As said, heated seats have a green plug. If your car did not have this option, you will need to find a loom and switches, and no, not all Leather Recaro's are heated.

Factory Spec: Electronic Climate Control, Electric Sunroof, Heated Leather Recaro's. Mods: KO3s, CCCTech Remap, CAI, Forge 007p DV, Miltek Cat Back with Torque Exhaust De-Cat & Vortex, Lenso Spark Plugs, N75J Valve, Polished Inlet Manifold, Tints, Mk V Rear wiper, Anniversary Kit, FK Coilovers, Eibach ARB, Auto Windows, Bora Sport Clocks... The List Goes On! KO4, Front mount & New Colour on the way...
VAG COM & TachoFiddler. Cluster mods, Cluster swaps, Key Programming in North London. http://www.mydubspace.com/AGU_Turbz