Solar efficient Boonoorong at Flinders for sale

Boonoorong on 20 hectares outside Flinders has been listed with $1.7 million plus hopes.

It was built in 2003 as a holiday house by owners Grant Murray and Janet Truscott who had backgrounds in engineering and science.

Energy efficiency was the priority when commissioning the build.

Kay & Burton agents Meg Pell has the listing, a Sunpower Design energy-efficient property.

The couple told Fairfax Media the solar-passive efficiency of the home meant very little energy was needed to warm the home in winter, and cool sea breezes blow from the coast to cool the home in summer.

They estimated the return on investment for the photovoltaic system (which converts solar energy to electricity) to break even after 30 years.

But with the demand for energy efficient materials, they now estimate less than 10 years.