Another big innovation for the Series 1 is its patented heating system. Most espresso machines use either boilers or thermoblocks to heat up the water that goes into espresso. Boilers have admirable stability, but take forever to get hot. Thermoblocks are near instant, but less stable.
Fellow’s heating system falls somewhere in between, with a boiler supplemented by a thermoblock that heats water before it enters the boiler, and a heated group head that helps stabilize temperature at the portafilter….
