The Heat Pump Association (HPA), in collaboration with certification bodies NAPIT and NICEIC, has released new guidance aimed at supporting heat pump installers in selecting the appropriate residual current device (RCD) for domestic installations.
The guidance responds to a sharp rise in heat pump deployment across the UK. In 2024, nearly 100,000 heat pumps were sold - a 63% increase compared to 2023. As more heat pumps are integrated into residential electrical systems, the importance of proper electrical protection is growing.
The newly published document focuses on helping installers identify suitable RCDs for domestic heat pump installations. It outlines a four-step selection process, explains the characteristics of different RCD types, and addresses specific safety and operational considerations relevant to heat pumps. The guide also includes a frequently asked questions section to clarify common uncertainties.
According to the HPA, the document is both informative for general readers and practical for installers with electrical competence.
Charlotte Lee, Chief Executive of the HPA, stated: “The Heat Pump Association is dedicated to supporting installers and promoting high quality heat pump installations to improve the consumer experience. This new Guidance adds to the HPA’s ongoing efforts to support the sector as it scales up to meet increasing demand. It aims to simplify the RCD selection process and provide clear answers to common questions.”
A NAPIT representative added: “Providing technical guidance to Competent Persons on the installation of renewable technologies, to ensure they perform to their optimum levels and leave consumers satisfied, is an unceasing objective for NAPIT. Being involved in this guidance bolsters this commitment when it comes to Heat Pumps.”
From NICEIC, a spokesperson commented: “NICEIC is pleased to have partnered with the Heat Pump Association and industry partners in developing comprehensive guidance for heat pump installers. This guide will streamline the understanding and implementation of RCD protection requirements, empowering installers to deliver safe and reliable heat pump systems.”
The new guidance reflects the sector's focus on maintaining installation quality as heat pump adoption accelerates. With heat pumps playing a central role in the UK's net zero transition, reliable electrical protection is essential for long-term performance and safety.
The full guidance is available on the HPA’s technical resources page.