Nibe 518640 is a thermostat and temperature limiter used in several NIBE heat pump models, It’s an original NIBE component.

Details
•     Type: Thermostat & temperature limiter
•     Function: Protects the heat pump by limiting maximum temperature and ensuring safe operation
•     Part number: 518640
•     Category: Spare part for NIBE heat pumps

Compatible Heat Pump Models
According to multiple spare‑parts listings, this part fits:
•     NIBE F100P
•     NIBE F1126
•     NIBE F1145
•     NIBE F1153
•     NIBE F1155
•     NIBE F1245

If You’re Replacing This Part because this component is a safety limiter, it’s important to:
•     Confirm compatibility with your exact heat pump model and serial number
•     Ensure installation is done by a qualified heat‑pump technician