How It Works: Bezzera BZ Group

Learn how to BZ group head works on Bezzera espresso machines. This applies to the Bezzera BZ07, BZ10, BZ13 PM, BZ13 DE, Matrix DE, and Duo DE.
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[@qwe7410]

There's no thermosyphon system on the BZ which circulates water from the boiler to the grouphead. This is a plus as it means there are two less paths that will cycle water and two less tubes for limescale to choke up causing issues. The start up time is reduced from 30 minutes to 10 minutes on a 2litres boiler. A thermosyphon system can be very unstable with very small boilers, particularly if it's below 3litres and the bigger the boiler, the more energy and start up time is required. These BZ groupheads are so much cleaner and require much lesser pre-infusion.

[@erlynlopez9731]

Your videos are really good with lots of information. Keep it up, looking forward next video.

[@Wholelattelovepage]

Hi EL, Will do and thanks for the comment!

[@cherylschwarz3950]

Great demonstration!

[@Wholelattelovepage]

Hi Cheryl, Thanks for taking a moment to leave the comment!

[@michaelsmith6094]

Love these videos!

[@Wholelattelovepage]

Hey Michael, Glad you like them - more to come!

[@back_to_the_bike8820]

thank you 👍

[@Wholelattelovepage]

Welcome 👍

[@victorsangco1420]

I have BZ16 DE, i hope u have some video of it like the BZ13, so i can fix it myself. Thank you! Good content. Btw

[@Wholelattelovepage]

Hi Victor, Thanks for the comment and request. I do not currently have a BZ16. If/when I do I will make similar videos.

[@kennykong6330]

I'm a ECM guy but love to watch these videos to educate myself on the different machines and see how they work. Can't help to notice the ECM tamper and leveler on the back of one of your machines there. :-D

[@Wholelattelovepage]

Hey KK, Thanks for the comment. We of course love doing these! Used the weight of the ECM gear to trick out the pressure switch for the water reservoir.

[@nazr3867]

Are these interchangeable/ same concept with the Crema PID?

[@paarpeter5528]

Hi. Thank you this videó! i hope you can help me. I have a Bezzera duo de. I set the temperature in the coffee boiler to 96 degrees (maximum), but a maximum of 87 degrees water comes out of the head no matter how long I heat it. Coffee taste no good, no body, sour.. The machine is two years old and the inside is clean. it was always used with filtered water. Where should I start the search? Thank You!

[@mwoolnough]

Thanks for the video, appreciate you guys taking the time to put this content together - great for understanding the machine in more depth! Just a quick question - I have had concerns about the vacuum valve venting into the machine and messing with the electrics/insulation and I noticed in this video that you have a piece of tubing over the vacuum valve/breaker (can be seen at 3:45) which I assume would direct any steam upward toward the drip tray and away from internal electrics of the machine? I'm just wondering what size tubing this is and what sort of material it is? I would like to avoid having to pull the machine apart and replace the vacuum valve with on that has drain barb to redirect the water to the drip tray (which I know others have done to address this flaw in the design). Thanks in advance!

[@Wholelattelovepage]

Hi m, You're welcome for the video and thank you for your comment and question! The extra tube does help contain and direct water vapor upwards. Unfortunately I do not have a machine in front of me so cannot measure size. The material is likely silicone tube. I understand your desire to route moisture outside the machine. While that's a design I prefer, understand very little moisture exits from the vacuum relief valve before it closes. While I've seen tiny water droplets spit from vacuum relief valves just as they're closing it's so little they evaporate almost instantaneously and vapor is carried away without compromising electronics.

[@mwoolnough]

@@Wholelattelovepage Thanks for the reply!

[@mgp-bct7723]

Just bought this one ☝️ from you guys lol 😝

[@despostizzz]

Thank you. Great video. So should be easier to maintain compared to a traditional E61 , quicker to heat up but no mechanical pre infusion, right?

[@Wholelattelovepage]

Hi d, Yes, quicker to heat up, no mechanical pre-infusion and a bit less maintenance with no internal moving parts.

[@ajillian1]

Such a simple design yet people swear by the e61 group which has probably quadruple the amount of parts and complexity to it. I've read somewhere that the e61 pulls a more full bodied shot but the BZ group has greater clarity. Not sure how that effects taste.

[@Wholelattelovepage]

Hi a, Thanks for the comment! Taste judgements are subjective and with the number of variables involved difficult to attribute directly to the group design. The E61 has more going on mechanically while the BZ group has more electric components with group heater and solenoid.

[@rafaelrgbarrocas]

As always great videos, full of information! A key issue for me is the warm-up time, so I ruled out the e61 group. So the bz group is a great alternative. but have doubts about the warm-up time of the BZ DUO, because in one of the WLL videos it is mentioned that the warm-up time of the bz duo is similar to the e61 group. this is true? another question is about the temperature stability of the BZ group in relation to the Profitec pro 300. which one do you think provides better temperature stability?

[@rafaelrgbarrocas]

I mean brew temperature stability..

