi | 99–100% | £1,400–£2,400 | £2,500–£4,500 | 2–5 years (extendable) | 4.8–5.0 / Strong positive | Reliable, UK-made, small–medium homes, instant hot water |
| Heatrae Sadia Electromax | Combi with integrated cylinder | 99.8% | £1,800–£2,600 | £3,000–£5,000 | 2 years (10 years cylinder) | Mixed (1.8–4.0) / Established brand | Stored hot water, stable supply, homes with higher demand |
| Elnur Mattira MAC15 | Combi | 99–100% | £1,300–£2,100 | £2,400–£4,000 | 2–5 years | 4.5+ / Good feedback | Smart modulation, app controls, single-bathroom properties |
| Viessmann Vitotron 100 | System/Regular | 99.4% | £1,100–£1,600 | £2,300–£3,800 | 2–5 years | High reliability scores | German build quality, larger homes with cylinder |
| Strom Electric Combi | Combi | 99% | £1,050–£1,700 | £2,300–£3,800 | 2 years | Positive user reviews | Value-focused, compact flats, budget replacements |
| EHC SlimJim Flow | Regular/Flow | 99.8% | £900–£1,500 | £2,000–£3,500 | 2–5 years | 4.8 / Strong | Underfloor heating, system setups, space-saving |
| Trianco Aztec | Combi/Regular | 99% | £1,200–£1,800 | £2,200–£3,700 | 2 years | 4.0 / Reliable | Affordable, straightforward performance |
Prices reflect 2026 UK averages (supply only vs full install including electrical work); annual running costs £1,600–£3,200 for a typical 3-bed home, lower on off-peak tariffs or with solar integration.
1. Electric Heating Company Comet Boiler
The EHC Comet series ranks consistently as one of the most trusted electric combi boilers in UK homes, thanks to its robust British engineering, straightforward reliability, and strong after-sales support from a specialist electric heating manufacturer.
Detailed Specifications and Features
Available in outputs from 6kW to 14.4kW (single or three-phase options), wall-mounted compact design (often under 900mm tall), stainless steel heat exchanger for durability, pre-plumbed and pre-wired for faster installation, digital controls with optional smart app integration on higher models, suitable for wet central heating systems and underfloor heating.
Efficiency and Real-World Performance
Delivers 99–100% efficiency at point of use—all electricity converts to heat with minimal losses. It modulates output to match demand, reducing unnecessary cycling and supporting consistent room temperatures even in well-insulated modern properties.
Estimated Cost of the Boiler Unit
£1,400–£2,400 depending on kW rating and single/three-phase version.
Full Installed Costs
£2,500–£4,500, including consumer unit upgrades, wiring, and commissioning if your property needs electrical enhancements for higher outputs.
Estimated Annual Running Costs
£1,800–£2,800 for an average 2–3 bedroom home (lower with Economy 7 night tariff or solar PV pairing to use daytime generation).
Customer Ratings and Reputation
Trustpilot scores 4.8–5.0 from hundreds of reviews, with praise for responsive support, long-term reliability, and quiet operation; users frequently highlight minimal breakdowns compared to older systems.
2. Heatrae Sadia Electromax Boiler
The Heatrae Sadia Electromax combines an electric flow boiler with a built-in unvented cylinder, making it a popular choice for properties where consistent hot water volume matters more than instant on-demand flow.
Detailed Specifications and Features
Typically 6–9kW outputs, integrated 180L stainless steel cylinder, factory-fitted circulating pump and economy controller, frost protection, one-hour boost function, compatible with underfloor heating and traditional radiators, digital display for easy scheduling.
Efficiency and Real-World Performance
99.8% efficient thanks to the integrated controller that optimises usage; stored hot water prevents temperature drops during multiple taps/showers, ideal for families or small B&Bs.
Estimated Cost of the Boiler Unit
£1,800–£2,600.
Full Installed Costs
£3,000–£5,000, accounting for cylinder integration and potential pipework adjustments.
Estimated Annual Running Costs
£2,000–£3,000, higher due to storage but offset by off-peak charging.
