How it Works: Deep Inside a Cutaway Espresso Machine

[@al-wilsonalino6091]

This video helped me get a job as a coffee tech. Now i have been fixing machines for 3 years! Thanks Guys!

[@Wholelattelovepage]

Hi AA, That's awesome! Happy to help and hope you are enjoying your profession! Marc

[@al-wilsonalino6091]

I am loving it. I'm based in melbourne and im planning to sell refurbished machines in PH. hope all goes well! Thanks heaps guys

[@JoeySchaefer64]

PHENOMONAL EXPLANATION!! Lots of similar videos have gone over my head, but this one really answered some questions and diminished the fog. Nice work, Marc and Todd!

[@Wholelattelovepage]

Glad you enjoyed it and thanks for the comment! Marc

[@richykim4868]

The two of you guys make the best technical espresso machine videos.

[@charithdayantha]

the only video in the youtube which describe the coffee machine at the time

[@Wholelattelovepage]

Hey cd, Thanks for the comment!

[@TheEndofThis]

I would buy an espresso machine from this man

[@PeaceChanel]

Thank You Everybody for All that you are doing for our Planet Earth.... Peace.. Shalom.. Salam.. Namaste .. 🙏🏻 😊 🌈 ✌ 🌷 ☮ ❤🕊

[@40mmmikemike]

I know about solenoids from working on paintball guns, it was cool to see it turned on like that and the electric buzzing sound. I have a cheap breville cafe roma machine that I haven't used in a few years and I worry about corrosion inside it or deterioration of parts and seals. I ran a cup of vinegar mixed with a cup of water through it and then another few cups or so of plain water to clear the vinegar out, hopefully that will be enough and it's safe to use. The machine is about 5 years old. Having seen the inside of some nasty kettles I hope it's not too bad.

[@Wholelattelovepage]

Hi 40, thanks for sharing and good luck with the Cafe Roma.

[@ThePilot_USA]

That IS rocket science to me.... Great lesson!

[@Wholelattelovepage]

Glad you liked it!

[@himesjon]

This dude loves his job

[@StephenEBall]

Very good teaching!!! Thanks for the absolutely wonderful explanation.

[@Wholelattelovepage]

Hey SEB, You're very welcome and thanks for the comment!

[@Delmar829]

Thank you for doing this. A very well informed instructor.

[@Wholelattelovepage]

Hi D, You are welcome and thank you for the kind comment.

[@mikeausmunchen4211]

Thank you for making this outstanding explanation video and all the effort you've put in the cut model.

[@Wholelattelovepage]

You're very welcome!

[@nightshift4587]

This was a great 17min + video. Thank you for making and sharing this.

[@Wholelattelovepage]

HI, You are welcome and thank you for taking a moment to leave a comment! Marc

[@jasonkarriker3134]

Wow! Amazing explanation every single detail.

[@Wholelattelovepage]

Hi JK, Thanks for the comment!

[@inferno493]

Really great video, although I believe there is one small error. The top of the bottom chamber is for pre-infusion. It uses a low pressure spring to allow water to flow into it at the same time that the portafilter is building pressure and prevents the coffee from receiving a sudden burst of pressure. When you lower the lever fully, it opens both chambers, allowing the preinfusion chamber to drain so it can be used for the next shot. The lower valve uses a much higher tension spring so that it would only open on it's own in the case of excess pressure in the grouphead.

[@richardau7580]

Correct!

[@alunroberts1439]

Excellent description.

[@Wholelattelovepage]

Glad you enjoyed it

[@alunroberts1439]

@@Wholelattelovepage am working on one my self needs a good clean. The motor has given in won't turn the pump as was lime scale in it changed pump did not help all runs ok on a drill so waiting for a new motor.

[@bigmedge]

This is a great tutorial !! But are you guys planning to make a video about the circuit paths/components of the power board ? Like which the power paths within the circuit , PCB components that frequently malfunction , symptoms of each malfunction , & how to troubleshoot them with a multimeter ?

[@Wholelattelovepage]

Hey b, Thanks for the comment! We have a variety of support videos including some on electronics. Those are machine specific so best bet is to go to our support section here and search by brand and then the machine you are interested in: support.wholelattelove.com/hc/en-us

[@houshanghemmaci618]

Thanks It is very good for me .You show inside of machine and how actuator work together

[@miguelangelmichelruggerio1128]

amazing piece of art .