[@RocMediaTechnologies]

Hi Rafael. I’ve personally never timed the full heat up side by side between a Duo DE and comparable E61 but the E61 is heated by the water in the brew boiler alone vs the BZ being heated by the internal group heater. Heat up time for the boilers themselves is pretty comparable. It’s the thermal siphon of the E61 that makes full stability take longer, so I’d have to say the BZ has an advantage there. The Duos ability to schedule on/off and eco mode could also assist in reducing your wait time for temperature stability. Hope that helped a little:)

[@rafaelrgbarrocas]

@@RocMediaTechnologies thanks so much for your attention and enlightening answer!

[@Wholelattelovepage]

Hey Rafael, Thanks for the question. In 2018 I did some testing of heat up times, temperature stability and steaming performance comparing PID machines with BZ group and E61's. I used a Bezzera BZ07, Profitec Pro 500 and Rocket EVO in the comparison. Long story short the BZ group attained temperature stability 20 minutes faster than the closest E61. All machines compared did well in temperature stability. Here's a link to graph of warm-up times test results within the video: kzbin.info/www/bejne/iJ-UhGVppayDn7M Here's a link to our 2016 review of the Pro 300. In the video we do Scace brew temp test and got +/- 1F accuracy and 10 minute heat up times: kzbin.info/www/bejne/qoK7nmVrpbKLmtU Hope that helps! Marc

[@rafaelrgbarrocas]

@@Wholelattelovepage Hello Marc! Thank you so much for your feedback and clarification. You and WLL team are amazing! WLL videos are concise, pleasant to watch, full of information and approach the equipments independently, respecting your suppliers! Congratulations on the competence and professionalism of the WLL team!

[@WISE416]

Hey! Hoping you can help. I have a Bezzera hobby machine and I just replaced the gasket with one of your caffe works ones, cleaned out the group head, lots of components were covered in black sludge (that I thought was coffee residue). But now I’m noticing water leaking from the plate that the shower screen attaches to, that then screws into the group head. Both surfaces are clean but it’s a metal on metal contact, do I need to use grease on it? Thanks so much

[@Wholelattelovepage]

Hi WISE, You can but a very light coating of food safe lubricant on the gasket shown at this point in the video: kzbin.info/www/bejne/eH-wmYZ5qaionLM Also be sure the gasket is there and in good shape!

[@andersbjrnskov8130]

And what about the return of water when you stop the brewing? I mean the exessive water over the puck?

[@RocMediaTechnologies]

Hi Andres, The brew solenoid is a 3 way valve. The excess pressure and water is vented from there down to the drip tray.

[@Wholelattelovepage]

Hi AB, AS @Brian commented the machine has a 3 way solenoid valve in the brew circuit to release excess pressure and water from the group.

[@hizkiakumaat2206]

So there is no water circulation like in e61 group head in this bezzera group head?

[@Wholelattelovepage]

Hi HK, That is correct.

[@jannetuominen3014]

Nice vid! Can anybody tell is it possible to move BZ40 pm to DE volymetric version? Their differences are only few parts, electronics and volymetric meter but I don't want to start project if it have to risk that the new parts no fit to Pm model.

[@Wholelattelovepage]

Hi jt, Thanks for the comment. BZ40? Must be an older model I'm not familiar with. In more current Bezzera machines DE versions use the BZ Group and MN versions use an E61 Group with manual lever. Again I'm not familiar with the BZ40 but in more recent machines I would not advise attempting - to many differences in group mounting, hydraulic/plumbing and electronic systems.

[@jannetuominen3014]

Thanks to reply. As I said, Mp and de is the same machine which differs only electronic box and volumetric dosing sensor. Both have same boiler, bump and double heaters - one from boiler and one which heating grouphead. Thanks anyways. You are right that if I can't find some sure answers that adding the feature is possible, it is silly to start ordering high pricing parts etc.

[@SonnyMagon]

Is the exposed screw unique to the BZ grouphead? I find it keeps bending my puck screens (even the 1mm screens). Any suggestion?

[@Wholelattelovepage]

Hi SM, Some groups have them like many ring boiler groups, standard E61 group does not. Sounds like if you were not using a puck screen you would be leaving an impression of the screw and maybe the group's shower screen in your puck? If so, that's indication of too much coffee in the filter basket. Suggest a larger filter basket to accommodate your dose or reducing dose.

[@SonnyMagon]

Ok sounds good. The thing is I am using the stock Bezzera portafilter with double basket - approx 18-19g of coffee. I would assume that is ok given it’s the double basket. Does Bezzera make a larger basket?

[@jooger69]

When are you going to show us a cutaway of the bz group?

[@Wholelattelovepage]

Hi j, will see what we can do. You must have seen our cutaways of E61 groups!

[@calvintran8691]

almost bought the bz13 but it was out of stock and the tubes are concerning

[@Wholelattelovepage]

Hi Calvin, BZ13 is a rather popular machine and often sells out. Expecting new stock soon. Not sure what tubes are concerning you.