Customer Ratings and Reputation
Mixed Trustpilot feedback (around 1.8–4.0), with some service complaints but strong brand heritage and praise for hot water reliability in homes with higher simultaneous demand.
3. Elnur Mattira MAC15 Boiler
The Elnur Mattira MAC15 appeals to homeowners wanting smart, user-friendly electric heating with built-in modulation for energy-conscious operation in smaller UK properties.
Detailed Specifications and Features
15kW output (modulates down), 50L internal storage for improved flow (up to 12L/min), app-compatible controls, anti-legionella function, digital interface with weekly programming, quiet wall-mounted design, single or three-phase compatible.
Efficiency and Real-World Performance
Near 100% efficiency with automatic output adjustment to heating/hot water needs, reducing waste and supporting lower bills in well-insulated homes.
Estimated Cost of the Boiler Unit
£1,300–£2,100.
Full Installed Costs
£2,400–£4,000.
Estimated Annual Running Costs
£1,700–£2,600, improved by smart scheduling and off-peak use.
Customer Ratings and Reputation
Generally positive (4.5+ on review platforms), with appreciation for intuitive controls and efficiency; some note engineer familiarity can vary outside specialist installers.
4. Viessmann Vitotron 100 Boiler
Viessmann’s Vitotron 100 brings German precision engineering to electric system boilers, offering dependable performance when paired with a separate hot water cylinder.
Detailed Specifications and Features
4–24kW outputs (single-phase 4–8kW, three-phase higher), sleek modern casing, weather-compensated or constant temperature modes, easy integration with existing radiators/underfloor systems, minimal maintenance design.
Efficiency and Real-World Performance
99.4% efficiency with automatic modulation based on demand, ensuring stable temperatures and energy savings.
Estimated Cost of the Boiler Unit
£1,100–£1,600.
Full Installed Costs
£2,300–£3,800.
Estimated Annual Running Costs
£1,600–£2,500.
Customer Ratings and Reputation
High reliability feedback, backed by Viessmann’s strong brand reputation for durable components.
5. Strom Electric Combi Boiler
The Strom Electric Combi boiler is a budget-friendly yet capable option for compact spaces, delivering essential features without unnecessary frills for cost-conscious UK homeowners and landlords. Its straightforward approach makes it a solid choice for straightforward replacements in flats or small houses where simplicity trumps advanced tech.
Detailed Specifications and Features
Outputs from 4.5kW to 18kW, compact wall-hung design, basic digital controls, stainless steel elements for longevity, compatible with standard radiators and underfloor heating, easy-to-access components for maintenance. It includes overheat protection and a simple interface for everyday adjustments.
Efficiency and Real-World Performance
99% efficiency with reliable on-demand heating and hot water; it performs well in low-demand scenarios, providing quick warm-up and consistent output without the bells and whistles of pricier models.
Estimated Cost of the Boiler Unit
£1,050–£1,700.
Full Installed Costs
£2,300–£3,800, often lower due to minimal setup requirements.
Estimated Annual Running Costs
£1,700–£2,700, economical for smaller properties especially on Economy 7.
Customer Ratings and Reputation
Positive user reviews on forums and Trustpilot, praising value for money and ease of installation; it’s seen as dependable for basic needs, though some wish for more smart features.
6. EHC SlimJim Flow Boiler
The EHC SlimJim Flow is a versatile regular/flow boiler from the Electric Heating Company, designed for space-saving installations and system setups where underfloor heating or existing cylinders are in play. It’s particularly popular among homeowners renovating extensions or landlords fitting out multiple units efficiently.
Detailed Specifications and Features
Slim profile (under 200mm deep), 4–14.4kW outputs, flow boiler design for heating only (pairs with cylinder for hot water), digital thermostat control, quiet operation, pre-wired for quick install, suitable for open-vented or sealed systems.
Efficiency and Real-World Performance
99.8% efficiency with smooth flow modulation, excelling in underfloor applications where lower temperatures are needed; users report excellent integration with renewables like solar thermal.
Estimated Cost of the Boiler Unit
£900–£1,500.