[@Wholelattelovepage]

Hi Angel, Thanks for the comment!

[@abdullahali5999]

Brilliant, I have been really looking for such a video for ages. Respect for all the team.

[@Wholelattelovepage]

Hey aa, Marc here from Whole Latte Love... Happy you found the video and thank you for the respect!

[@chairattangthong]

I just understand how espresso machine works, this is very good video sharing Thank you very much sirs.

[@bobbuell5968]

cut-aways are the best

[@Wholelattelovepage]

Yes they are! Thanks for the comment Bob!!!

[@rodsnyder6020]

That was so awesome! Thanks a lot for these deep insights here! Learned a lot watching this. Thank you guys!

[@Wholelattelovepage]

Hi Rod, You are welcome and thank you for taking a moment to leave your comment! Marc

[@szesccztery]

Hi guys, thanks for the great video, I really appreciated it. Did u know, that the pressure chamber below the valve has a prebrew-function? Starting the process by pulling the lever in the up-position, the upper chamber will be filled with about 9 bar pressure, and opens the lower chamber at about 2 bar. The water drains and soaks the coffee at about 2 bar until the lower chamber is completely filled. After this, the full pressure of about 9 bar will reach the coffee and the extraction will start. Cheers from Germany! Gregor

[@Wholelattelovepage]

Hi Gregor, Thanks for the comment! Yes we use that on rotary pump and plumbed machines from ECM and Profitec to do a true line pressure pre-infusion.

[@saidaksas928]

Hi Gregor thanks for the Info, any idea on how to learn more about fixing coffee Machines, would like to do this as a job Please advise

[@headoverbars8750]

Wow...I get some new projects with a nice little raise on the horizon and not only have I purchased a new espresso machine in my head, but now I am servicing it already Lmao... Focus! I still need to work on getting that grinder!

[@Wholelattelovepage]

Sounds great!

[@AbuSalem2099]

thank you for your valuable video. i am an engineer whos starting to study espresso machines to make my own top notch one, and maybe open my company sometime later when i master the craft.

[@Wholelattelovepage]

Hi AS, Thanks for the comment. If you like this video you should enjoy this newer one with cutaway models of toher Espresso machine boiler types: kzbin.info/www/bejne/hYbcqKKIqJmgm7s Marc

[@AbuSalem2099]

@@Wholelattelovepage Hi Marc, Already did, i am honored talking with you.

[@golfbofai]

from Thailand thank you for knowledge thank

[@Wholelattelovepage]

You are welcome and thank you for the comment!

[@GC-fb5qb]

Wow awesome video that is so informative, thanks for the effort in making this video, the engineer in me loves to understand how all the items function as a complete system. Also shows the quality of the parts used by ECM

[@Wholelattelovepage]

Hi Glenn, You are welcome and thanks for the comment!

[@정재훈-b8f]

such a great video I have ever seen. I need this kind of videos as I really want to study about espresso machine. Thank you so much for nice information!

[@Wholelattelovepage]

Hi thanks for the comment and you are welcome. If you want to learn more about a variety of machine be sure and check out our other videos and our support wiki which has manuals, diagrams and more for most popular espresso machines. It's available here: wiki.wholelattelove.com/Main_Page Marc

[@ronstar8857]

Thank you both for an outstanding "learning" video. Excellent inside review of the workings of a espresso machine. Great to know how things work! Cheers, gents!

[@Wholelattelovepage]

Hi Ron, You are welcome and thank you for the comment!

[@44Bigs]

Great video! I finally understand what’s going on in my Bezzera Mitica.

[@Wholelattelovepage]

Great to hear! Thanks for the comment.

[@katakis1]

Fascinating stuff.

[@mrpeterpotts5106]

Interesting demonstration of how people who know intricate details do not the best teachers make.

[@Wholelattelovepage]

Lol

[@caffhuang]

Really great video love it!

[@Wholelattelovepage]

Thanks so much!

[@murphyrp01]

Great video team. Very explanatory.

[@MrStinkystink]

Great video and helpful in understanding the operations of E61 and other general machines

[@Wholelattelovepage]

Hi Chris, Thanks for the comment! Marc

[@matthiasmartin1975]

This is brilliant! Thanks, now that I know what all that stuff does I stand a chance of repairing it. Mine has a ruptured heat exchanger, no wonder it didn't work properly. I had a hunch that I was dealing with a heat exchanger, but having certainty gives me great peace 😉.

