Luthmore secures £5.5m funding to scale zero-emission boiler rollout
A UK clean-technology business developing battery-powered electric boilers has raised £4.5 million to bring its first commercial product to market. Luthmore, based in Chippenham, aims to offer a zero-emission alternative to gas combi boilers for homes where heat pumps are difficult or expensive to install. The funding marks a shift from product development to commercial deployment at a time when the UK housing sector faces new regulatory pressure to cut carbon emissions from heating.
The investment reflects growing interest in technologies that can decarbonise heating without the disruption often associated with heat pump installation. For many UK businesses, particularly those in construction, property management and social housing, the challenge is not whether to move away from gas heating but how to do so in a way that works across diverse building types. Luthmore's proposition is aimed squarely at that challenge.
The company later secured a further £5.5 million in an oversubscribed funding round. This included £1 million from the British Business Bank's South West Investment Fund, managed by The FSE Group. Since its founding in 2022, Luthmore has raised £12.4 million in total. The investor base includes housing developers, residential management companies, plumbing businesses and high-net-worth individuals. That mix indicates a focus on adoption through commercial channels rather than direct consumer sales.
Battery-enabled electric heating as a direct boiler replacement
Luthmore One is designed to fit in the same wall-mounted space as a traditional gas combi boiler. The system uses six lithium iron phosphate batteries to deliver up to 30kW of hot water capacity and up to 10kW for central heating. Unlike gas boilers, it produces no direct emissions at the point of use. Its overall carbon performance depends on the electricity used to charge and operate it, as well as manufacturing and lifecycle impacts.
The product is intended to reduce installation complexity compared with heat pumps. It does not require outdoor space for a ground source or air source unit. There is no need for a separate hot water cylinder. According to investor information, the system can operate without radiator upgrades. This reduces both cost and disruption, particularly in smaller homes, flats and older properties with limited external space.
Heat pumps remain the primary technology in UK decarbonisation plans for building heat. However, they are not suitable for every property without significant additional work. Installation can require outdoor space, upgraded radiators, improved insulation, changes to hot water arrangements or alterations to electrical infrastructure. Luthmore's strategy is to target properties where those requirements make heat pumps impractical or uneconomic.
This does not make electric boilers equivalent to heat pumps in energy efficiency. Heat pumps typically deliver more heat per unit of electricity because they transfer heat from the surrounding environment rather than generating it directly. Luthmore's potential advantage lies in installation simplicity, rapid hot water delivery and suitability for buildings where structural or spatial constraints rule out other low-carbon options.
Regulatory pressure and the Future Homes Standard
The investment arrives as the UK prepares for tighter standards on the energy performance of new homes. The Future Homes Standard, expected to take effect in 2026, will require new builds to produce significantly lower carbon emissions. Luthmore's backers have identified this policy shift as an important driver for low-carbon heating technologies.
The regulatory environment is creating opportunities for multiple heating solutions. Nevertheless, it also raises questions about performance, running costs and system-level electricity demand. A zero-emission boiler can eliminate on-site combustion. However, household emissions and costs will depend on electricity prices, grid carbon intensity, tariffs, insulation quality and how efficiently the system is operated.
For businesses managing housing stock, the policy backdrop means decisions about heating systems are increasingly tied to compliance risk. Social landlords, housing associations and developers face growing pressure to demonstrate how they will meet emissions targets. Technologies that can be deployed quickly and without extensive retrofit work are therefore gaining attention.
Luthmore's approach may be most relevant to specific segments of the housing stock rather than as a universal replacement. Smaller properties, flats, older homes with limited external space and buildings where extensive retrofit work is uneconomic could represent the core market. Consequently, the technology sits alongside heat pumps rather than replacing them in all cases.
How the funding will support commercial rollout
The £4.5 million raise is intended to fund production, staffing, product development and market expansion. The subsequent £5.5 million round, which included the British Business Bank investment, will support scaling production and accelerating market entry. Ralph Singleton, head of equity for the South West at The FSE Group, pointed to Luthmore's patent portfolio, early relationships with developers and installers, and planned manufacturing scale as reasons for the investment.
Luthmore later appointed Hervé Dehareng, a former Dyson senior innovation director, as chief executive. The appointment accompanied the larger funding round and an expansion plan focused on production, product development and installer-led distribution. Dehareng said the scale of investment reflected demand for solutions suited to the diversity of the UK housing stock.
The route to market emphasises partnerships with developers, housing providers and trained installation partners. This approach reflects the reality that large-scale adoption depends on building relationships across the supply chain. Installers need training on the new technology. Developers need confidence in product performance and regulatory compliance. Housing associations need reassurance on running costs and maintenance.
