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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 released a new heat pump calculator which is available to download from the MCS website – link here.

This spreadsheet calculator is freely available for MCS certified installers to use. The functionality of the calculator includes:

  • Room-by-room heat loss calculation
  • MCS 020 calculation tab (Air source heat pumps only)
  • Ground loop sizing tab (Ground source heat pumps only)
  • Radiator and underfloor heating sizing tabs
  • Graphs on annual running costs and CO2 emissions
  • Compliance certificate

As this is the first release of the calculator, MCS may need to update the calculator following any feedback. Therefore you are advised to check the MCS website regularly for the latest version of the calculator rather than saving a local copy. Please submit any feedback to This email address is being protected from spambots. You need JavaScript enabled to view it. with a subject heading of 'MCS heat pump calculator feedback'.

Please note that use of this calculator is optional and installers can continue to use alternative calculators as long as these meet the requirements of MIS 3005.