This VF02 Sunamp Optimino Heat Pump & PV Key provides seamless compatibility between your Thermino xPlus, your boiler 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 Boiler & PV Key – Enables seamless compatibility between your Thermino xPlus, your boiler and solar PV – Measures 25mm x 25mm x 15mm – Simplifies connections for efficient integration – Future-proofs energy needs