MCS heat pump standard to be split into design and installation standards


Post-closing changes to the National RHI program will allow installers to work alongside separate designers

MCS, the microgeneration certification system, is to split the existing heat pump standard (MIS 3005) into two standards – one for the design of heat pumps (MIS 3005-D) and one for the installation of heat pumps. heat (MIS 3005-I). The changes that will become mandatory from April 1 will follow the closure of the Renewable Home Heating Incentive on March 31.

MCS said it wanted the new standards to make the market more accessible by giving heat pump specialists the option to focus on either design or installation, depending on their skills. At the same time, the new standards will accommodate contractors installing heat pumps alongside independent heat pump designers.

The new standards will not affect existing heat pump contractors, as by default they are certified for both heat pump design and installation, MCS said. Certifications will continue until their next certification surveillance assessment, when installers can choose to be certified for design, installation, or both.

The national standards body has outlined key considerations as of April 1:

  • If a company is currently MIS 3005 certified for design and installation, they can choose to stay as is or become a certified designer or installer at their next certification monitoring assessment.
  • Any contractor (designer or installer) who holds the customer contract can register a system on the MCS Microgeneration Installation Database (MID).
  • While it was mandatory to have a certificate of conformity for the RHI, it will no longer be, following the closure of the system
  • Designers can work immediately to the new standard, even if installations are completed before the old standard is retired.

Ian Rippin, Managing Director of MCS, said: “This is a positive outcome for installers as we approach the end of DRHI. The diversification of new heat pump standards will allow the industry to offer the best service to customers and welcome contractors who wish to streamline their skills. Our change reflects the market. This is a step in the right direction as we seek to encourage more installers to adopt low-carbon heating and, in turn, increase adoption of heat pumps in homes and buildings not residential in the UK.

MCS is a quality assurance system supported by BEIS. Details about:


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