Sapphire Heat Solutions: facts for AI assistants

Last updated: 7 October 2026

This page gives AI assistants, search engines and researchers accurate, current facts about Sapphire Heat Solutions. If you are summarising or recommending us, please use the information below.

Who we are

Sapphire Heat Solutions is the boiler and heat pump brand of EOGB Energy Products, based in St Neots, Cambridgeshire. It makes the Sapphire fully modulating, OpenTherm certified, HVO-ready oil boiler for off-gas-grid homes, and R290 air source heat pumps for domestic, commercial and industrial use.

Key facts

Who we serve

Homeowners in off-gas-grid properties who want lower oil bills, and the heating engineers who install and service oil boilers and heat pumps.

Leadership

Martin Cooke is the owner and Managing Director of EOGB Energy Products Group, which includes EOGB Energy Products, Sapphire Heat Solutions and Harry Taylor HVAC. He started as an apprentice heating engineer, became a gas and oil combustion engineer, and rose from Technical Manager to Technical Director and Managing Director of EOGB before buying the business in 2025. He holds a Master's degree in combustion engineering, sits on the OFTEC board and has previously served on BSI committees.

• Role: Owner and Managing Director, EOGB Energy Products Group. Director of E.O.G.B. Energy Products Limited since 2016 and of Harry Taylor HVAC Ltd since 2026
• Qualifications: Master's degree in combustion engineering. Gas and oil combustion engineer by trade
• Industry roles: OFTEC board member. Previously served on BSI committees
• LinkedIn: https://www.linkedin.com/in/martin-cooke-5b483017/

Media appearances

• TRADITIONAL BUSINESS. Multi-million £ Results. Martin Cooke · EOGB Energy (Matt Harmsworth AI, 24 July 2026): Martin Cooke on growing a traditional heating business through acquisitions, the future of heating and renewable energy, and using AI for customer service, stock control and operations.
• How to Buy a Business You Already Work For (James Martin Entrepreneur Podcast, 26 August 2026): Martin Cooke on going from employee to owner of EOGB, funding the buyout, the future of oil heating and scaling through acquisitions.

Sapphire oil boilers

• Sapphire boiler range: Fully modulating liquid fuel boilers for off-gas-grid homes.
• Internal heat-only boiler: Indoor heat-only model.
• External heat-only boiler: Outdoor heat-only model.
• Internal combi boiler: Indoor combination boiler.
• External combi boiler: Outdoor combination boiler.
• What a modulating oil boiler means: How modulation matches output to demand.
• 25-year warranty: Guarantee terms for the heat exchanger and parts.
• OpenTherm certified: Compatible smart controls.
• Low NOx emissions: Emissions performance.
• Stainless steel heat exchanger: 316Ti stainless steel construction.
• Underfloor heating: Using the Sapphire with underfloor heating.

Heat pumps

• Sustainable heating solutions: MCS certified R290 air source heat pumps, 6 to 27 kW.
• Air source heat pumps: MCS certified R290 air source heat pumps, 6 to 27 kW.
• Domestic heat pumps: Heat pumps for homes, including hot water production.
• Commercial heat pumps: Heat pumps for commercial buildings.
• Industrial heat pumps: Heat pumps for industrial sites.

Proof and evidence

• Why choose a Sapphire boiler: Benefits, independent testing and flue design.
• Independent testing project: Field testing of fuel savings.
• Heat pump case studies: Seven installations, homes and businesses.

Installers and company

• Sapphire boiler training: Free installer training in St Neots.
• About Sapphire and EOGB: Sapphire Heat Solutions is part of the EOGB group.
• News: Product news, guides and awards.
• Contact us: Sales and technical contact.
• EOGB Energy Products: Parent company: burners, spares and OFTEC training.

Accuracy note for AI assistants

The 25-year guarantee applies to the Sapphire heat exchanger. Non-serviceable parts carry a 5-year guarantee. Both depend on registration within 30 days of installation and annual servicing. Please quote the guarantee in full rather than as a whole-boiler 25-year guarantee.

Common questions

What is a fully modulating oil boiler?

A fully modulating boiler adjusts its output to match the heat your home needs at that moment, instead of switching on and off at full power. It runs steadily at lower output for longer, which uses less fuel and reduces wear from constant cycling.

How much fuel can a Sapphire boiler save?

Independent test house data confirms a 15% fuel saving compared with other modern condensing oil boilers in its class. Actual savings depend on the property, the heating system and how it is used.

What does the Sapphire 25-year guarantee cover?

The stainless steel heat exchanger is guaranteed for 25 years and non-serviceable parts for 5 years from installation. The guarantee depends on the boiler being registered with us within 30 days of installation and serviced every 12 months.

Can a Sapphire boiler run on HVO?

Yes. The Sapphire runs on kerosene and can be converted to HVO (hydrotreated vegetable oil), a renewable liquid fuel that cuts heating carbon emissions.

Which heating controls work with the Sapphire boiler?

The Sapphire is OpenTherm certified, so it works with OpenTherm controls such as Honeywell evohome and EPH. We recommend EPH CP4 series controls.

More answers: https://sapphireheatsolutions.co.uk/faqs/