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Thread: Commercial Machines - Dual Boiler or Heat Exchanger?

  1. #1
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    Commercial Machines - Dual Boiler or Heat Exchanger?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi CS

    I have a question for those that have worked or do worth with commercial multi group head machines.

    I was under the impression that all commercial machines would be dual boilers, but today whilst chatting to a friend at our church. Was told that the coffee machine they are using is a heat exchanger?

    Now is that correct? The machine is new (wouldnt be older than 2 years i would say).


    Any info would be great.

  2. #2
    Senior Member Barry O'Speedwagon's Avatar
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    There are plenty of commercial multi-group HX machines.

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    Thanks Barry,

    With that said, are HX machines able to control water temperature to the Group heads any different to the DB's?

    Id assume this would be controlled by the PID?

    Practically speaking though, is there any major difference between pulling a shot on a HX based machine vs a DB machine?

  4. #4
    Senior Member summercrema's Avatar
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    Just another question do they(commercial HX or dual boilers) have any build in energy efficient features ?

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    Senior Member chokkidog's Avatar
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    Quote Originally Posted by ggoosen View Post
    Thanks Barry,

    With that said, are HX machines able to control water temperature to the Group heads any different to the DB's?

    Id assume this would be controlled by the PID?

    Practically speaking though, is there any major difference between pulling a shot on a HX based machine vs a DB machine?
    The vast majority of commercial machines are single boiler HX's.
    There is very little difference between the temp management and stability of an HX vs. a PID'd machine. The deadband on a PID should be tighter
    than a pressurestat but not by much. The main difference is the ease of adjustment with a PID as it is (normally) easily accessed. A pressurestat
    requires getting into the machine and making adjustments while the machine is on. PID machines are rarely used to their full extent and are normally set at a certain
    temp and left there. Not a lot of temp surfing going on once things are set up and working.

    There is no difference (but sometimes imagined) in shots pulled from either an HX or Double/Multi Boilers, pressurestat or PID, when the machines are being managed correctly.
    There are too many other variables at play, including the mug on the end of the group handle, to make a discernible difference.

    Quote Originally Posted by summercrema View Post
    Just another question do they (commercial HX or dual boilers) have any build in energy efficient features ?
    Yes there are a few coming onto the market now. Astoria make one. The power saving/efficiency modes that are available are often controlled by microchip stuff that can put
    the machine into idle at times of low use and things like that. Boiler insulation is also becoming more common. Whether or not 'green machines' save enough carbon to
    offset the manufacturing carbon footprint of energy saving devices is another matter.
    Last edited by chokkidog; 17th September 2015 at 03:53 PM.

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    Senior Member LeroyC's Avatar
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    It seems that recently people have come to the conclusion that HX machines are inferior to multiple boiler machines. Why is this? Is it simply because they are a newer concept and therefore considered better (latest-and-greatest mindset)? You don't have to dig too deep to find that this simply isn't the case. When selecting a coffee machine for any purpose you need a list of things you require from it and you then select the machine that fits those requirements best. Whether it has a HX or multiple boilers is just one of many features that will go into the mix. Build quality and performance are the most important things to look for I would think.
    Dimal and chokkidog like this.

  7. #7
    TC
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    Behmor Brazen - $249 - Free Freight
    Many who are new to espresso equipment do not understand what a heat exchanger is and/or how it applies to espresso machinery. 90% of our enquiries on multi boiler machines are from clients who simply want cafe at home: i.e simultaneous shot and steam. When a heat exchanger machine is explained to them, in the majority of cases, that's exactly what they want! Our buyers guide is often of assistance: Buying Guide- Espresso machines | Talk Coffee

    Chris
    chokkidog and ggoosen like this.



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