Some says a pre flush helps, having a PID even better. engineering espresso
But from HB, first and second shot is not that stable. Between 90 to 96 deg c
And HX requires a flow restrictor ( o ring)to improve the stability mobile01
Managing HX brew temp ... With a cooling fan
LM GS/3(saturated grouphead) does it much better bilibili
SCA protocol says 93 +/- 3 deg c
From Ascaso:
T group is actually refers to thermoblock type
Warm up simulation using openFOAM, HB
Reference
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