[@Wholelattelovepage]

Hey MCB, Thabks for the comment and good look with repairs! Marc

[@HiiImChris]

The magnetic component is cool

[@CorrupteddSanity]

you guys are an institution on this subject - thank you

[@Wholelattelovepage]

Hi h22, You are welcome! We do our best. Thanks for taking the time to leave a comment! Marc

[@longfade]

Wow, what an ingenious system.

[@Wholelattelovepage]

Hi Zach, Thanks for the comment! Marc

[@caidenleyva4056]

Could you guys ever do this for the gaggia classic pro?

[@Wholelattelovepage]

Hey c, While I don't have a specific "How It Works" for the GCP we do have a full boiler rebuild video, 3-way solenoid clean/replace and many more maintenance and repair videos which go inside the machine. Those are all accessible at our support page for the GCP located here: support.wholelattelove.com/hc/en-us/sections/1500000384362-Gaggia-Classic-Pro

[@dhammadiipa]

Appreciate your work

[@Wholelattelovepage]

Appreciated

[@cristianiuhas4079]

Great video! LOVE my Rocket, finally know how it works...

[@Wholelattelovepage]

Hi CL, Thanks for the comment!

[@TINGSTARR]

Todd and Mark, great video as most of yours are. I'm very glad I came across this one in particular which gave a me a greater understanding of the internals (I'm a car guy as much as an espresso guy - gear-head as they say). Love how this evokes the Audi/Lamborghini partnership. German engineering / Italian flare. Thanks again!!!

[@Wholelattelovepage]

Hi T, You are welcome and thanks for the comment! I (Marc) am a car guy too! Although more of the American muscle car variety.

[@TINGSTARR]

Whole Latte Love Marc, I also have a 1999 SVT Cobra which is my pride and joy. And it's a convertible. I love to bring it to cars and coffee events. Now that's living, right?

[@gottahavegoalsset]

So amazing and impressive.

[@Wholelattelovepage]

Thank you! Cheers!

[@cwsears]

Fabulous walk through under the cover of the Technika, thanks for this video. It's very helpful to have a better understanding of how things work.

[@tarikabderrahim9442]

Very well explained. Great job

[@Wholelattelovepage]

Hi Tarik, Thanks for the comment!

[@riskihdi392]

From Indonesia,terimakasih telah berbagi pengetahuan

[@Wholelattelovepage]

Hi le, Anda dipersilakan dan terima kasih atas komentarnya! Marc

[@BillyBobpeeps]

Brilliant vid, full of detail and exceptionally well presented, many thanks. The capacity, guesstimating, of the heat exchanger and associated piping, could be less than 300ml. Using a short purge and pulling one shot would use approx 100ml. Cold water fed by the pump would replenish this. This would suggest that the temp would take a nose dive, during and for some time after the shot. Reheat might take some time as there are no fins on the exchanger. Do you have any figures on this, please?

[@Wholelattelovepage]

Hi BB, Thanks for the comment, question and request. If you like this video you'll love this newer one with a look inside cutaways of single, HX and dual boilers: kzbin.info/www/bejne/hYbcqKKIqJmgm7s Reheat times are fairly quick, in most HX machines you'd be all ready to go by the time you prepped the next shot. Large thermal mass with water in boiler and the 6 or so pounds of metal in the group. Marc

[@mgp-bct7723]

Wow you guys are the best one sow far how many I seen only u the guys explaining everything teaching everything :) Nice 👍 thanks 🙏

[@Wholelattelovepage]

Our pleasure!

[@sylc9161]

Excellent videos to learn about anything coffee

[@CorrupteddSanity]

Good job, Todd! Very clear.

[@Wholelattelovepage]

Thanks!

[@skyltdockan]

Is the coffee put under the full 9 bars of pressure?

[@Wholelattelovepage]

Hi s, Yes, these machines do 9 bar and it's adjustable if desired.

[@natsoray]

This is so cool! It's really interesting how straight-forward and simple the actual mechanics of this machine are. For some reason I always imagined these machines to be much more complex.

