Nibe Expansion Card 

Part Number 818166

The Nibe Expansion Card – Part Number 818166 is an original accessory designed to extend the functionality of Nibe heat pump systems. It’s typically used to enable additional control features such as:
•     Managing extra heating circuits
•     Controlling external devices like pumps or valves
•     Integrating with smart home systems or other automation setups

🛠️ It’s most likely compatible with Nibe ground source heat pumps, especially models in the S&F-Series, such as the Nibe 1345,1245,1145,1155,1255 & SMO20, SMO40 or similar units. These systems often support expansion modules to tailor heating and cooling across multiple zones or integrate with pool heating, ventilation recovery, or passive cooling systems.
If you’re planning to install or replace this card, I’d recommend:
•     Checking your heat pump’s installation manual for supported accessories
•     Contacting a Nibe-certified technician or supplier for confirmation
•     Providing your heat pump’s model and serial number to ensure compatibility