Split system
A heat pump with an outdoor and an indoor unit joined by refrigerant pipes.
The refrigerant pipework between the two units is specialist work. In Great Britain, anyone connecting the refrigerant pipework of a split heat pump using F gas needs their own F-gas qualification; Northern Ireland has its own F-gas rules. Plumbers hand that work over.
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Sources
Sources checked 31 October 2026. Guidance, grants and official pages can change.
- Government guidance: Qualifications to work with F gasIn Great Britain, people working on equipment containing F gas, including heat pump systems, need their own F-gas qualification.
- DAERA: Fluorinated greenhouse gasesNorthern Ireland's F-gas rules, which follow the EU F-gas law and are run by DAERA.