[@Wholelattelovepage]

Hi natsoray, Thanks for the comment. I will say ECM machines tend to be some of the most straightforward under the hood. Well engineered using the K.I.S.S. principle! Marc

[@s0ccerFreakTT]

you should do the same thing using an entry-level model

[@Wholelattelovepage]

Hi zg, We have some videos featuring internals of premium entry-level machines like the Gaggia Classic. Here a video showing a complete rebuild of that machine: kzbin.info/www/bejne/hGrMXnh-bNaLhcU Marc

[@hizkiakumaat2206]

Thank you for the video. But, how much water in the heat exchanger? Is the heat exchanger path is always full of water?

[@Wholelattelovepage]

Hi HK, You are welcome. Heat exchanger is always full of water and once heated up is constantly circulating water out to the E61 group head. Marc

[@douglasmaclean5836]

that was absolutely awesome, thanks !

[@Wholelattelovepage]

Hi DM, you’re welcome. Thanks for the comment and glad you enjoyed! Marc

[@baswouwenaar8530]

Great video. However you didn’t explain the preinfusion chamber. The top spring on the release end of the grouphead opens at about 1,5 atm allowing the chamber to fill resulting in some time before the pressure on the puck builds up to full brewing pressure. This is one of the unique design features of the e61’s patented design.

[@AlienOne2]

Thanks for sharing, very helpful but my machine is slightly different. Would you happen to have a video on how to replace the non-return valve on "Rocket Mozzafiato Type V"?

[@Wholelattelovepage]

No, sorry

[@wursthans5921]

Thanks for the explaination. Good work!

[@Wholelattelovepage]

Hi WH, Yopu are welcome and thank you for the comment!

[@Paddington2000]

Great video, thanks!

[@Wholelattelovepage]

Hi Harvey, Thanks for the comment! This is the stuff we like doing the most.

[@01cortese]

well done guys

[@Wholelattelovepage]

+paolo cortese Hi Paolo., Thanks for your comment!

[@pederkimlunding3352]

From Denmark - thank you for a fantastic stream. Really cool and informative😉😄

[@Wholelattelovepage]

Hi pdk, Glad you enjoyed it and thanks for the comment!

[@beck007able]

Beautiful piece of machinery!! Why can all brewing machines be made this serviceable!! Oh yeah, everyone wants them cheap!!

[@tdaiuto]

Great Video. Just purchased the Mechanica V Slim. My biggest issue with the design is the lack of drainage for the Anti vacuum valve. The amount of water that leaks prior to a seal can't be good for the electronics inside the machine. I've noticed that other machines have the new type of vacuum valve that takes the excess water to the drain tray. The Profitec Pro 600 comes to mind. Is it possible to modify machines that don't have this using the new style valve? Maybe cut into the drain tube for the expansion valve and splice in the tube for the vacuum valve?

[@Wholelattelovepage]

Hey Todd, thanks for the comment and question. I don’t see a reason why you could not do that. Many machines use a T into the line going to the drip tray. Like you I prefer that setup. That said, it’s a very small amount of moisture released from the open relief valve, the boiler is hot so it evaporates rapidly and convection rapidly moves the water vapor up and out of the machine. If you decide to route to drip tray be sure the tube off the VR valve doesn’t get kinked. Kinks can prevent the VR valve from closing by causing back pressure on the valve. Marc

[@beaurice909]

very nice video man seriously

[@Wholelattelovepage]

Hi Egli, Thanks for your comment we seriously love getting the a whole latte! If you like this video, we have a similar one coming out in the next day or so featuring a cutaway Profitec Pro 700.

[@davidkennerly]

Is that Kevlar wrapped around the tank? I would have to guess that it is a safety measure to prevent an uncontained, over-pressure explosion, like a jet engine nacelle.

[@Wholelattelovepage]

Hi David. Does look like kevlar but it's not. Just a high-quality jacket around insulating material. Boilers are protected from bad things happening by thermal safety switches and/or relief valves.

[@DavidFederLimitlessGuitar]

This is great! Do you have a teardown video for the Isomac Milano?

[@Wholelattelovepage]

Hi DF, Sorry we do not.

[@DavidFederLimitlessGuitar]

@@Wholelattelovepage OK Thanks

[@ThingEngineer]

Amazing machine for such an amazing product! Thanks for the awesome teardown and explanation.

[@Wholelattelovepage]

Hi Josh, You are welcome and thank you for the comment!

