Wantirna South sits near 1549 people per square kilometre. Heating load in a large house is the biggest single item, so that is where the plan starts. Wantirna South is 25 kilometres from town. Estate housing usually has the board capacity and the roof aspect to make this easy.
In Knox, which includes Wantirna South, the applications that matter are the distributor's and the rebate scheme's, not the council's. We treat Wantirna South, Bayswater and Boronia as one working area rather than three separate postcodes.
Postcode 3152, about 13.4 square kilometres, 20754 residents at the 2021 census: that is the shape of Wantirna South inside Knox. The area we cover around Wantirna South runs through Bayswater, Boronia, Glen Waverley and Knoxfield, and a booking in any of them is treated the same way.
Wantirna South is around 5.8 kilometres west of our workshop in Boronia, close enough that the van is stocked for the job before it leaves.