For businesses involved in housing development or property management, the commercial rollout of technologies like Luthmore One represents both an opportunity and a challenge. The opportunity lies in access to low-carbon heating solutions that can be deployed without major retrofit work. The challenge is assessing whether the technology delivers on its performance claims and offers genuine cost advantages over existing alternatives.
Cost, performance and grid impact considerations
Several factors will determine whether Luthmore One succeeds commercially. Installation economics matter. The system must offer a compelling total cost once equipment, installation and any electrical upgrades are included. Running costs are equally important. Direct electric heating can be expensive compared with gas unless offset by tariffs, battery management, efficiency improvements or falling renewable electricity costs.
Grid impact is another consideration. Widespread adoption could increase electricity demand during peak heating periods. This raises questions about network capacity and the timing of electricity use. Battery storage within the unit may help manage demand, but the overall effect will depend on how many units are deployed and how they are operated.
Product durability will influence long-term consumer confidence. Battery life, replacement costs, safety and end-of-life recycling are all important. Installer capacity also matters. Commercial rollout requires sufficient numbers of trained engineers and reliable after-sales support. Building standards, product certification and future energy efficiency rules will determine where the technology can be deployed.
For SMEs working in construction, property management or facilities management, these considerations are practical rather than theoretical. A heating system that looks promising on paper must also perform reliably in service, meet regulatory requirements and deliver acceptable running costs. Businesses will need to weigh the benefits of simpler installation against the potential for higher electricity bills.
Summary of key details
- Luthmore, a Chippenham-based clean-technology company founded in 2022, has raised £4.5 million to support the commercial rollout of its Luthmore One electric boiler.
- A subsequent £5.5 million funding round, described as oversubscribed, included £1 million from the British Business Bank's South West Investment Fund.
- The Luthmore One system uses six lithium iron phosphate batteries and delivers up to 30kW for hot water and 10kW for central heating without burning gas.
- The product is designed to fit in the same space as a gas combi boiler and operate without radiator upgrades, reducing installation disruption.
- Investors include housing developers, residential management companies, plumbing businesses and high-net-worth individuals, reflecting a focus on commercial adoption channels.
- Luthmore has raised £12.4 million in total since its founding and appointed Hervé Dehareng, a former Dyson senior innovation director, as chief executive.
- The technology is positioned as a solution for properties where heat pumps are impractical due to space constraints, structural limitations or installation costs.
- Success will depend on installation economics, running costs, grid impact, product durability, installer capacity and regulatory approval.
What this means for housing and construction businesses
The investment in Luthmore is significant because it supports a technology designed to address one of the most difficult parts of the UK's heat transition challenge. Decarbonising properties that cannot readily adopt a heat pump requires practical alternatives. For businesses managing housing stock, the availability of such alternatives reduces the risk of being unable to meet emissions targets.
However, the technology is not a universal solution. It must prove itself in real-world conditions. Installation must be straightforward and cost-effective. Running costs must be acceptable to tenants and homeowners. The system must perform reliably over its expected lifespan. Businesses considering this technology will need to evaluate it against their specific portfolio of properties and their compliance obligations.
For developers, the appeal lies in the potential to meet the Future Homes Standard without the complexity of heat pump installation across every property type. For housing associations and social landlords, the interest is in technologies that can be deployed at scale without causing disruption to tenants. For heating installers, the opportunity is in training on new systems and expanding service offerings beyond gas boilers.
The investment does not establish that Luthmore One is cheaper or more efficient than a heat pump in every application. It does, however, indicate growing investor interest in a broader portfolio of low-carbon heating solutions. If Luthmore can demonstrate dependable performance, manageable running costs and straightforward installation, its product could occupy a niche between conventional gas boilers and more complex heat pump retrofits.
That niche may be valuable for the UK's heating transition. No single technology will suit every building. Practical alternatives are needed to reduce reliance on gas across the country's varied housing stock. For SMEs, this means keeping track of emerging technologies while continuing to focus on compliance, cost control and risk management.
Businesses involved in sustainable procurement for housing and construction will need to assess new heating technologies as they come to market. Those working on carbon reporting and net zero compliance should consider how heating choices affect emissions profiles and regulatory obligations. The arrival of new products like Luthmore One is part of a wider shift in how the UK housing sector approaches decarbonisation.
Where to find further information
The British Business Bank provides information on its regional investment funds, including the South West Investment Fund, on its official website. Details on the Future Homes Standard and related building regulations are available from the Department for Energy Security and Net Zero. Guidance on heat pump installation and low-carbon heating options is published by the UK government.
For businesses seeking advice on decarbonising building heat, the Chartered Institution of Building Services Engineers offers technical guidance and standards. The Office of Gas and Electricity Markets publishes information on energy tariffs and grid capacity. These resources provide authoritative context for evaluating new heating technologies and understanding their role in the wider transition to net zero.