Green Heat - About Us

Green Heat Ltd was established by the proprietor, Peter Thom, in 1990 with the specific purpose of raising awareness of energy efficiency for the long term benefit of householders and the importance for future generations of conserving the Earth's resources. Green Heat is now one of the country's leading energy efficiency companies, being at the forefront of the development of Green Home Energy Audits and has pioneered the promotion and the concept of energy efficient housing and affordable warmth. The Audit provides valuable information to the home owner on a range of cost effective improvements to reduce running costs and improve comfort conditions and includes an Energy Performance Certificate (EPC). The EPC is valid for 10 years and is a requirement for all homes that are rented or sold. The Green Home Energy Audit will also provide information and access to Government Initiatives including The Green Deal, The Renewable Heat Incentive (RHI) and Feed In Tariffs (FITs).

There are many energy saving options and solutions on the market and there is much misleading information on the performance and suitability of these products. Green Heat provides a truly unbiased service and provides suggestions for the most suitable mix of solutions that are appropriate for each individual home. This includes budget costs, estimated payback/return on capital and environmental impact.



In addition to private home owners this service is also provided to Local Authorities, Housing Associations and Private Rented Landlords and their Agents.

Energy Compliance Calculations for New Homes, Buildings, Extensions and Alterations

The Building Regulations Part L requires that a SAP Energy Rating is calculated to confirm the energy efficiency and the carbon emissions of all new homes to demonstrate compliance. SAP is the Governments Standard Assessment Procedure for energy rating homes and is used to calculate the dwellings Target Carbon Emission Rate (TER) and the Dwelling Carbon Emission Rate (DER). SBEM is used in a similar way for non domestic buildings.

This expert professional service is available to architects, developers, builders, and home owners for extensions and conservatories. Further details can be found on

Central Heating Installations by qualified heating engineers

Central Heating is not a luxury but a necessity and with 84% of energy in the home used for heating and hot water it is essential that energy efficient options are fully considered and evaluated before proceeding to appoint a heating engineer to install your new gas or oil boiler or to design a complete new system. You would not consider asking your local Doctor to carry out open heart surgery so why expect a plumber to expertly design and install a heating system. Always look for a qualified heating engineer who is a member of a professional body and who will work to a Code of Conduct and have appropriate insurance to safeguard you and your home just in case anything should go wrong with such a major investment.

Mains gas will continue to be the most predominant and cost effective option with the least environmental impact although this could change if and when our energy supplies are de-carbonised which is still many years away. So it makes sense to install the most efficient central heating boiler such as ?A? rated condensing boilers which are over 90% efficient compared to older ?G? rated boilers some of which are less than 60% efficient. Green Heat have pioneered the condensing boiler since 1990 and lobbied for these to be a requirement in Building Regulations which eventually happened in 2005 (Read paper presented to IDHEE conference in 1997).

Central Heating boilers and controls have improved dramatically in recent years with the use of electronics to provide accurate, state-of-the-art equipment which really has taken us into the twenty-first century. There are also many new developments such as passive flue heat recovery and energy management controls and the integration of renewable technologies such as solar thermal. Green Heat take pride in keeping up to date with all new developments to enable the best advice to be provided to customers and were one of the first companies to register as heating professionals under the Energy Efficiency Initiative promoted by the Government sponsored Energy Saving Trust. In addition to this Green Heat were founder members of The Heating & Hot Water Industry Council (HHIC) and Peter Thom is a Fellow and past President of the Institute of Domestic Heating and Environmental Engineers and is a board member of both these organisations.

Our Customer Promise is to:

  • Consider all your needs and offer a range of options.
  • Provide a written record of the discussion and a clearly costed written quotation.
  • Demonstrate how to use all equipment and explain the operating instructions.
  • Provide you with telephone numbers if you need assistance.
  • Contact you after work is finished to offer further assistance if required.
  • Green Heat is of course also registered with the Gas-Safe Gas Installers Register (Used to be CORGI) and has both public liability and professional indemnity insurance.

A survey of your home will be carried out, taking into consideration not just the structure but your lifestyle. You will then be provided with a quotation based on the most appropriate super efficient condensing boiler and controls - to provide you with maximum comfort and control at minimum cost. We will also consider your hot water needs and provide options on the integration of a solar thermal system or making the system solar ready. Your central heating system is an important part of your home - it deserves the best.

All our installation engineers are fully trained in all the latest methods and techniques - ensuring a neat and tidy installation and the minimum of disruption to your home. All old equipment is removed from site and we will flush out the existing systems and provide system inhibitor and protection to prolong the life of the new boiler. When the installation is complete, we will take time to ensure that you fully understand how to operate your new system to maximum effect - you will be amazed how much you save on running costs. It pays to consult the experts! Green Heat has over twenty years experience in the installation of super efficient condensing boilers. If you live within thirty miles of Cambridge, we will be pleased to provide a free, no obligation quotation.

Training & Seminars

Green Heat also provide training courses on Energy Efficiency including the latest SAP, TER/DER calculations and compliance with Building Regulations Parts L & F; The integration of new and existing products and their impact on the compliance calculations; Achieving levels 4, 5 & 6 of the Code for Sustainable Homes and environmental planning conditions such as the Merton Rule. These courses are available to the complete supply chain including manufacturers, suppliers, building control, installers, local authorities, housing associations, builders, developers and architects. For a wider audience we also organise and run seminars on these and related subjects and can provide a wide range of expert speakers.

Provision of Services Regulations Information

Name: Green Heat Ltd

Legal form: A limited company registered in London and incorporated in the UK

Services: Energy Efficiency Advice, SAP Ratings, Energy Performance Certificates, Green Deal Assessments, heating and hot water installations.

Registered office: 10 Jesus Lane, Cambridge, CB5 8BA

Postal address: 27 Fairway, Girton, Cambridge, CB3 0QF

Telephone: 01223 277278

Fax: 01223 577278


Public registers: Details about the limited company's registration can be viewed at under reference number 2553501

VAT number: 572 9308 20

Regulating body: Gas Safe registered, no. 25312 authorised by CAPITA

General terms and conditions: A letter of engagement accompanied by our standard terms and conditions will be provided at the start of any contract for works.

Applicable law: Unless otherwise agreed, English law, with the English Courts having exclusive jurisdiction in relation to any claim, dispute or difference concerning the service and any matter arising from it.

Work Guarantees: All works guaranteed for 12 months from date of completion, this covers parts and labour, please see our full guarantee document for further information. Boilers are also subject to a specific manufacturer’s warranty details of which will be provided on request. Your statutory rights are not affected by our guarantee. 

Complaints: Complaints can be made by contacting Peter Thom at the above address.

Gas Safe also operate a complaints procedure and you can access this by visiting or by calling 0800 4085500.

Which? Trusted Trader
Where we cannot resolve any complaints using our own complaints procedure, as a Which? Trusted trader we use Dispute Resolution Ombudsman for dispute resolution. In the unlikely event of a complaint arising and you wish to refer the complaint to them please contact 0333 241 3209 or via their website


Call +44 (0)1223 277278

Green Heat Ltd.
27 Fairway, Girton, Cambridge, CB3 0QF

© Green Heat Ltd is a registered Company in England & Wales,
Reg. No. 02553501

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