Amazing! I love everything about this. However, also being in Australia, I would have tried my luck with Consumer Affairs. Our new house was equipped with a gas boosted solar hot was service. The gas booster died a year out of warranty and instead of replacing just their proprietary booster unit, they said the whole system would need to be replaced at a cost to me of $10'000+. A few weeks of back and forth (and limited hot water) with consumer affairs made enough noise and the company caved and replaced the booster unit for free.

Yes, it was out of warranty, but it's abhorrent that anyone should have to purchase a whole new anything when a small portion of it can be replaced independently.