The new standard for Heat Pump, MCS 3005 version 4 comes into force on 16/03/14. We are updating our online MCS calculator to comply with the new standard and the server will be updated on Saturday 21/02/14. During the update the calculator will be offline. The new calculator complies with all of the latest MCS standards for PV, Solar Thermal, Biomass and Heat Pump. The revised help documentation will also be available next week.