Wairarapa – Greytown

In by Harry Iliffe

Wairarapa – Greytown

eHaus Euro - Certified Passive House Classic

This comfortable, contemporary three bedroom home combines functionality with form, with visual appeal from the street and sympathetically sitting toward the south boundary that creates space for gardens and indoor/outdoor flow.

The more complex shape means a higher form factor. The mono pitch roof efficiently sheds the strong Wairarapa winds

Design Components

Floor – Fully insulated concrete pad with a U-value of 0.214 W/(m²K)

Wall – ecoBlock ICF wall  U-value = 0.244 W/(m2K)

Roof – Double layer of fibreglass insulation U-value of 0.193 W/(m²K)

Window Joinery FrameEnergate – Ludwig Häussler Gmbh, EN 843 Upvc U w-value = 0.87 W/(m2K)

GlazingTriple glazed units 4/18/4/18/4 Argon Low E U g-value = 0.5 W/(m2K)  g -value = 52 %

Ventilation – Zehnder Comfo Air 350 MHRV

Hot Water – Flat plate automatic drain down Solar Thermal system with 300 Litre storage tank

Heating/Cooling – 500W inline heat coil fitted in the ventilation system. Controlled by comfo ease panel

Ecological features  – 2500 Litre Rain water harvesting system

Performance Specifications

Total Floor Area – 202.4 m2

Ground Floor Area – 167.7 m2

Garage Floor Area – 34.8 m2

Heating demand: 15.6 kWh/m2/annum

Heating Load: 14 W/m2

Frequencey of Overheating 2.7%

TFA: 150.2m2

Form Factor: 3.61

Air Leakage@50Pa

PE: 109 kWh/m2/yr

Experience this eHaus for yourself

Contact eHaus Wairarapa

Passive House Project Team


eHaus/S Naus Architecture


eHaus Wairarapa


eHaus - Jon Iliffe


MosArt Ireland