Case study
Helping The Guinness Partnership Reduce Fuel Poverty with EndoTherm
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ServicesHeating System Efficiency
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ClientThe Guinness Partnership
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Date01.04.2026
Housing providers are under increasing pressure to improve the energy efficiency of existing homes, reduce carbon emissions and, most importantly, support residents facing rising energy costs.
While large-scale retrofit programmes remain essential, there is also growing demand for practical, low-disruption solutions that deliver immediate benefits without requiring major investment or changes to residents' homes.
That's exactly why Sureserve partnered with The Guinness Partnership to deliver EndoTherm as part of planned maintenance visits, helping residents reduce heating costs while supporting Guinness' wider sustainability ambitions.
What is EndoTherm?
EndoTherm is a proven, water-based energy-saving additive designed for wet central heating systems. Rather than replacing boilers or radiators, it is simply added to the existing heating system where it improves heat transfer, allowing radiators to warm more quickly and boilers or heat pumps to work less intensively.
The result is a more efficient heating system that can reduce energy consumption, lower heating bills and cut carbon emissions—all without changing the way residents use their heating.
Independent testing has demonstrated that EndoTherm can improve heating system efficiency by up to 15%, with typical household bills savings of £110-£170 per year and emissions savings of 200-500kgCO2e per year. The product lasts for 10 years or more meaning benefits will be achieved year after year.
Why Housing Providers Choose EndoTherm
For landlords looking to improve existing homes, EndoTherm offers several significant advantages.
Unlike many energy efficiency measures, installation is quick and non-disruptive, typically taking just a few minutes during an existing maintenance visit with no system downtime.
The product has been independently tested and is:
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Proven to improve heating efficiency by up to 15%.
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Compatible with existing boilers, heat pumps and wet heating systems, with no equipment replacement required.
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Compatible with leading corrosion inhibitors and proven to be non-corrosive to heating system components.
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Safe to use, non-hazardous and requiring no special disposal arrangements.
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The product has also been rigorously assessed by independent laboratories and recognised testing organisations, providing clients with confidence that reported savings are evidence-based rather than theoretical.
The Guinness Partnership: Delivering Measurable Results
The Guinness Partnership is one of England's largest housing associations, providing homes to around 140,000 customers across approximately 70,000 properties. As part of its commitment to tackling fuel poverty and improving the energy performance of its housing stock, Guinness partnered with Sureserve to incorporate EndoTherm installations into planned maintenance visits, targeting homes where residents could benefit most.
By integrating installation into existing maintenance visits, the programme delivered immediate energy efficiency improvements without creating additional appointments or disruption for residents.
The project delivered a range of measurable benefits, including:
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Average energy savings of around 14% per property.
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Typical annual heating bill savings of £140–£170 for each household with projected savings of £1,400-1,700 per home over the products expected lifetime.
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Approximately 441kg CO₂e saved per property each year, supporting Guinness' wider decarbonisation ambitions.
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No additional disruption for residents, as EndoTherm was installed during existing planned maintenance visits.
For households experiencing fuel poverty, these savings can make a meaningful difference, helping reduce the fuel poverty gap between household income and essential energy costs by around 40% while improving comfort throughout the year.
Sureserve's new EndoTherm Social Value Scheme
Following the success of programmes such as The Guinness Partnership, Sureserve is now making EndoTherm available free of charge on selected contracts as part of our wider Social Value offering. Eligible housing providers can use EndoTherm to:
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Reduce fuel poverty.
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Lower residents' energy bills.
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Improve heating system efficiency.
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Reduce carbon emissions.
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Deliver measurable social value outcomes alongside everyday maintenance activity.
Availability is dependent on contract scope and programme eligibility. If you would like to explore whether EndoTherm could benefit your residents, please speak to your local Sureserve representative. Together, we can help deliver warmer homes, lower bills and a more sustainable future.
