Heat-as-a-Service

Transition away from fossil-fuelled heating with a leased Heat Pump.

Upgrade to a Heat Pump without the financial barrier.

Our Heat-as-a-Service solution makes decarbonisation easy by giving you access to a Heat Pump with no up-front costs – just a monthly fee. Heat Pumps can provide heating from 40°C up to 165°C and reduce your carbon emissions by up to 66%, compared to a gas boiler. With our solution, you immediately access more efficient heating, while spreading costs over a term of 7-15 years.

  • Lower energy costs

  • More efficient heating

  • Reduce your carbon footprint

  • Protect your capital

How does it work?

With our Heat-as-a-Service solution you benefit from a future-proofed heating upgrade, while holding on to your capital, by leasing a Heat Pump with a monthly payment.

We offer a choice of five Heat Pump technologies to suit different budget and site requirements. Choose from

  • Air-source
  • Ground-source
  • Water-source
  • Waste heat-source
  • Cascade

With our approved partners, we’re making decarbonisation easy. You get all the benefits of advanced energy technology without the burden of managing it. We’ll keep your system running efficiently and reliably, so you can focus on your priorities.

Our service includes

  • Ongoing preventative maintenance
  • Fast repairs if issues arise
  • Continuous remote monitoring

Choose from three different finance options, including a fixed monthly fee, a set p/kWh, or a combination of the two.

Key features and benefits

Future-proof your site

Get a head start on low-carbon heating before gas boilers are phased out entirely, with a cost-effective upgrade that allows you to benefit immediately.

Protect your capital

With a range of flexible funding options, decarbonisation is made easy – without any upfront investment. Choose from a fixed monthly fee, a set p/kWh, or a combination of the two, freeing up your reserves for other priorities.

Comprehensive maintenance cover

Enjoy peace of mind with a regular schedule of preventative maintenance to reduce the risk of faults and outages, rapid repairs should a fault occur, and remote performance monitoring for ongoing efficiency.

Lower energy costs

Heat Pumps can provide heating from 40°C up to 165°C, improving the energy efficiency of your buildings. 

Accelerate decarbonisation and net zero goals

Heat Pumps can reduce your carbon emissions by up to 66%, compared to a gas boiler. This will improve as renewables on the grid grow, reducing their carbon impact further.

Go carbon-neutral

Your system can be considered carbon neutral if Solar PV is used to power the Heat Pump.

A structured approach to project success

Quality built in from design to delivery

From initial concept through to long-term performance, our end-to-end approach ensures quality, compliance, and efficiency at every stage of your project. By combining technical expertise with a structured delivery process, we help you reduce risk, maximise performance, and make confident investment decisions, all while ensuring a smooth and seamless experience from start to finish.

Feasibility

Gain a strategic overview of your opportunities. The journey begins with a pre-project kick off meeting to determine objectives and outputs. We review scope, assess site infrastructure and energy data. Using dynamic simulation, we identify optimal options and recommend system sizing. We’ll estimate costs, carbon savings, payback period, and forecast lifetime emissions reductions to support confident, informed investment decisions.

Kickstart your project with a compliant, high-performance system design. We develop a fully integrated design that is compliant with safety, performance, and regulatory standards. Detailed technical drawings, specifications, and engineering calculations ensure a robust, installation-ready design package that optimises system performance.

Achieve a seamless installation with expert support at every step. We support construction to ensure your design is delivered correctly, coordinating with contractors, attending site meetings, and resolving technical issues. We conduct inspections, testing, and verification of systems. We’ll provide inspection reports and ensure that the installation meets design specifications, regulatory requirements, and expected performance standards for safe, reliable operation.

We compile all project documentation, including operation and maintenance manuals, and issue required certifications confirming compliance. We’ll conduct a final inspection to verify completion and ensure all aspects are finalised before handover. We’ll deliver a complete handover package containing manuals, certifications, and a detailed final inspection report for ongoing operation and maintenance.

