<p>Well according to the <a href="https://youtu.be/lSppIjPSxyc?t=54s" rel="nofollow">video</a> presented on the website you have to provide hot water. </p>

<p>To my understanding of the machine's principle as well as physics there is absolutely no way it could produce hot coffee from cold water. The confusing quote from the FAQ</p>

<blockquote>
  <p>Minipresso produces at ambient condition (75°F, 24°C), an espresso at perfect temperature (152°F, 67°C in cup) with a nice compact and persistent crema on top.</p>
</blockquote>

<p>actually is about <em>temperature loss</em> during the process.</p>

CC BY-SA 3.0
2015-04-28T20:41:03.357Z
Can you elaborate on what you mean by temperature loss?
Suspended User
CC BY-SA 3.0
2015-04-28T21:12:12.497Z
The water loses the temperature by heating its containers.
Lamorak
CC BY-SA 3.0
2015-04-28T21:50:50.687Z
That makes sense, although one would expect some offset of that with the increased pressure.
Suspended User
CC BY-SA 3.0
2015-04-28T21:55:01.157Z
We are talking about liquid, the pressure does not considerabely affect the temperature. Not as much as with gases.
Lamorak
CC BY-SA 3.0
2015-04-28T22:02:15.893Z
True.  However, there is some gas being compressed in there as well, and that gas' increased temperature should transfer to the fluid and container as well.  It's probably just less than the heat lost to the device acting as a sink.
Suspended User
CC BY-SA 3.0
2015-04-29T06:13:39.897Z
You are overthinking it :) the temperature change caused by pressuring the air does not really matter
Lamorak
CC BY-SA 3.0
2015-04-29T09:12:54.917Z
Fair enough -- I didn't notice the videos!
Ivan Kapitonov
CC BY-SA 3.0
2015-05-07T09:12:50.040Z
Completely correct.  Received mine in the mail today.  Using boiling water produces a shot of espresso at a hot but very drinkable temperature.  I'd call it perfect, actually, as my own opinion (on the temperature).
Suspended User
CC BY-SA 3.0
2015-04-28T17:01:17.010Z
2015-04-28T17:01:17.010Z
Lamorak
<p>Does anyone use <a href="http://www.wacaco.com/" rel="nofollow">this</a> amazing apparatus?</p>

<p>I'm wondering if you can pour cold water in it and get a hot espresso (which, well, should be hot by definition)? If so, how does the heat come about?</p>

<espresso><equipment>
Does Wacaco really produce hot espresso (and how)?
Ivan Kapitonov
# Does Wacaco really produce hot espresso (and how)?

(Asked by: username_0 on 2015-04-28)

Does anyone use [this](http://www.wacaco.com/) amazing apparatus?

I'm wondering if you can pour cold water in it and get a hot espresso (which, well, should be hot by definition)? If so, how does the heat come about?

**Tags:** espresso, equipment


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## 1 answers

### Answer by username_1 on 2015-04-28. Score: 2 | Accepted answer

Well according to the [video](https://youtu.be/lSppIjPSxyc?t=54s) presented on the website you have to provide hot water.

To my understanding of the machine's principle as well as physics there is absolutely no way it could produce hot coffee from cold water. The confusing quote from the FAQ

> Minipresso produces at ambient condition (75°F, 24°C), an espresso at perfect temperature (152°F, 67°C in cup) with a nice compact and persistent crema on top.

actually is about *temperature loss* during the process.

> **Comments:**
> **username_2**: Can you elaborate on what you mean by temperature loss?  
> **username_1**: The water loses the temperature by heating its containers.  
> **username_2**: That makes sense, although one would expect some offset of that with the increased pressure.  
> **username_1**: We are talking about liquid, the pressure does not considerabely affect the temperature. Not as much as with gases.  
> **username_2**: True.  However, there is some gas being compressed in there as well, and that gas' increased temperature should transfer to the fluid and container as well.  It's probably just less than the heat lost to the device acting as a sink.  
> **username_1**: You are overthinking it :) the temperature change caused by pressuring the air does not really matter  
> **username_0**: Fair enough -- I didn't notice the videos!  
> **username_2**: Completely correct.  Received mine in the mail today.  Using boiling water produces a shot of espresso at a hot but very drinkable temperature.  I'd call it perfect, actually, as my own opinion (on the temperature).  

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