The Wacaco Nanopresso machine is a hand-operated espresso machine. It is filled with either ground coffee or Nespresso capsules and, together with hot water, delivers a cup of espresso through a hand pump that forces the hot water through the coffee. My wife has one for travel and loves it.

Would this be permitted to use on Shabbat? I don't drink coffee so never looked at this before but reviewing other MY questions (especially Starbucks VIA on Shabbat) might lead to think it might be possible with water from a kli shlishi.

Any relevant opinion before I ask a rav?

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I'm not familiar with the machine you are picturing but a filter is not a problem so long as it's not (step 1) creating a mixture and then (2) separating it. So the coffee filters that are placed on top of the cup and water is poured through them should be fine.

As Rabbi David Sperling writes here

This is based on the ruling of the Shulchan Aruch (Orach Haim, 319,9 and the Mishna Brurah 33 ibid) which allows pouring water into a sieve that has grape dregs in it, in order that the water flow though the dregs (absorbing their taste) and out through the sieve. The logic here is that the water is poured into the sieve was not mixed, and it comes out not mixed. Based on this it is permitted to pour water over tea leaves (making sure not to break the laws of cooking on Shabbat - aiyn bishul achar afiya and kil shlishi) that are in a strainer, as the tea just flows through the strainer, absorbing the tea taste, and out the other side (see Shmirat Shabbat 3, 64 [Hebrew, new edition], and the Chazon Ish, Orach Haim, 53).

This is exactly the use of the coffee filter that sits on the top of a cup. The filter cup has coffee in it, and a paper filter on its base. The water is poured into this filter cup and then drips through into the cup below after having absorbed the taste of the coffee beans.

  • After reading about the product, it seems like it's fine. The only difference between this and a pourover is that it's poured with pressure. The way to tease apart the halacha is to ask about using the machine with cold water (which it says works for cold brew). If that's ok, then you should be fine. – SAR622 Jan 28 '19 at 12:32
  • I checked with R Jessurun and R Tabady and showed them the machine. Both allowed it for the reasoning you describe. I would just add that one needs water from a kli shlishi to avoid any issue. Thanks ! – mbloch Feb 1 '19 at 11:27

Any method of making coffee that involves ground coffee and filters falls under the category of borer and is forbidden on Shabbat. Nespresso Capsules contain ground coffee and this device employs a filter, and thus is no exception.

Pro tip: I prepare quite a bit of espresso on Thursday evenings or Friday afternoons to ensure both oneg Shabbat and proper concentration for Davening and Torah study. It can be mixed with hot water from a Shabbat urn or drunk lukewarm.

  • 1
    Your sweeping assertion is incorrect. Others maintain that using a filter, specifically a coffee filter, is not a problem of borer (e.g. Rabbi SZ Auerbach, Shulchan Shlomo §319). (I’d strongly recommend rephrasing your answer and at least providing sources for the opinion(s) you do cite. As MY.SE always urges answers to be sourced, all the more so for halachic related answers, IMHO.) – Oliver Jan 28 '19 at 4:32
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    A pourover filter is not a problem so long as it's not (step 1) creating a mixture and then (2) separating it. – SAR622 Jan 28 '19 at 12:26
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    After further research and discussions with 2 rabbanim, I am afraid this is indeed incorrect. See this other answer which I believe correctly reflects the reality. The two rabbanim I asked had the benefit of seeing the machine in person. Thanks for trying to help though. – mbloch Feb 1 '19 at 11:28

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