Unlock peak energy efficiency. With comprehensive maintenance included to limit the risk of faults and outages, rapid repairs should a fault occur, and remote performance monitoring, you’ll gain peace of mind. Your operations will run smoothly, with no costly downtime, the lifespan of your equipment will be extended, and you’ll enjoy optimised performance.

Fund your system with ease. Our capex-free, fully financed solutions offer a choice of funding options, including a fixed monthly fee, a set p/kWh, or a combination of the two. You’ll gain access to renewable energy and low carbon technology while protecting your capital.

Frequently Asked Questions

Heat-as-a-Service is a fully managed solution that allows you to upgrade to a low-carbon heat pump system without upfront capital investment. Instead, you pay a predictable monthly fee while accessing all the benefits, such as more efficient heating, lower costs and a reduced carbon footprint.

With Heat-as-a-Service, you avoid large upfront costs and ongoing maintenance responsibilities. We retain responsibility for performance, servicing, and monitoring, allowing you to focus on your core operations while benefiting from efficient, low-carbon heating.

Your monthly fee typically covers system design, installation, financing, preventative maintenance, repairs, and continuous performance monitoring. Pricing structures can include a fixed fee, a usage-based (p/kWh) model, or a hybrid approach.

 

No, our solution is designed to remove financial barriers. You can upgrade your heating system with zero upfront investment.

Contracts typically range from 7 to 15 years, depending on your site requirements, chosen technology, and financing structure.

We offer a range of technologies tailored to your site, including air-source, ground-source, water-source, waste heat, and cascade systems.

Yes, modern heat pumps can deliver temperatures from 40°C up to 165°C, making them suitable for a wide range of commercial and industrial applications.

Savings depend on your current system, energy usage, and site conditions. However, heat pumps are significantly more efficient than gas boilers, which can lead to meaningful reductions in energy costs over time.

Heat pumps can reduce carbon emissions by up to 66% compared to traditional gas boilers. This reduction will continue to improve as the electricity grid becomes greener.

We provide fast-response repair services as part of the agreement. Our remote monitoring systems often detect issues early, allowing us to resolve problems before they impact your operations.

We carefully plan and manage installation to minimise disruption. Our project management team coordinates closely with your site to ensure a smooth and efficient process.

The service includes ongoing preventative maintenance, system optimisation, and repairs, ensuring reliable and efficient performance throughout the contract.

Yes, our feasibility and design stages ensure the system is tailored to your existing infrastructure and operational needs.

Yes, Heat-as-a-Service helps you transition away from fossil fuels ahead of regulatory changes, ensuring compliance with evolving energy standards and supporting long-term sustainability goals.

Yes, pairing your heat pump with solar PV can significantly reduce operating costs and may enable carbon-neutral operation.

Options typically include extending the agreement, upgrading the system, or transferring ownership, depending on your contract terms.

How do I get started?

Simply contact us for a no-obligation discussion. We’ll begin with a feasibility assessment to evaluate your site, identify the best solution, and outline costs, savings, and carbon reduction potential.

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Customer success stories

Our experience

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Annual saving of £61,000+ and immediate ROI from TM44 A/C Inspection.

Discover how a global data centre accessed major operational savings and maintained compliance.

Saving from cleaning the chillers
£
40,000+
Saving from adjusting the schedules
£
21,000+
Saving from upgrading the chillers
£
337,000+

A transport transformation: How TfGM is driving Greater Manchester's carbon neutral future.

Discover how our partnership helped Transport for Greater Manchester accelerate toward their 2038 net zero target.

Total saving
£
170,000
Carbon dioxide reductions
410
tCO2e
Solar PV solutions
510,000
kWh

Annual carbon emissions reductions of 129 tCO₂e for Royal Brompton and Harefield Clinical Group.

Zenergi has partnered with Royal Brompton and Harefield Clinical Group for many years and is actively supporting their journey to net zero.

Annual carbon savings
129
tCO2e
Annual cost saving
£
38,000

Connexus: lowering bills for housing development residents.

Discover how Zenergi helped reduce heating bills for residents of the award-winning Rocks Green shared ownership development.

Harry Eaves

Senior Energy Consultant

Zenergi

Discover how our energy audits highlighted £94,955 of annual savings for Aldermore Bank.

