*SOLD!* – SIDEWALK SALE – Ascaso Steel Uno Professional Boiler Espresso Machine (Returned and Refurbished)

4 out of 5 based on 1 customer rating
(1 customer review)


In-Store Purchase ONLY. NO Shipping. NO Payment by phone. First come first serve. For more info: SIDEWALK SALES


This machine was returned within our 30 day return policy. It has a white film that does come off. Please note, this model has been discontinued at 1st-line.

Warranty limited to manufacturer’s defect: 30 day parts and labor.

Please read our response to COVID-19 for complete details on in-store pickup.

SIDEWALK SALE – Ascaso Steel Uno Professional Tank / Reservoir Espresso Machine – boiler


The Ascaso Steel Uno Professional is an extraordinary home-model espresso machine. Ascaso has incorporated many improvements in Version 3 over the initial version:

  1. Increased cup height between portafilter and drip tray to 3.35 inches.
  2. Lateral removable (from right side) water reservoir allows easy access for refilling and cleaning without moving the machine away from overhead cabinets. The clear reservoir also allows you view the water level from the right side of the machine.
  3. The cool touch and multi-directional steam wand allows brief handling for moving the wand after steaming milk.
  4. The rubber protector over the wand allows holding the wand for longer periods of time.
  5. The steam wand is now made of stainless steel.
  6. The 325cL brass boiler with nickel plating incorporates a professional grade 3-way solenoid valve.
  7. The professional-grade 58mm portafilter handle designed with a 10 degree tilt for ergonomic handling.
  8. There is non-slip grip on portafilter handle.
  9. Ascaso includes a solid aluminum tamper.
  10. Highly polished filter baskets with microfine smooth holes provide superior extraction over the old baskets.

Ascaso has even stated the following advantages of the Steel Uno Professional over competing models in similar price ranges, and these include:

  1. Large size cup warmer (~14.5″ x 10.6″).
  2. Side rails (rear rail was removed from machines for the USA to provide greater area for cup warmer).
  3. Exterior body completely made of stainless.
  4. Boiler over grouphead design allows water to evenly heat grouphead whereas some other models have the boiler offset from the grouphead.
  5. Steam wand is multi-directional, professional 10mm grade, made in stainless, and includes internal hard plastic lining for cool touch capability and a 1 hole steam tip.
  6. Ergonomic, no-slip grip, professional grade portafilter assembly.

To enjoy the Ascaso Steel Uno Professional, it is important to run water through the steam wand after every steaming session, to descale the machine every 3-4 months, and to backflush once every 50 espresso extractions. In addition, if a timer is used to power up the machine, it is important to have the coffee, hot water and steam switches in the off position to avoid damage, and it important to place a surge suppressor rated 1080 joules or higher between the machine’s electrical plug and the timer as timers can cause surge damage. The water reservoir should be manually cleaned with non-abrasive dish detergent once every two weeks, and the drip tray should be emptied and cleaned every 3 days or less.

During normal operation, there is approximately a 30-45 second wait time to go from coffee mode to steam mode (after depressing the steam switch). One should always purge the steam wand before steaming/frothing milk. After steaming milk, the user can close the steam valve and depress the steam switch off. After placing a cup under the steam wand, the user can rotate the steam valve/knob to the open position, and the hot water switch must be depressed for the the pump to activate so that the ‘too hot steamed water’ exits through the wand and the temperature of the boiler can be brought down to make additional espresso.

Also, the three way solenoid valve operates to relieve the pressure on the filter basket immediately when you depress the coffee switch to off. This prevents the ‘explosion’ of coffee grounds that is normally found on home espresso machines without three way solenoid valves. The solenoid valve on this machine also assists in creating a dry puck after the extraction (please note there are certain coffees, grinds, and amounts of coffee that will make a wet extracted puck which no three way valve will compensate for). The relieved pressure exits to the drip tray and you will see.

Enjoy the Ascaso Steel Uno Professional preparing your favorite beverages! Espresso, cappuccino, latte, cafe americano, and hot chocolate to name a few!


  • Brushed stainless steel finished body over a black enamel painted steel frame.
  • Water reservoir removable from the right SIDE of the machine.
  • Nickel-plated brass boiler capacity: ~325cc.
  • Brass boiler is located directly over the brass grouphead for superior temperature stability compared to boilers that are offset from the grouphead.
  • Ergonomic-styled brass filter handle with plastic grip.
  • Slide out drip tray made of plastic for easy cleaning (please note drip tray cover is part of machine). Front portion of pull out drip tray is in brushed stainless steel.
  • Four selection switches: power on/off, espresso extracting, hot water, and coffee/steam mode.
  • Vent in top rear of machine allow heat near water reservoir to escape.
  • Blue lights (left to right) indicate power, heating (on when heating in coffee or steam mode), pump for hot water on, and steam mode (on when machine is in steam mode).
  • Three-way solenoid valve allows the immediate removal of the filter handle when the espresso extraction is completed. The three way valve also allows the user to backflush the grouphead.
  • Multi-directional steam wand allows the desired angle of the steam wand into the steaming pitcher (recommended size 20 oz or less) on counter or placement over drip tray.
  • Passive cup warmer on top with side guard rails (top back rail was removed for the US market).