[@jekciso]

Nice piece of engineering, but could that contraption can be easily replaced by an overhead reservoir?

[@Wholelattelovepage]

Not sure we fully understand the question. Do you mean overhead such that it could be gravity fed? At some point a pump is required to create the ~9bar pressure used in the espresso brewing process.

[@PacoOtis]

Dudes! Excellent! Thanks for the video and we definitely owe you a beer, I mean brew!!

[@Wholelattelovepage]

Hi JS, You are welcome and thank you for the comment! And I'll take the beer!!! Marc

[@jensbaufeldt7543]

Fantastic educational

[@Wholelattelovepage]

Hey Jens, Glad you enjoyed it! Here's another that's very similar which takes you inside the 4 types of boilers used in most espresso machines: kzbin.info/www/bejne/hYbcqKKIqJmgm7s Marc

[@graphene1487]

played at .5 speed is a stoner's paradise. Real trip.

[@Wholelattelovepage]

OMG, bringing back high school memories - thanks! Marc

[@graphene1487]

@@Wholelattelovepage like the Magic School Bus mannnn 🧙‍♂️🥬🔥

[@showoffvideo]

Pretty sweet video. Makes me sad my machine lacks a few of these features. The only thing I’m curious about is the temperature of the heat exchange. I thought heat exchange units keeps 2 temperatures. But here brew water heating up the brew head and then going through the coffee isn’t temperature controlled/monitored? Edit: I think I figured it out. Main boiler is temperature controlled at steam/hot water temp and pressure. Heat exchange inside cycles outside the boiler into the group. But the speed of the pump pumping the water out and back in from the heat exchange loosely controls the temperature to be cooler than boiler temperature.

[@Wholelattelovepage]

Hi James, Thanks for the comment! Very close to correct on your edit. Here's what's going on: Water circulates from the heat exchange section inside the boiler out to the brew group and back. No pump involved in making that happen just thermodynamics in the thermo-siphon loop. Most E61 group machines uses a flow restrictor which controls the flow rate of the thermo-siphon. Changing the opening size of the flow restrictor affects the temperature of the group. Most heat-exchange boiler machines require a short cooling flush prior to brewing to get rid of over-heated brew water. There are a number of newer HX machines with PID temperature control which do not require cooling flushes. PIDs give very accurate in boiler temperatures. Manufacturers can then engineer the thermo-siphon with a flow restrictor sized to produce a certain brew temp say 200F even when the main boiler is running in the 260'sF.

[@MathewClips]

Ahh now I will fix my espresso machine... Y'know if I had one ( Pretty cool though )

[@Hihijjp]

I still don’t understand how the coffee water goes through the tiny hole in the handle thing where you actually put in the coffee! Why is there literally no video explaining this part! 😂

[@hassanalsebaa]

Thanks for the video. If I use meter on 2k ohms setting to test the solenoid will enough?

[@AndreasZimmerman]

This has helped me so much

[@Wholelattelovepage]

Hi AZ, Thanks for the comment! Marc

[@alikale4851]

Thank you for information

[@Wholelattelovepage]

Any time

[@MatthewFura]

Nice. That's my machine!

[@Wholelattelovepage]

Hi Matthew, Thanks! A very nice machine!

[@alylyshua74937]

Now I'll be able to make my machine out of spare parts yay !

[@Wholelattelovepage]

Hi J-SD, That's a lot of spare parts!

[@wearashirt]

is the cam accessible at all, for example during a total cleaining and rebuild of the e61 system?

[@sidrungkapun2082]

thanks for this helpfull video

[@Wholelattelovepage]

Hi JC, You are welcome and thanks for your comment!

[@payamirani5298]

Thanks for this very helpful video. In watching this, it seems that a lot of the need for cleaning or maintenance required (eg backflushing) is caused because of the shared pathway to exhaust pressure from the group and end up with a dry puck. Are there any designs on groups that address this issue?

[@Wholelattelovepage]

Hi PI, Thanks for the comment and question. No designs I'm aware of other than cheap entry-level espresso appliances which do not have a 3-way valve. With those you end up with a soupy mess in the filter basket and residual pressure after an extraction. Marc

[@brozbro]

Thanks for the good info. I have a Quick Mill HX, so I assume the internals are similar to your model. My manual states that the machine should "reach temperature in approximately 15 minutes, but to make delicious espresso with thick rich crema it is necessary to allow the machine to be heated for 30-45 minutes with the portafilter kept in the grouphead." What I don't see in your video is what the extra 30 minutes of heating time is actually doing, given that the boiler has reached its maximum after 15 minutes. Do you?