We’re helping Aldermore Bank to reduce carbon emissions and cut costs – all while keeping the bank’s net zero strategy firmly on track.

Total carbon saving
172.6
tCO2e
Total annual cost saving
£
94,955

Greener transport: helping Gregory Group meet ambitious goals.

A science-led partnership with one of the UK’s largest transport groups that led to impressive net zero acceleration.

Harry Eaves

Senior Energy Consultant

Zenergi

Halving Glenmorangie’s energy costs through strategic building optimisation.

Discover how our partnership helped a whisky giant transform their facility’s energy efficiency with targeted solutions.

Estimated annual electricity consumption savings
59
%
Estimated annual gas consumption savings
52
%
Estimated annual overall energy savings
55
%

How Climate Change Agreements motivated Koito Europe Ltd to save over £100,000 annually.

Discover how our partnership approach to Climate Change Agreement management delivers sustained savings for this leading vehicle lamp manufacturer.

John Netherwood

Chief Operations Officer

Zenergi

Partnering with PR Associates to drive compliance and energy efficiency in schools.

We’re helping to ensure over 100 schools have the confidence to focus on their priorities – all while remaining compliant and optimising efficiency.

Simon Watts

Partnerships Manager

Zenergi

Zenergi’s siteworks expertise delivers Manchester’s major tram extension on time.

Zenergi's siteworks expertise delivers Manchester's major tram extension on time.

John Netherwood

Chief Operations Officer

Zenergi

Keeping energy costs under control for MK2 Real Estate

Discover how strategic procurement and ongoing oversight supports a growing property portfolio.

Mark Leonard

Strategic Client Partner

Zenergi

Uncovering potential energy savings of 26% for East Sussex County Council

Discover how we identified potential annual savings of more than £52,000 for a progressive Local Authority with ambitious net zero targets

Identified energy savings
1,042,371 kWh
Identified cost savings
£52,567
Identified carbon savings
194
tCO2e

ESOS audit identifies £4 million in cost savings.

Explore how our ESOS Phase 3 audit uncovered a 5% energy reduction and a two-year ROI for a FTSE 250 food and drink manufacturer.

Energy reduction
33,093 MWh
Cost savings
£4.1 million
Carbon reduction
6,219
tCO2e

Unlocking £5 million in savings with ESOS compliance

How a global renewable energy leader turned ESOS into a strategic opportunity for efficiency and sustainability.

Energy savings
26,000,000 kWh
Carbon reduction
8,300 tCO₂e
Cost savings
£4.91 million

Powering a historic dining hall for St John’s School.

Our Siteworks team streamlined a complex meter installation to meet ambitious timescales and ensure a new dining hall opened on time.

Karina Joshi

Strategic Customer Success Manager

St John's School Customer Success Manager

Bill Validation case study for independent school

How one conversation led to a £107,000 refund for a leading independent boarding school

Billy Pryke

Strategic Customer Success Manager

How our energy audit identified savings of £50,000 for E-ACT.

Discover how our exciting new programme for Multi-Academy Trust, E-ACT, identified huge carbon and cost savings in just six months.

Identified energy savings
246,193
kWh
Identified carbon savings
48.16
tCO2e
Identified cost savings
£
50,114
How we helped Danes Educational Trust unlock £166,000 for carbon reduction.

How we helped Danes Educational Trust secure £166,000 for carbon reduction.

Phase 2 LCSF grant awarded
£
39,000

Leigh Academies Trust saves £500,000+ through flexible energy purchasing.

Discover how a 10+ year partnership helped one of the country’s largest and most established Multi-Academy Trusts navigate a turbulent energy market

Achieved savings: Year one
£
399,311
Forecast savings: Year two
£
200,287
Forecast savings: Year three
£
43,511

Shropshire Council: Enabling compliance for over 10 years.

We’re helping Shropshire Council to achieve compliance through Display Energy Certificates and progressively reduce its environmental footprint. Zenergi is also enabling targeted energy reduction in key buildings.

Darren Myers

Carbon Compliance Manager

Zenergi

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