I'm actually in need of a new hot water tank and have been looking for a heat pump one. Wonder if these will be available in Australia, and how they compare to the current range.
I have a heat pump hot water unit in Australia - Sanden: https://www.sanden-hot-water.com.au/
CO2 refrigerant as well.
The Australian electronics YouTuber Dave Jones (EEVBlog) had a heat pump water heater installed in his house, and while on the outside it was branded "Reclaim Energy", it had a Made in Japan sticker and was internally a Mitsubishi.