
This German-built heat exchanger pulls shots that rival commercial machines, with PID temperature control that eliminates the cooling flushes other E61 machines require. The catch is a known recurring flaw: the Solid State Relay fails predictably after two years of daily use, a $35 part that requires technical skill or a service call to replace, and the PID tuning forces a choice between proper brew temperature and strong steam pressure. Buy it if you're making one or two drinks daily and don't mind scheduled maintenance for exceptional espresso quality, but skip it if you need worry-free operation or fast milk drink production.