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Thread: Warming up espresso machine

  1. #1
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    Warming up espresso machine

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi all!

    I work in a cafe. At the start of the day, Ive been informed its best to run water from your group heads/hot water spout to re-fresh the boiler - how long should this be done for? Also, for how long should someone run through shots to get the machine up to the correct temperature for service?

    Thanks for any and all help :)

  2. #2
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    Re: Warming up espresso machine

    Hi Sparrow,

    Welcome to Coffee Snobs!

    The water that comes out of the heads doesnt come from the boiler in a standard HX commercial machine. The only water that comes from the boiler is from the steam wand and the hot water tap.

    The boiler will heat up quicker then the group heads so by running water through group head then the machine will be up to temp quicker. Every machine is different so the time to heat up will vary.

    But most machines will warm up in 30 mins without the need to flush water through the heads. So when you walk through the door in the morning turn on the coffee machine first.

    Cheers

  3. #3
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    Re: Warming up espresso machine

    Quote Originally Posted by 5152404044524A330 link=1287994060/1#1 date=1287994888
    The water that comes out of the heads doesnt come from the boiler in a standard HX commercial machine.
    Perhaps the question that needs to be asked is what type of machine it is. *A lot of commercial machines have dual boilers so in these cases a flush would be needed to cycle the water. *Perhaps I have understood dual boiler systems but I always thought they didnt use a heat exchanger system.

    I recall one of the criticisms of dual boiler machines is that you need to be cycling the water in the brew boiler regularly. Water that remains at high temp for extended periods tastes flat. Since HX machines use fresh water instantly heated in the heat exchanger their water is always fresh and arguably better for low volume environments.

    I think the short answer is it wouldnt hurt what ever system you are using.

    JB

  4. #4
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    Re: Warming up espresso machine

    I could be wrong as I havent pulled a multi boiler apart but I thought that the brew water doesnt come from the boiler.

    Two pics, a LM saturated head showing the brew water pipe and a pic of a Expobar G10 multi boiler; still a HX.




  5. #5
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    Re: Warming up espresso machine

    Welcome to the gang :)

    Apart from what machine is it? You should be using up some shots dialling in the grinder for the day anyway and tasting one or two to see how they taste. Running a little through the groups also helps speed the heat up time a little. By the time you have done a bit of this any flushing should be done.

  6. #6
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    Re: Warming up espresso machine

    I thought the hot water comes through that little copper tube. The sleeve around the whole head is connected to the thermo syphon which I thought was a different circuit to the HX. The HX is coiled up pipe in the middle of the boiler. Cold water is pumped through that and heated instantly and from there would come out of the pipe pictured in the group head if it was an HX machine. I think in this case that pipe connects straight to the brew boiler which of course is the tiny one.

    Of course I could be totaly wrong and look like a complete twat after commenting as though Im an expert.

    Sorry for the off topic posts Sparrow

  7. #7
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    Re: Warming up espresso machine

    Hi again all!

    Its a La Morzocco machine, cant quite remember the model though? Will have to check that.

    Regarding warming up the group heads, I do several shots in the morning in order to test and adjust the grind. However, something someone told me was that in order to get the group heads up to the correct temperature (ie. between 88 - 95 degrees C) one should do many short shots, up to half an hour, before service.

    Has anyone else heard of this before? I run a number of shots through and play with the grind which in total takes no more than 10 minutes (unless the grinder has been thoroughly cleaned the previous afternoon, where someone has pulled it apart and has missed the mark with getting it back to a similar position as before).

    Another question I have regarding this machine: At times, my shots will be running well as usual, and then Ill try and do an extraction and suddenly all Ill get is dripping, and then halfway through an absolute gush. And this may happen a few times until it goes back to a good flow. And Ill be tamping the same etc - like its more of a machine nuance. Whats the reason for this, and is there a way I can control this? It might only happen twice a shift, but Im curious why it happens at all!

    (I may need a separate post for that Q, but Im hoping you guys can help me with this :)

    Thanks a lot!!

  8. #8
    Senior Member Dennis's Avatar
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    Re: Warming up espresso machine

    Quote Originally Posted by 4F6C7D6E6E736B1C0 link=1287994061/6#6 date=1288078802
    Regarding warming up the group heads
    I dont turn off my machine, though suggest once youve turned yours on, run a few flushes through once its up to temp. The group temp should be hot enough after 30-40 minutes.

    Quote Originally Posted by 4F6C7D6E6E736B1C0 link=1287994061/6#6 date=1288078802
    At times, my shots will be running well as usual, and then Ill try and do an extraction and suddenly all Ill get is dripping, and then halfway through an absolute gush.And this may happen a few times until it goes back to a good flow.
    Are you using the LM baskets that came with the machine? They are a pig - dose or tamp incorrectly and youll get immediate channeling.


  9. #9
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    Re: Warming up espresso machine

    Behmor Brazen - $249 - Free Freight
    At both places I work, the LM machines are usually left on .........but the other morning one was off so I had to turn one on for some reason. 3 group Linea took 30mins to get full steam and the groups seemed at the right temp.

    I reckon wait 25- 30mins, run heaps of water through each group, do a seasoning shot on each group, (The groups are cleaned the night before right?), dial in the grinder, make yourself a coffee and you are ready!




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