The Grant Aerona Installation Pack P typically refers to a complete set of installation materials and components designed for the Grant Aerona3 and Aerona 290 air source heat pump systems. The Aerona3 and Aerona 290 are types of heat pumps produced by Grant UK, which are used for providing heating and hot water in residential and commercial settings.

The Installation Pack P would include everything needed for installing the heat pump, such as:

Aerona installation Pack P - Direct S-Plan Non Pre-Plumbed 2 Port Valve

• Flexi Foot Kit
• Mag One DUO Filter
• 18L Sealed System Kit
• 32A AC Isolator
• Immersion Relay 

It's important to note that such installation packs are typically designed for qualified installers to use, and it’s essential to follow all guidelines and regulations during installation to ensure safety and optimal performance.