How do I add hot water storage?

How water storage can be added within the Heat Pump task. Simply scroll to the Hot Water Storage section and click the pencil icon. Here you can choose from either Heatpump's recommendations our our full list of heat pumps. The recommendations given, are based on the number of bedrooms and occupants. These can be editted at the top of the page and new recommendations generated. 

You should also review and edit the Hot Water Storage settings  as necessary by click on the cog icon, next to the pencil.