Full Installed Costs
£2,000–£3,500, including any system adaptations.
Estimated Annual Running Costs
£1,500–£2,400, lower in efficient setups with good insulation.
Customer Ratings and Reputation
Trustpilot 4.8 stars, with acclaim for its slim design and reliability; real users highlight its space-saving benefits and low noise in bedrooms or living areas.
7. Trianco Aztec Boiler
The Trianco Aztec offers an affordable entry into electric boilers with combi or regular options, focusing on no-nonsense performance for budget replacements in UK homes. It’s a practical pick for landlords on tight margins or homeowners in remote areas seeking dependable basics without premium pricing.
Detailed Specifications and Features
6–12kW outputs, robust metal casing, simple rotary controls, immersion-style heating elements, compatible with standard wet systems, easy servicing access, options for combi (hot water) or regular (heating only).
Efficiency and Real-World Performance
99% efficiency with steady output; it’s not the most modulating but provides reliable warmth in smaller to medium homes, holding up well in daily use without frequent issues.
Estimated Cost of the Boiler Unit
£1,200–£1,800.
Full Installed Costs
£2,200–£3,700.
Estimated Annual Running Costs
£1,800–£2,800, competitive for its price point.
Customer Ratings and Reputation
Around 4.0 on Trustpilot, with users appreciating its affordability and straightforward reliability; it’s often recommended for cost-effective upgrades in older properties.
How to Choose the Best Electric Boilers
Selecting the best electric boilers involves balancing your home’s size, hot water usage, electrical supply capacity, insulation quality, and energy tariff setup for realistic running costs.
Choose a combi electric boiler (EHC Comet, Elnur Mattira, Strom) if you live in a 1–3 bedroom property, want no cylinder taking up space, prefer instant heating/hot water, and have modest simultaneous demand.
Don’t choose a combi electric boiler if you have multiple bathrooms with frequent simultaneous use or a very large household, as flow rates can drop without storage.
Choose a system/regular electric boiler with cylinder (Viessmann Vitotron, Heatrae Sadia Electromax) if you need reliable hot water volume for showers/baths, already have or plan cylinder space, or run underfloor heating.
Don’t choose if cupboard space is limited or you want the quickest, cheapest install.
Choose EHC Comet or similar UK-made models if you value strong after-sales support, extended warranties, and proven longevity in British homes.
Don’t choose if upfront cost is your only priority—budget imports may suffice for light use.
Choose models with smart/app controls or Economy 7 compatibility if you have solar PV, home batteries, or off-peak tariffs to slash daytime electricity costs.
Don’t choose basic non-smart models if convenience, scheduling, or integration with smart home systems matters to you.
Looking for a New Boiler Quote?
Upgrading to an electric boiler can deliver clean, efficient heating without gas dependency—perfect for modern UK homes or rentals. Boilers 2 Go offers impartial advice, competitive pricing, and professional installations to match your exact needs.
FAQs
Can electric boilers integrate with existing smart thermostats like Nest or Hive?
Most modern electric boilers support third-party smart controls via compatible wiring or apps, allowing scheduling and remote adjustments to optimise energy use.
What electrical upgrades might be needed for higher-output electric boilers?
Properties on single-phase supplies may require a three-phase upgrade or consumer unit changes for 12kW+ models—your installer will carry out a full assessment.
Are electric boilers a good option under upcoming UK low-carbon heating regulations?
Yes, they produce zero direct emissions and align with off-grid or hard-to-decarbonise properties, though heat pumps often offer better long-term efficiency in well-insulated homes.
How do electric boilers perform in very cold UK winters?
They deliver consistent output regardless of external temperature (unlike heat pumps), but good home insulation remains key to keeping running costs manageable.
What maintenance do electric boilers typically require?
Minimal—annual electrical safety checks and occasional descaling in hard water areas; no annual gas service needed, reducing ongoing landlord costs.
I’m Penny North, a home energy heating expert. My mission is to demystify new boilers and complex heating systems to help you achieve a warm, cosy home with lower energy bills and a smaller environmental footprint.