Thermofix Services Ltd.

Thermofix Services: heat pumps and boilers in Sheffield and the Peak District

Thermofix Services Ltd. is a small limited company working in the heating sector, with a stated focus on decarbonising Sheffield and the Peak District. Its activity centres on heat pumps, boilers and heating system design, and the company presents itself as equally at home with newer renewable technologies and with the more traditional heating systems it expects to remain in use for years.

A three-director company

The business is run by three directors — Gareth, Jim and Steve — who, according to the company, are also the people who answer the phones and attend customers' homes. Thermofix describes itself as a team of three and points to its Trustpilot reviews page as a reflection of how it works.

Services offered

• Heat pump installation, including air source heat pumps
• Boiler installation and boiler servicing
• Heating system design
• Repair and maintenance of existing heating systems
• Associated work such as radiators and heated towel rails

In its published customer reviews, the company is described as carrying out a thorough heat-loss survey before an air source heat pump installation, talking clients through options and siting, checking existing pipework and radiators, and managing the Boiler Upgrade Scheme process on the customer's behalf. One review also mentions linking a heat pump system to existing solar panels.

Coverage across Sheffield

Thermofix states that its coverage spans a large area of Sheffield: from Stocksbridge in the north, through central Sheffield, to Calver village in the south and west. The company says this positioning allows it to reach 99% of its customers in very little time.

Approach to an evolving industry

The company describes two priorities: anticipating where the heating industry is heading and keeping ahead of the curve by enrolling on courses for future technologies and integrating them into its system designs and finished projects, while continuing to maintain and repair traditional systems so they last rather than becoming part of a throwaway culture.

Customer feedback

Reviews displayed on the site, dated between May 2024 and February 2025, describe installations of air source heat pumps and boilers, praising thoroughness, cleanliness and explanations of how systems work. One reviewer reports a measured COP of 420% for a newly installed air source heat pump, and another mentions a 10-year guarantee on a boiler installation. These are individual customer accounts rather than verified performance claims.