Update of closed-loop vertical borehole standard
26th October 2026
UK: The Heat Pump Association UK (HPA UK) has published a CIBSE-endorsed update to its closed-loop vertical borehole standard, a key design, installation and maintenance reference.
This latest version 5 is the first updated technical standard released since the merger of the Ground Source Heat Pump Association (GSHPA) into HPA UK earlier this year.
The standard is said to have been updated by industry experts to reflect current best practice, technological advancements and the increasing role of ground source heat pump systems in the UK’s transition to electrified heating.
Designed for engineers, installers, and any other professionals involved in the specification and implementation of vertical borehole systems, it is said to provide a consistent framework that promotes health and safety, environmental protection, system longevity and reliable outcomes for consumers.
The publication follows the HPA UK’s recent recommendations paper, Accelerating the Deployment of Heat Pump Driven Low Carbon Heat Networks and Drilling, which identified the review of the closed loop vertical borehole standard as a key priority for the sector.
Lead author Chris Davidson described the updated standard as an important step forward for the sector, bringing the guidance up to date with current best practice and the latest developments in ground source heat pump technology.
Ahmed Hegazi, CIBSE’s head of knowledge and digital, commented: “Ground source heat pumps can deliver some of the most efficient low carbon heating and cooling available, but only if what happens below ground is done right. Boreholes are hard to fix once installed, so getting design and installation right first-time matters.”
The Vertical Borehole Standard – Version 5 is available now through HPA UK. The standard is available free of charge to HPA UK members on request, or can be purchased by non-members for £125 (+VAT) here.
