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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 version 1.3 of the MCS Heat Pump Calculator, along with an accompanying user guide.

This spreadsheet calculator is freely available for MCS Contractors 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

To download the calculator and guide please visit the "Heat Pump Installer Standards" section on the MCS website. If you have any feedback relating to the calculator, please submit this by email 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 MCS Contractors can continue to use alternative calculators as long as these meet the requirements of MIS 3005.