Passive House can be defined in so many ways:
In accordance to Passipedia a Passive House is "The world‘s leading standard in energy efficient design." The special features of energy-efficient buildings include five basic principles: Thermal Insulation, High Performance Windows, Ventilation/Heat recovery, Airtightness, Thermal Bridge free design. Adhering to building standards that are truly energy efficient, comfortable, affordable and ecological all at the same time.
At the technical and mathematical level Passive House is defined by the following heat flow calculation: 30 m3/hr/pers * 0.33 Wh/(m3K) * (50 - 20) K = 300
Ecocor defines its Passive Houses as sustainable, affordable, comfortable, and versatile homes.