The Passive House is not an energy standard but an integrated concept, assuring the highest level of comfort.
The definition of Passive House design is based on its extremely low energy need. Our Passive House builders create properties that consume less than a quarter of the energy required for a standard building. These buildings have no separate heating solutions apart from heat recovery ventilation systems. The efficiency is based on well-insulated and air-tight passive building envelope solutions.
The structures are designed and built without any cold bridges that reduce heat insulation. The building’s outer shell is airtight and the microclimate is draught-free and evenly warm. The high annual utilisation rate of heat recovery in ventilation guarantees only minor heat losses in ventilation. What remaining energy is needed for heating can be covered using simple building system solutions.
Find out how our architects and builders not only meet but beat Passive House standards below.
Conventional Passive House
WeberHaus Passive House
|All elements of the building’s external envelope should combine to provide a U-value of no more than 0.15 W/m²k.||The ÖvoNatur Therm wall and roof elements achieve a U-value of 0.11 W/m²K.|
|Conventional central heating replaced by a combination of waste heat from appliances, heat recovery from ventilation and body heat from people.||WeberHaus pioneered energy efficient homes in Germany. Our extensive experience and expert knowledge is evident in our wide range of highly efficient heating systems, including heat recovery ventilation.|
|Triple-glazed advanced window technology. The combined U-Value of glazing and frames should not exceed 0.8 W/m²k.||WeberHaus offers a variety of materials for window frames, including eco-friendly wood and a maintenance-free combination of wood and aluminium.|
|Air leakage through unwanted gaps and cracks in the building fabric must be less than 0.6 times the house volume per hour under negative and positive pressurisation.||To ensure that every building passes our exacting quality standards, every WeberHaus home must pass the blower door test.|
|Mechanical whole house ventilation with heat recovery - the recovery rate should be no less than 80%.||Ever since building our first Passive House, we have used mechanical ventilation systems with a heat recovery rate of up to 90%.|
|Use of bridge free connection details, or calculations of losses at thermal bridges.||The entire construction is free from thermal bridges.|
|In central Europe, solar heat gains are, on average, greater than heat losses - even in winter.||We work closely with our Passive House architects to extract the maximum benefit from solar energy.|
|Use of renewables - particularly for heating water and generating electricity.||In addition to solar energy, we offer innovative systems that recover renewable energy from air, water or geothermal sources.|