No, the heat pump has a built in hot water cylinder. The cylinder is placed in the bottom of the heat pump.
The Advantages of one complete unit:
• No heat losses as in split unit types. (Split units make use of either refrigerant or circulate hot water to the geyser. This results in heat losses and a lower efficiency) 
• Superior hot water cylinder to the conventional geyser that only lasts 5 years.
• Copper heating pads around the outside of the hot water cylinder. The advantage of this is that there is no heat exchanger in the hot water cylinder which if ever malfunctioned would leak gas into the hot water. Toxic if consumed.
• Easy installation and maintenance
• No pipes and hot water cylinders in the roof.