Check your terminal before departing; Terminals 2 and 3 share a station

https://marioabpg472.image-perth.org/national-rail-to-heathrow-routes-transfers-and-tickets-explained-2

Check your terminal before departing; Terminals 2 and 3 share a station, while Terminals 4 and 5 have their own dedicated rail stops on the tube and Elizabeth line.