Dual boiler heat exchanger
Steam boiler: 2.2L Heat Exchanger type.
With pstat valve to control pressure/ temperature
Brew boiler: 1.2L
Brewing temperature with PID control: sensor located in top of boiler, adjust wireless by external hand controller
E61 grouphead
Rotary pump in 高配板
Anyways, very good CP ratio.
But overall performance may not be well tuned. Eg brew pressure may sometimes "hammer" once when reaching 9 bar.
They provide,as after sales upgrade, to add paddle to top of group head. This is for flow control
which is selling ~¥400,suitable for many E61 machines
Another review
Btw, those GS3 clones, the grouphead handle is just a brew on/off switch only. Beware
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