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Thread: E61 Group Head for non-HX machines

  1. #1
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    E61 Group Head for non-HX machines

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Can someone explain the mechanics of the e61 group head on a non-HX machine?

    I understand how it works for HX machines but am curious as to how it works - as in where the water which cycles around the head is drawn from - for a dual purpose single boiler. I cant understand how the cycling water does not end up back in the boiler?

    This is purely an exercise in curiosity.

    Thanks


  2. #2
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    Re: E61 Group Head for non-HX machines

    Just did a quick search and one way of doing it is to bolt the grouphead directly to the boiler. I would assume that you could have it independently heated by its own element (think I have heard of that). That would seem to be the two main ways it could be done.

  3. #3
    TC
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    Re: E61 Group Head for non-HX machines

    The groups are attached traditionally.

    The difference is that in a HX machine, the boiler is at well over 110 deg.

    In dual purpose single boiler machines (at least the good ones), rheostatic control allows for the boiler to be accurately set to brew temperature withthe use of a Scace device. This is why theyre so much better than a Silvia for example...

    When you press the steam button, the steam thermostat takes over and raises the boiler temp for milk texture...

    Hope that helps...

    2mcm

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    Re: E61 Group Head for non-HX machines

    the steam thermostat takes over and raises the boiler temperature for milk texture so that is the process...

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    Re: E61 Group Head for non-HX machines

    Quote Originally Posted by 18475F494249454C4C4F4F474B442A0 link=1252111473/2#2 date=1252141689
    ... allows for the boiler to be accurately set to brew temperature ...
    Thanks for that.

    Does this mean that a single boiler e61 machine does not require the use of a cooling flush if the machine has been sitting idle for an extended period because the water should always be sitting at brew temp?

  6. #6
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    Re: E61 Group Head for non-HX machines

    Quote Originally Posted by 202728253F3627283235460 link=1252111473/4#4 date=1252204175
    Does this mean that a single boiler e61 machine does not require the use of a cooling flush if the machine has been sitting idle for an extended period because the water should always be sitting at brew temp?
    Correct- assuming it has been Scaced to set it correctly. A whole heap of vendors dont bother doing this....

  7. #7
    Senior Member GregWormald's Avatar
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    Re: E61 Group Head for non-HX machines

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    Quote Originally Posted by 212629243E3726293334470 link=1252111473/4#4 date=1252204175
    Does this mean that a single boiler e61 machine does not require the use of a cooling flush if the machine has been sitting idle for an extended period because the water should always be sitting at brew temp?
    Id say "both yes and no". The water in the boiler might be the right temperature for brewing, but the group etc. will likely be cooler and so the machine may need a heating flush for the first coffee after idling, but succeeding cups are OK.

    If the boiler is set so the first coffee is right without a flush, then the succeeding coffees in a run may well be too hot.

    Keeping everything at the correct temperature for both idling and running would be very difficult, especially when the difference between too hot and too cold could be as little as 2C.

    Greg



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