[@Wholelattelovepage]

Hi Rich, I sure do! That extra time allows the group head to reach full temperature. In E61 groups there's a thermo-siphon which through convection is constantly circulating water through the group to heat it up. In order to get stable brew temps the group must be fully warmed prior to use. In this type of machine full heating of all the metal in the group head does take about 30 minutes. Marc

[@brozbro]

@@Wholelattelovepage I thought releasing water thru the group head prior to pulling the shot was supposed to do that. In a world of espresso nits this is just one more to pick.

[@kekelapp0r]

@@brozbro In HX machines, releasing water before pulling the shot is actually known as a "cooling flush" that gets rid of the water that has heated up too much in the HX. Just letting water run through the group head will only contribute a little to heating it up faster, but it takes a lot of time (and water) to heat it up completely.

[@mileszhong9308]

I watched a lot of e61 videos and when I saw these replica structures I thought they were tampered with. I think the correct logic should be that the boiler should be linked to the pressure relief device below when the tie rod is closed, at which point the pressure generated when the boiler is heated can be released in time, and conversely when the tie rod is opened the pressure relief device is closed to ensure extraction pressure.

[@Wholelattelovepage]

Hi mz, Thanks for the comment. Not sure I follow what you mean.

[@aj4901300]

great job!

[@Wholelattelovepage]

Thanks and thanks for the comment!

[@nanocnc]

What am I missing? Can someone help me understand how water continuously circulates through the heat exchanger to heat the brass group (5:23)... I see the loop of pipes and I can follow the described flow path, but I dont see how this can happen without an exhaust. Surely this is just a dead-end for the water?

[@Wholelattelovepage]

Hi n, The thermosiphon loop flow is driven by convection. Hot water continuously circulates out to the group. It cools a bit there and moves back the brew water heat-exchange section of the boiler. Reheats then flows back to the group.

[@chaoswr]

So there are actually two reservoirs - 1. the boiler 2. heat exchanger and top chamber. The pressure gauge and the pump setting only relate to the boiler, but the brew pressure is needed at the top chamber. Can you explain this discrepancy?

[@Wholelattelovepage]

Hi c, Thanks for the question. A little unsure of what you are referring to. One gauge measures pressure in the section of the boiler producing steam. The brew pressure gauge measures pressure in the brewing circuit - water which comes from the heat exchange section of the boiler. That's only active when brewing.

[@corneligel1449]

Very informative! Could you please tell me if there is a heat exchange machine available that does not have a teflon tube inside the small section of the boiler, dedicated to brewing? Does the Rocket machines also have the teflon tube?

[@Wholelattelovepage]

Hi CG, I'm checking on Rocket but I know for certain Crem machines do not have a Teflon tube in the boilers. Check out current Crem machines here: www.wholelattelove.com/collections/semi-automatic-espresso-machines?_=pf&pf_v_brand=Crem

[@corneligel1449]

Thanks for the interim feedback!

[@nightcoder5k]

Do the lines have to coil like that? If so, what's the purpose?

[@Wholelattelovepage]

Hi Coder, Great question! I do not know the answer with 100% confidence but it's likely to keep excessive heat and/or water from getting to the gauge.

[@Eiji_Kisaragi]

3:30 a checked valve? is it the same as what people called it a non return valve? whereby water does not flow back?

[@Wholelattelovepage]

Hi a, yes. Check valve and non-return are used interchangeably.

[@Eiji_Kisaragi]

@@Wholelattelovepage duly noted. you guys are awesome in what you are doing.. 👍👍👍.

[@shihster88]

The water goes through the injection pipe during brewing and mixes with the hot water in the heat exchange pipe at 9 bar. There is still a little gap at the bottom of the connecting piece grouting pipe where the recirculated water comes through as shown in 6:01. How does the pressure of the water in the pipe during the brew process at 9 bar during brewing not push backwards out of the exchanger and backwards through the cold side of the thermosiphon?

