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They're kind of independent whereby the group head will eventually overheat if being left on for a while (not recommended) even if the pressure remains consistent (0.8 bar ish is seen as optimum).
Deffo agree with pulling a mug of water to heat the portafilter, group and the mug!
Also give the steam wand a blast before pulling any water as false pressure can build up too!
Kalkhoff
ltc
Post! Good tips, thanks. Would a pressure gauge serve a similar purpose to a thermometer, in terms of knowing when the machine is ready to pull a shot? Or would it be worth having both?
The single hole tip is really handy, I'll definitely be steaming milk for my partner and guests (once I'm proficient enough not to embarrass myself anyway). I'll send you a DM!