On Top a high-performance R290 Hot Water Heat Pump with COP rating of 4:1 (saves 70% energy!) and underneath a mains pressure water cylinder with 270L or 200L storage capacity (suitable for 2-5 person households).
Water temperature of 75°C possible due to element booster mode.
The power consumption is about 1/4 of a traditional electric cylinder, and about 1/3 of a gas hot water!