This PX02 Sunamp Optimino Heat Pump & PV Key provides seamless compatibility between your Thermino xPlus, Ecoforest ecoAIR Pro or ecoGEO Pro R290 series heat pump, and solar PV. This compact key, measuring 25mm x 25mm x 15mm, simplifies connections, ensuring efficient integration and future-proofing for your energy needs. Features & Benefits: Sunamp Optimino Heat Pump & PV Key – Phnix Enables seamless compatibility between your Thermino xPlus, a Phnix Greentherm R290series heat pump and solar PV Measures 25mm x 25mm x 15mm Simplifies connections for efficient integration Future-proofs energy needs