MarkPrince Moderator Joined: 19 Dec 2001 Posts: 5,653 Location: Vancouver, BC Expertise: Professional
Espresso: KvdW Speedster Grinder: Versalab M3 Grinder Vac Pot: A bit too many Drip: Bonavita Roaster: Hario Glass Retro Roaster
Posted Thu Nov 3, 2005, 4:33pm Subject: Re: Introducing the La Marzocco GS3
Some very quick details.
First and foremost, this is a preproduction, "experimental" machine that has some additional testing features and other things that may or may not make to the production unit. Where I know it's preproduction / testing, I will state that.
- cool touch wand and hot water pipes. - Full GB5 electronics package, PID controlled, controllable through the display panel. - Both steam and brew boiler are PID controlled (experimental). Steam boiler is PID'ed to test if it aids the machine in its economy mode. - Economy mode and full mode. But on this machine, economy mode runs it at 10AMP draw, brew boiler priority; full mode is 14amp, both boilers working all time. - Controllable temps to 0.3F via PID / control panel (experimental - may go down to 0.1F control) - Steam boiler is thermostat controlled, again through control panel. - Auto on / off ability (timer set) - 5 litre steam boiler, 3 litre brew boiler. - Paddle wheel version is still very much on the front page plans - they may sell two models down the road. - External aesthetics set for the most part, but the drip tray design may change. - mix water hot water tap controllable through physical mix AND electronics package. In 'lectronics, turn mixture on . off. Physical, side machine access lets you dial the mixture hotter or colder (experimental - may move to easier access for adjusting mixture) - guages same as used on GB5.
Gawd, there's more, but I want to get back and play.
Given that there's only one group, they'd almost certainly put the flowmeter ahead of the boiler, since its place on the multi-group Linea has caused so much trouble. In theory, it can be anyplace after the last branch point in the system. As long as there's only one group per boiler, there's no reason not to put it where it's not subjected to the heat, and won't cool the water. What I'm interested in is whether they solved the first-shot-from-idle problem. I'd expect so, but I'd sure like to know for certain.
pump pulse, but very brief (though we talked extensively about how the paddle wheel's preinfusion will be natural); it's because the feed on this group is at the bottom of the group - natural convection preinfusion would not fill the filter basket; on the paddle, it's design is different and will naturally saturate the group.
Working in semi auto mode I don't know yet, but can check.
I personally don't like most preinfusion (lever, e61 and paddle wheel preinfusion excepted). Is there a reason to use it Chris?
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