MCS has published an updated version of MIS 3005-D: The Heat Pump Design Standard
2 December 2024
Feedback from industry suggested that there was a lack of clarity regarding installing Hybrid heat pump heating systems under MCS, and a lack of guidance on sizing these systems, which was felt to be restricting the installation of such systems.
Further to consultation in February this year, this update to MIS 3005-D clarifies the circumstances under which a hybrid heat pump heating system would be compliant with MCS requirements and is expected to increase the number of heat pumps being installed to support reaching government targets to install 600,000 heat pumps a year by 2028.
This update includes:
• The introduction of a definition of a ‘hybrid heat pump system’ and ‘supplementary heat source’.
• The removal of the requirement that a heat pump should be selected that will provide at least 100% of the calculated heat load when installing a hybrid heat pump system.
• Introducing a new procedure for when installing a hybrid heat pump system, including:
- The requirement that the heat pump shall be selected to meet a minimum of 55% of the calculated heat load of the building at a 55°C flow temperature, at design conditions.
- The requirement that the controls’ philosophy shall be capable of prioritising the heat pump.
The changes were agreed in conjunction with the MCS Heat Pump Working Group. To access the standard, please visit the MCS Standards & Tools Library or click the link below. Any queries should be sent to meetings@mcscertified.com.