How does a heat pump hot water system work?
A heat pump works like a refrigerator in reverse. It extracts heat from the air to heat water. Electricity is only used to operate the pump to move the heat; it is not used to create the heat.
For air sourced heat pumps that extract heat from the air, you will need to nominate the number of small-scale Technology Certificates (STCs - previously known as Renewable Energy Certificates, RECs).
For ground source heat pumps that extract heat from the ground, the system must also be used for space heating or cooling. BASIX recognises ground source heat pumps for single dwellings only.
Note: From 1 January 2011 RECs were split into two types: small-scale technology certificates (STCs) and large-scale generation certificates (LGCs). RECs is still used as a general term covering both STCs and LGCs. STCs apply to domestic heat pump hot water systems however some BASIX certificates may still refer to the term RECs.