What is a prosumer espresso machine?

Prosumer machines (professional + consumer) are high-end home machines that borrow technology from commercial equipment — dual boilers, PID temperature controllers, and commercial-grade group heads. Brands like Breville Barista Express Pro, Rocket Espresso, ECM, and La Marzocco Linea Mini occupy this space. They cost $1,000–$5,000+ but can last 10–20 years with proper maintenance, making them cost-effective for serious home baristas.