Height (inches)

15, approximate

Width (inches)

11, approximate

Depth (inches)

11.5, approximate

Weight (pounds)


Wattage (watts)


Voltage (volts)


Boiler capacity (liters)


Portafilter size (mm)


Tank capacity (liters)


Country of manufacture

Barcelona, Spain

Espresso Machine Warning:

  • ELECTRICAL WARNING: To avoid electrical damage to this espresso machine which is not considered a manufacturer's defect, please acquire and install a single-outlet surge suppressor rated at 1080 joules or higher. the lack of the recommended surge suppressor, the espresso machine can be damaged at the power switch, the electronics, the heating element, the pressurstat or the wiring inside.
  • WATER WARNING: To increase the useful life of and not damage your espresso machine, please use softened water. Softened water is water without calcium and without magnesium, but still has other minerals for espresso extraction. Do not use distilled water, purified water, nor reverse osmosis water as these types of water create oxidation with the metals and cause the same damaging effects as limescale.
  • DESCALING WARNING: We do not recommend descaling unless there is an issue with the espresso machine. The reason is that too much descaling can eat away at the metals and gaskets inside an espresso machine.

  1. The instructional manuals for Ascaso are printed for worldwide distribution and covers almost every model produced worldwide. With this in mind, there may be features, accessories, or colors available in Ascaso equipment in other countries, but not available in our models produced for the United States.
  2. Ascaso provides a 57mm tamper so it can reach deeper into the basket and in case one chooses to utilize different baskets where a 58mm will not fit.
  3. This machine is designed primarily for ground coffee. The pod filter basket works ok with ESE pods on this machine, but not as good as pods would work on Ascaso's Versatile models.

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1 review for *SOLD!* – SIDEWALK SALE – Ascaso Steel Uno Professional Boiler Espresso Machine (Returned and Refurbished)

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    Please ask follow up questions as a new question. Submitted questions will be first reviewed, answered, and lastly publicized.

      I have an Ascaso Steel Duo Prof Tronic and was wondering what grouphead gaskets on your website are compatible with this machine. In particular which of the Cafelat silicon gaskets?
    1. 0 votes
      Q I have an Ascaso Steel Duo Prof Tronic and was wondering what grouphead gaskets on your website a...... Read more answer now
      Asked by Mario on November 25, 2019 6:41 pm
      Answered by the admin

      Sorry for the delay as there was a glitch on our web site. Please always use the diagrams on our web site, then search for the part number using the search box on our web site. The diagrams need to be referred as parts change over time.

    2. Hi, I'm having an issue with i believe pressure build up in the machine. When I use the blind filter to clean it, i'm unable to remove the portafilter without letting some water out of the wand. I'm also failing to get a good back flush sound when either cleaning or making espresso. Is this an issue with the 3 way solenoid getting clogged somehow? I've descaled twice.
    3. 0 votes
      Q Hi, I'm having an issue with i believe pressure build up in the machine. When I use the blind fil...... Read more answer now
      Asked by Andrew Shapiro on September 28, 2018 3:54 pm
      Answered by the admin

      Sorry to hear about this. It could be a bad solenoid valve or it is clogged. There is no test of the solenoid except to replace it.

    4. Hi, i'm having an issue i think is related to pressure build up in the machine and don't know what is wrong with it. When i use the blind filter to clean it, after turn on the pump it fails to release the pressure and i cannot remove the portafilter without releasing some water from the steam wand first. When i make espresso its not making that solid SSHHH release of pressure after pulling a shot, its very faint. I think something is wrong and not sure what would need to be fixed. Can you advise what might be the issue?
    5. 0 votes
      Q Hi, i'm having an issue i think is related to pressure build up in the machine and don't know wha...... Read more answer now
      Asked by Andrew Shapiro on September 26, 2018 4:52 pm
      Answered by the admin

      Sounds like a bad solenoid valve.

    6. I need two of each of the bicone and pipe reinforcement and nut for the Teflon pipe that connects the group boiler with the 3-way solenoid valve on a ASCASO Steel Duo Tronic espresso machine made in 2008. the model number is SDbfTbr. The expresso machine was purchased by my son David  in January of 2015 on invoice number 213660.
    7. 0 votes
      Q I need two of each of the bicone and pipe reinforcement and nut for the Teflon pipe that connects...... Read more answer now
      Asked by Jerry Edwards on September 25, 2018 1:55 am
      Answered by the admin

      Sorry, the 3 way solenoid is directly attached to the grouphead. Attached is the diagram for units older then September, 2012. Please double check AND ask as a  new question.



      A I downloaded the "ascaso steel uno professional (boiler version) parts diagram" from your website. The part numbers I.46, I.139 and I.138 on the 6th. page are the parts I need. My Teflon pipe I need the connection parts is 6mm outside dia x 4mm inside diameter. Can you help me? thanks, Jerry
      A I'm not certain what the component is that the Teflon pipe connects the group boiler to. However, the bicone on the boiler end of the pipe is damaged and leaking. I can measure the outside diameter, inside diameter and length of the bicone and send that info to you if it will help in finding the correct part. The pipe reinforcement and nut are usable.
      Answered by the admin

      Please search for all the part numbers on our web site without the periods in the part number. They will show up on our online store.

    8. Looking for a group head gasket / seal and shower curtain for my Ascaso Steel Uno V3 machine (manufactured October 2012). What are the part number, if you carry these items, and is there a maintenance kit that might includes these and other parts available?
    9. 0 votes
      Q Looking for a group head gasket / seal and shower curtain for my Ascaso Steel Uno V3 machine (man...... Read more answer now
      Asked by Oleg Kipnis on November 15, 2017 6:09 pm
      Answered by the admin

      Sorry, we currently do not offer a maintenance kit at the time of this writing. It is important to know the month/year of manufacture for Ascaso as they constantly make changes and improvements in their products.

      After unplugging the machine for the electrical outlet, please remove two screws in back top and then top cover in back is slightly lifted then slid off the back. Please review the diagram for the parts you need AFTER you confirm you have the same boiler size for the PRO. Part numbers can be searched on our web site. If no result, please remove the periods from the part number in the search.


      Ascaso Diagram Steel Uno Pro Group Boiler

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