📹 Rocket Espresso Appartamento, Mozzafiato and Giotto: Drain Heat Exchange Boiler Updated March 11, 2022 19:42 Learn how to drain the boiler on a heat exchanger Rocket Espresso machine. Featured content applies to Rocket Espresso Appartamento, Mozzafiato, and Giotto models. Rocket Espresso Machines: Draining a Rocket Heat Exchange Boiler