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Thread: HX Boiler Pressure verses Group Water temperature

  1. #1
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    HX Boiler Pressure verses Group Water temperature

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    I have a Giotto Premium (Rocket)
    I am now trying to fine tune my shot as much as possible while I consider a quantum grinder leap.

    I have read that ideally the boiler pressure should be between 1.1 and 1.2 bars. *This should give the group water temperature at the group of about 92 *(I have lost the thread on this subject)

    As present my Boiler pressure is around 1.3 bars *The comment I read was that the shot would probably be thin and bitter.

    I cant quite define my shot taste but it sort of tastes ?sour? at the back of my mouth on the sides as an after taste. (Oh dear!)

    I would really like to improve my shot
    I would be very grateful for more/any information.
    I have changed the boiler pressure so I know how to do this. *


    I am using 5 Senses 24/7 - fresh beans through my Rocky the clumps of which I break up. *I get no blonding now. *The pour is a little on the slow side - like cold honey.

  2. #2
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    Re: HX Boiler Pressure verses Group Water temperature

    A reply to myself:

    The general information about pressure and temp would be very useful.

    However I went to our local coffee shop who have a similar grinder to the one we are hoping for and had them grind some 5 Senses beans.
    Rushed home with my treasures and made my espresso -----

    It was good. *So I am thinking as every coffee snob of any experience keeps saying *to us novices --- the key to good coffee is the grinder.

    So I will leave Giotto boiler alone, enjoy my coffee which is okay and work towards the grinder of our choice.

    Thanks all

    David


  3. #3
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    Re: HX Boiler Pressure verses Group Water temperature

    Sell the rocky, sell the silvia, sell 1 tamper and youll have enough for a very decent grinder!

  4. #4
    kbc
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    Re: HX Boiler Pressure verses Group Water temperature

    My Giotto ranges from about 1.2-1.3 bar. There seems to be little difference in my shots throughout the range - All good.

    Try another coffee or upgrade your grinder. My k3 does a great job.

  5. #5
    Senior Member GregWormald's Avatar
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    Re: HX Boiler Pressure verses Group Water temperature

    In general the Rocky is quite a capable grinder, although it is not in the upper tiers of grinders.

    I found my Rocky improved significantly when I applied the plumbers tape for stability and the did the stepless mod. Of course that still didnt stop me upgrading to a Macap M4D. :D

    There are also lots of technique issues that can cause "off" shots. The video of the VBM machine use is a very helpful resource (a search should find a link to it).

    Greg

  6. #6
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    Re: HX Boiler Pressure verses Group Water temperature

    Thanks for the heads up Chris :)



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