New report shares tepeo’s progress across governance, workers, community, environment and customers as it continues its mission to accelerate low-carbon heating
tepeo has published its first B Corp Impact Report, setting out the company’s progress since becoming B Corp certified and outlining how it plans to grow responsibly while helping more homes move away from fossil fuel heating.
The 2025 Impact Report covers tepeo’s work across the five B Corp impact areas: governance, workers, community, environment and customers. It also shares tepeo’s verified B Corp score, progress over the past year, and goals for the year ahead.
For tepeo, B Corp certification is more than a badge. It is a public commitment to building a business that is fair, transparent and aligned with its purpose: accelerating the transition to low-carbon heating and helping every home play its part in a cleaner, more flexible energy system.
A milestone for responsible low-carbon heating
tepeo became B Corp certified in 2024 with an Impact Assessment score of 97.8. The company is aiming to increase this to at least 110 at its next recertification, reflecting its ambition to keep improving as it grows.
The report also states that tepeo is the first domestic heating manufacturer to achieve B Corp certification, setting a precedent for the heating industry.
That matters because decarbonising home heating is not only a technology challenge. It is also a question of trust, transparency and accountability. Homeowners, installers, partners and investors need confidence that the companies building the future of heating are doing so responsibly.
As the report explains, tepeo’s approach is rooted in the belief that heating needs to be reimagined not just technically, but as a force for social and environmental good.
Building a better boiler business
tepeo’s flagship product, the ZEB, is a compact heat battery boiler designed to replace a traditional boiler with minimal disruption. It charges using low-carbon and low-cost electricity, typically when demand is low or renewable generation is high, then releases heat when needed. The report describes this as giving households the same comfort as a fossil-fuel boiler, but with far lower emissions.
Over the past year, tepeo improved the ZEB’s performance, prepared for manufacturing scale-up, deepened engagement with installers, customers and policymakers, and helped develop new industry standards for thermal storage.
This reflects tepeo’s wider mission: to make low-carbon heating more affordable, scalable and equitable, while enabling homes to play an active role in a cleaner, more flexible energy system.
What the report covers
The 2025 B Corp Impact Report gives a transparent view of what tepeo said it would do, what it has done, and what comes next.
Key highlights include:
Governance
tepeo published new content explaining the environmental benefits of the ZEB and improved its cost and carbon calculator, helping households better understand the potential environmental and financial benefits of adopting the ZEB.
Looking ahead, tepeo plans to implement carbon-reduction targets and continue expanding publicly available information on the environmental impact of both tepeo and the ZEB, including improved modelling and real-world data.
Workers
tepeo achieved an employee engagement score of 90%, maintaining strong satisfaction and commitment despite a challenging external backdrop. The company also granted additional share options to all staff, helping ensure employees participate in tepeo’s long-term value creation.
Next year, tepeo plans to review pension contributions, explore indoor environmental quality monitoring at its manufacturing facilities, and assess opportunities for internships, apprenticeships or technical training programmes as manufacturing capability grows.
Community
tepeo worked with industry partners and policymakers to help develop the new MCS standard for thermal storage. As part of the working group, tepeo helped shape rules to ensure heat batteries store enough energy to charge during low-carbon periods, supporting real emissions reductions.
The company also organised volunteering opportunities with a local organisation that draughtproofs homes to help residents save energy and reduce bills.
Environment
tepeo implemented environmentally preferable purchasing policies for product input materials, strengthening how it assesses environmental performance across its supply chain. It also explored options for transitioning service, support and delivery vehicles to electric alternatives, with further review planned as existing leases expire.
Future environmental goals include reducing the volume of materials used in the ZEB, improving water management across the product lifecycle, and giving customers the option to offset the carbon associated with ZEB production.
Customers
tepeo increased customer satisfaction to 92%, supported by improvements to self-service support, customer-service responsiveness, and product pain points. The company also achieved Cyber Essentials Plus certification, demonstrating its commitment to data protection and secure system management.
The report also highlights app improvements shaped by customer feedback and increased direct engagement through tepeo’s customer forum.
Raising standards for heat battery boilers
A key part of the report focuses on tepeo’s contribution to raising industry standards for thermal storage.
As heat battery boilers become a more important part of the low-carbon heating mix, clear standards are essential for consumer confidence, installer guidance and product quality. In 2024–25, tepeo contributed to the Microgeneration Certification Scheme’s first design and installation standard for Thermal Energy Storage Systems.
Using engineering expertise and anonymised real-world data from its fleet, tepeo provided evidence to show how storage capacity affects carbon impact. The report says this helped shape strong requirements within the new standard, supporting certified systems that genuinely reduce emissions.
For homeowners, this means greater confidence. For installers, it means clearer guidance. For the industry, it helps create a consistent baseline as thermal storage scales.
Why B Corp matters for tepeo
The heating sector is changing quickly. Customers want warm, reliable homes, but they also want to make choices that are better for the planet. Housing providers, developers and partners increasingly need suppliers who can demonstrate environmental and social responsibility.
B Corp certification helps show that tepeo’s innovation is backed by rigorous governance and a commitment to positive impact. The 2026 marketing strategy identifies B Corp as a significant credibility asset for tepeo, especially for eco-conscious homeowners and B2B organisations with ESG priorities. This report does exactly that. It gives customers, installers, partners and investors a clearer view of how tepeo is working to grow responsibly while supporting the transition away from fossil fuel heating.
Read the full report
tepeo’s first B Corp Impact Report is a transparent look at what the company has achieved, where progress has been harder, and what it plans to do next.
As tepeo grows, the company will continue developing its technology, supporting stronger industry standards, improving customer experience and building a business that creates value for people and the planet.