There are different interpretations on what constitutes a ‘Passive House’. However, MosArt uses only the definition provided by the Passivhaus Institut in Darmstadt, Germany, as follows:
  Maximum annual space heating requirement of 15kWh per square metre:   15kWh/(m2a)
  Minimum airtightness of 0.6 air changes per hour measured at a pressure of 50 Pascal: n50 0.6 1/h
  Maximum annual primary energy requirement of 120kWh per square metre (domestic hot water, heating and auxiliary electricity): 120kWh/(m2a)
Optimal heat load of 10 W per square metre: 10W/m2
  Achieving the first three of the above is required for official Passive House Certification. The optimal heat load above should be achieved if you wish to heat your home via the mechanical ventilation system
Passivehaus institut logo
Click here to see this slide