[Homeroast] Vac-Pot Temp

Seth Grandeau grandeau at gmail.com
Wed Mar 28 13:54:30 CDT 2012


Super heating means that you got the water well above 212, because without
nucleation sites, you don't get the boiling process, which holds the temp
at 212.  Then, when you get one bubble, it's spontaneously sets off the
others, releasing all that energy at once.  I've done it with the
microwave, but I've never heard of it happening on a burner.  I'm glad you
didn't get hurt.

On Tue, Mar 27, 2012 at 9:53 PM, sci <scizen at gmail.com> wrote:

> I even use my Cory glass rod in the Bodum Santos (as well as my larger
> Cory). Works fine. And, I use the Bodum disk filter (a hard plastic disk
> with special grooves, without any cloth) in my table top Hario. It works
> fine too. I never have to worry cleaning a cloth filter. What's not to
> like? Maybe a touch of sediment. But like others here, I pour the coffee
> into an insulated carafe and stop pouring the last 1/2 ounce where the
> sediment is. As for temps, I have done temp probe checks throughout the
> brew process and here's how I get best results: add hot water in the base,
> add the siphon top and let water go up, bring to a slow boil, let it sit
> and preheat the whole unit, add coffee, stir, set timer. I usually get
> temps around 202F (I'm at 350ft above sea level), but some of the bubbles
> coming up and around the seal can get upwards to 208f. Still, the taste is
> what counts and it isn't bitter. I initially had a problem with very low
> temps in the upper. The water will go up even at 150f, far too cold.
> Another tip to the wise: be very careful with flash boil and superheated
> water.
>
> Here's my short tale: I preheated water for my Hario T5, poured it in the
> perfectly clean base to preheat, dumped that, added full amount of hot
> water (20 oz.). I put it over a butane micro burner, and waited . . . and
> waited. No boil?? I'm hovering over the top (what an ignoramus), looking
> down the neck, nothing. It took far too long to reach boil with the burner
> turned up high. I walked to the other side of the kitchen to get my ground
> coffee out of my Virtuoso. Then BOOM!!!! A volcanic like explosion of
> violent proportions, nay epic proportions, blasted out of the little base
> all the way to the ceiling. It all happened in 1/4 of a second; I saw it
> all. There was less than half of the water left in the base. What happened?
> Superheated water. I've been told that there were no nucleation sites for
> the bubbles to form, so ALL of the water reached 212f at the same time.
> Every molecule crossed the threshold simultaneously. I still shudder to
> think what I would be like today if I had remained hovering (stupidly of
> course)  over the top, blinded no doubt. Well . . . there was never a
> warning anywhere about this. Now I know that you are supposed to put the
> top chamber on and bubbles will form allowing a normal boil.
> FWIW,
> Ivan
>
>
>
> On Tue, Mar 27, 2012 at 1:00 PM, <
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> >   1. Re: Fwd: Vac-Pot Temp (Larry Dorman)
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> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Tue, 27 Mar 2012 10:56:43 -0500
> > From: Larry Dorman <ldorman at gmail.com>
> > To: "A list to discuss home coffee roasting. There are rules for this
> >        list,   available at http://www.sweetmarias.com/maillistinfo.html
> "
> >        <homeroast at lists.sweetmariascoffee.com>
> > Subject: Re: [Homeroast] Fwd: Vac-Pot Temp
> > Message-ID:
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> CAKR+ur1OppHSRqDXsYDtcveLee0FiKK7oEEYDxvs6KaNQfnXaQ at mail.gmail.com
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> > Content-Type: text/plain; charset=ISO-8859-1
> >
> > I've used the cory rod twice now and had absolutely no problems either
> > time.  I'm already convinced to brew with the rod instead of the
> > filter...  I'm getting clean cups and not even a hint of a stall.
> >
> > I'm glad I've brewed with both the filter and the rod just for the
> > experience, but I don't see that there is any reason not to jump
> > straight into using the rod if you have no interest in using the
> > filter.  Your mileage may vary if you use a different rod...
> >
> > LarryD
> >
> >
> > On Fri, Mar 23, 2012 at 7:55 PM, Larry Dorman <ldorman at gmail.com> wrote:
> > > So... ?my second brew is going to be with the cory rod. ?I'll let you
> > > know how well or poorly it goes...
> > >
> > > LarryD
> > >
> > >
> > > On Thu, Mar 22, 2012 at 6:30 PM, Jeffrey Kelly <jeffrey-kelly at att.net>
> > wrote:
> > >> I'm reading with interest as I'm thinking of buying a vac pot to try.
> > ?Just wondering if it would be better to start with a cloth filter and
> > graduate to a glass rod in time or learn with glass rod from the onset.
> > ?Pros...cons?
> > >>
> > >> -Jeff
> >
> >
> >
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