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About MCS

MCS is a mark of quality and demonstrates
compliance to industry standards that companies
strive to meet. It highlights to consumers that
companies are able to consistently install or
manufacture to the highest quality every time.

MCS has today published a new version of MIS 3005 (Requirements for MCS Contractors undertaking the supply, design, installation, set to work, commissioning and handover of microgeneration heat pump systems - Issue 5.0).

This is a major update to MIS 3005 Issue 4.3.

Implementation Timeline

MCS Contractors shall continue to operate in accordance with MIS 3005 Issue 4.3 until 17th May 2017. MCS Contractors may commence working in accordance with MIS 3005 Issue 5.0 from 17th May 2017. MCS Contractors must commence working in accordance with this update by 30th October 2017.

Customer RHI eligibility

  • Any installation with a commissioning date prior to 17th May 2017 must be installed in accordance with Issue 4.3 of MIS 3005 and could be eligible for RHI if applying within 12 months of commissioning date.
  • Any installation with a commissioning date between 17th May 2017 and 30th October 2017 may be installed in accordance with Issues 4.3 or 5.0 of MIS 3005 and could be eligible for RHI if applying within 12 months of commissioning date.
  • Any installation with a commissioning date after 30th October 2017 must be installed in accordance with Issue 5.0 of MIS 3005 and could be eligible for RHI if applying within 12 months of commissioning date.

Summary of Updates

Updates have also been made to the Heat Pump Compliance Certificate and the Heat Pump Handover Pack Information. An MCS Heat Pump System Performance Estimate (MCS 031) has been created for all MCS Contractors to use at quotation stage and a recommended procedure to follow from the initial enquiry through to the handover of a heat pump installation.

MIS 3005

Performance Estimates:

  • Introduction of an MCS Heat Pump System Performance Estimate. This formula is mandatory to use at quotation stage if the property is eligible for a domestic EPC and replaces Appendix E of the standard which has been removed. 
  • This would give a potential consumer an estimate of heat pump running costs compared to their existing heating system as well as estimated RHI income and likely capital cost. All MCS Contractors will use the same format, providing clarity and comparability for the consumer.
  • MCS Contractors will be required to use the EPC for the MCS Heat Pump System Performance Estimate to calculate a whole house demand.
  • A room by room heat loss calculation will still be required but will take place as a final design/installation survey after a contract is agreed between the parties.  If there is a change to the agreed design, and/or estimated performance of the system, a variation to contract shall be presented to the customer and agreed with them before proceeding with the installation. If such variation in contract cannot be agreed upon, the customer may cancel the existing contract without cost, obligation or liability. Where a change has occurred to the estimated performance, the MCS Contractor shall issue to the customer, an updated estimate of performance, in accordance with the ‘MCS Heat Pump System Performance Estimate’.

Heat Emitter Guide (HEG)

  • Use of the HEG with the client will no longer be mandatory. The new procedures will be identified in MGD 002.

Intermittent Heating

  • Heat pump sizing and selection. Greater flexibility has been provided to MCS Contractors to size heat pumps in accordance with the condition of the dwelling. MCS Contractors will no longer have to add 20% to the calculated heat requirement of the building when selecting a heat pump.
  • The MCS Contractor will instead be required to use Table 2(B) external temperature selection (99.6%) which has now been added to MIS 3005.

Appendix D has been removed

The following will be uploaded to the MCS website on 17th May 2017 to be used in conjunction with MIS 3005 Issue 5.0:

  • Heat Pump Compliance Certificate Issue 2.0 (CC 002) (CC 005).
  • MCS 031 - MCS Heat Pump System Performance Estimate v1.0.
  • Heat Pump Handover Pack Information.

MGD 002

The guidance document MGD 002 is currently under development to reflect the changes to the standard.