Faema Brewing group called E61. The lever on the grouphead allows the operator to pre-infuse the coffee with water from the heat exchanger. Please note that true pre-infusion requires a direct water connection (possible when connected directly to a water line) whereby the water pressure from the water line creates the true pre-infusion.This model has passive pre-infusion when utilized in reservoir mode where the steam pressure in the thermosyphon tubes pushes water through the coffee grind. Professional joystick valve technology on the steam and hot water valves can only be locked in the full on and off position. High quality heating element produced with a stainless steel flange (part which connects to boiler). Boiler safety valve on top of boiler opens if the boiler goes into overpressure – usually due to calcification of the pressurestat pipe. Rotary vane pump with internal adjustment screw is placed on rubber dampening brackets – please note that sometimes the pump will shift in transport and knock out the reservoir connection under the water reservoir. ECM has placed tie-wraps under the machines, but sometimes these break in transport, too. The overpressure valve (OPV) to release excessive brew pressure. Magnetic float in water reservoir will power off heating element when water level is low. Full size pressurestat properly configured vertical and away from boiler top. Dual safety thermostats in case one fails during a potential overpressure situation. Dual gauges are offer greater visible at top and not hidden near bottom of front panel. There is one gauge for pump/extraction pressure, and one gauge for steam pressure. assembled in Milan, Italy by a third party (not ECM Manufacture)