heat exchanger espresso machines
Heat exchange machines have a single boiler that is always set to steam temperature. A metal tube runs through the boiler, which flash heats the water at around 200 degrees to the grouphead. This clever design delivers fresh water from the pump to the grouphead, and mimics the capabilities of a double boiler machine.
With a heat exchanger machine, dry steam and hot water are available at all times, without the need to flip any switches or switch any modes. Also, you are able to steam your milk and brew your coffee at the same time, leading to the freshest, professional-style latte.