How efficient is the integrated heat recovery system in the Audi A2?

I've heard that the Audi A2 has an integrated heat recovery system. Can someone tell me more about its capabilities and effectiveness?

The integrated heat recovery system in the Audi A2 is excellent. It effectively recovers and recirculates waste heat from the engine and exhaust, reducing fuel consumption and emissions. But keep in mind, it works best in cooler climates.

I have owned an Audi A2 for years and can attest to the efficiency of its heat recovery system. It works seamlessly in the background, optimizing energy usage and keeping the cabin at a comfortable temperature.