CoyoteOldMan I suspect there may not be much you can do once a brew boiler refill is called for - you need to wait for the boiler to get back to temperature, then you can start pulling again. If the pull is for half a boiler (0.3 l) it means waiting literally 2 minutes between shots. I don’t know what the ‘refill logic’ for the brew boiler in the Evo is; mine seems to top-up during the shot every shot, but I’m not sure.
The brew boiler is always full, it’s basically pressurised by the pump so as water leaves the group, it’s entering the brew boiler. You could think of it as as just wider part of the plumbing to the group.
The Standard E61 Vesuvius actually has an HX on/off setting (which I designed in), this was to have the ability to work in a prosumer setting, without disturbing temperature stability and in the highest volume setting, being almost as stable, but allowing much higher capacity. This was done to allow for continuous coffees, or HX off, the normal prosumer usage.
Evo doesn’t have this, because it doesn’t really need it. I asked all the questions because there is something he is doing causing this. Hopefully will be clearer once questions are answered.
If you do the calculations, reheating the amount of water that enters the brew boiler during a shot, takes approximately 35s.. Making shots quickly involves (even with a doser grinder that’s full. So shot timings would be (for a quick barista).
- The shot itself inc any preinfusion = 28s
- Wait after the shot to move cup, dregs to stop flowing and group pressure to drop = 3s
- Remove portafilter, knock out, dry brush clean 3s
- Dose, tamp and lock in portafilter, pull lever down = 6s (which would be pretty good going)
This means a time period of 40s between shots (and I am assuming coffee is ground during the shot)…although more realistically, I would doubt a home barista could produce shots that fast. In reality it’s going to be 50 seconds or more. Anyone out there is welcome to time themselves over 3 shots and prove me wrong. in a video. So something else is going on is the Evo can’t keep up with them.