[@emilycarpenter5965]

Late to the discussion, but I had the same thought as you did. I am assuming that once the pump pressurizes the heat exchanger, water will flow from high pressure to low pressure meaning that water will flow through both lines of the thermosiphon to the back of the E61 group. However, since the colder water comes into the middle of the Hx, water leaving the Hx through the hot water line and through the recirc line of the thermosiphon should both be close together in temperature. Even if they are off by a few degrees, they will mix in the first chamber of the E61 before moving through the mushroom. I hope that makes sense, I've only been studying these machines for a few months.

[@vlariz]

Thanks for this vid guys really informative. One question I have is that if you wanted to increase the steam pressure, is it only possible via the pressure stat? thanks in advance

[@vlariz]

+vlariz nevermind just found your video about adjusting the sirai pressurestat you guys are awesome

[@Wholelattelovepage]

+vlariz Thanks for your question and well answering it yourself! Well I guess we did but you found it on your own so you are awesome too! If you have more ?'s ask away. We're always happy to help.

[@DanielBegin1]

Gents, thanks for the video. On my machine, the brew lever is very stiff when closing at the end of the shot. Is there any maintenance required for this aside from regular back flushing? Or should I open the brew head where the cam is? Thanks

[@Wholelattelovepage]

Hi Daniel, You are welcome and thanks for the question. So the machine should be descaled on a regular basis depending on how hard you water is. As to the lever being stiff... There is a cam internally which actuates a valve. Could be some build up on that or some wear. Can't be certain that's the issue but maybe. Here a video showing how to clean an E61 mushroom, jet and top valve: kzbin.info/www/bejne/anmYaISJerJ3ntU

[@Giannixeneize]

it's very interesting i have a question i have a rocket similar to that and from the steam lance I get steam and plenty of water? I should just go out steam right? that water might come out

[@Wholelattelovepage]

Hi G, Thanks for the question. It's normal to have some water come out when steam is first turned on. Within a second or two it should go to steam only. The initial bit of water is from condensation. Marc

[@kuldilakh7557]

CooL Explanatory x

[@Wholelattelovepage]

Hi KL, Thanks for the comment! Marc

[@corneligel1449]

Is there any heat exchanger machine available, that does not have a teflon tube inside the small boiler section?

[@corneligel1449]

Thanks! The video is very informative.

[@Wholelattelovepage]

Hi CG, I'm checking on Rocket but I know for certain Crem machines do not have a Teflon tube in the boilers. Check out current Crem machines here: www.wholelattelove.com/collections/semi-automatic-espresso-machines?_=pf&pf_v_brand=Crem

[@harshdave8401]

What is the size of boiler and how much maximum pressure is being generated by the machine??

[@Wholelattelovepage]

Hi harsh, Thanks for the question. Full specs on the current ECM Technika vaialable here: www.wholelattelove.com/products/ecm-technika-v-profi-pid#product-specs Boiler is 68oz/2 liters. Max pressure is ~1.3 bar for steam. Brew pressure is set to produce 9 bar max at the group but is user adjustable via an OPV. Marc

[@harshdave8401]

@@Wholelattelovepage thanks for your support hope for the same in future

[@bernhardtabert5900]

Well made :-)

[@Wholelattelovepage]

It's a fine machine indeed!

[@zruban]

One quick question: In the video (time 14:43) you are explaining how the pressure of E61 is released. What could be wrong if my Bezzera stops doing this back pressure thing from the brew group? I stop the coffe extraxting when coffe is done but no pressure from the bototm of the Group is released aftewards ...no ideas anywehere. Any suggestions?

[@Wholelattelovepage]

Hi MZ, Thanks for the question. Wish I knew which model Bezzera machine you have. Does your machine use an E61 group with a lever to start and stop the extraction or the BZ group? if E61 it may need a cleaning. If BZ group it has an electrical solenoid valve which may need attention if not blowing off pressure at end of extraction. Here's a video showing how to clean E61 group which may help with your problem: kzbin.info/www/bejne/anmYaISJerJ3ntU Marc

[@zruban]

@@Wholelattelovepage Thank you Marc. It´s Bezzera Mitica TOP with E61 group (HX boiler and ROTARY pump). I´m your big fan so I have already checked all avaliable videos out there and E61 group has been cleaned on regular basis (every 3 months)...it´s true that for a short time it helps (and by short time I mean 5-6 espresso :) )