<p><a href="https://youtu.be/yqgKlqAUM9g" rel="nofollow noreferrer">Turns out</a>, it's not heat which is the enemy of good coffee, but <em>too much</em> heat.</p>
<p>The best coffee warmer is one that keeps your coffee at a controlled drinking temperature. The problem with a thermos is that it will keep the coffee too hot for comfortable drinking initially. Reheating will burn the coffee.</p>
<p>So anything which keeps the coffee at around 50°C will be good. Product recommendations are off-topic here, but James Hoffmann recommends a specific mug in above linked video, although that seems a bit pricey to me (I actually only found it for about 200€).</p>

CC BY-SA 4.0
2020-12-15T06:31:44.907Z
I thought so because my Moccamaster also keeps my coffee warm and it doesn’t seem to affect the taste.  Thanks for recommending.
user32613
CC BY-SA 4.0
2020-12-16T01:25:28.080Z
Heating liquids is a tricky science because the amount of heat you need depends on the volume of liquid and the thermal qualities of the vessel. A heated mug will overcome this by eliminating the vessel variable and controlling for liquid volume. A USB warmer, on the other hand, will work with two fundamental problems: first, it can't know how much heat it needs to provide, and second, it has access to only five volts with which to provide it. The result is typically underwhelming unless you're keeping warm 4 ounces of coffee in a single wall steel cup.
R Mac
CC BY-SA 4.0
2020-12-18T15:05:52.673Z
USB warmer worked a treat!
user32613
CC BY-SA 4.0
2020-12-15T01:13:50.990Z
2021-01-08T22:13:13.567Z
2021-01-08T22:13:13.567Z
ths
<p>Heat is the enemy of coffee.</p>
<p>I brew my coffee in a French press and then transfer it into a <a href="https://rads.stackoverflow.com/amzn/click/com/B01LY5C1QB" rel="nofollow noreferrer" rel="nofollow noreferrer">carafe</a>, the carafe keeps it from cooling down.</p>
<p>I only pour out 1/3 to 1/2 of a cup at a time.</p>
<p>No unnecessary use of electricity.</p>

CC BY-SA 4.0
2020-12-13T20:57:18.123Z
I suspected this would be the answer. I totally need to do this but the physical experience isn’t as satisfying
user32613
CC BY-SA 4.0
2020-12-13T20:59:43.103Z
As satisfying as plugging something into a usb port? :)  What part of the experience do you think you will miss?
Alaska Man
CC BY-SA 4.0
2020-12-13T21:00:39.843Z
The part of not moving for 2 hours while reading my book and drinking coffee as part of my early bird routine ☺️
user32613
CC BY-SA 4.0
2020-12-13T21:06:10.713Z
You do not have a servant to keep your cup filled. I am available for hire, i am not cheap, easy but not cheep.
Alaska Man
CC BY-SA 4.0
2020-12-13T21:06:55.087Z
Thanks, but you’re not my type.
user32613
CC BY-SA 4.0
2020-12-13T21:07:23.677Z
I get that a lot.
Alaska Man
CC BY-SA 4.0
2020-12-13T22:12:25.343Z
For a cup (vs a full French press), a travel mug should also work?
Stephie
CC BY-SA 4.0
2020-12-16T00:29:06.700Z
Yes, any double walled stainless steel (or other very well insulated) container with a lid will work fine.
R Mac
CC BY-SA 4.0
2020-12-13T20:56:30.607Z
2021-01-16T10:28:11.327Z
2021-01-16T10:28:11.327Z
Alaska Man
<p>What is the best USB coffee warmer?</p>
<p>I find that I take way too long to drink my coffee and it gets cold. I usually take more than an hour per cup.</p>
<p>What do you recommend for best usb coffee warmer.</p>

CC BY-SA 4.0
2020-12-13T22:13:58.113Z
I struggle with a blank “the best”. Without details, this is about as opinion-based as it gets. (And that’s not even considering the problem of coffee that’s been too warm for too long - *shudders*)
Stephie
<coffee-culture><cup>
What is the best USB coffee warmer
user32613
# What is the best USB coffee warmer

(Asked by: username_0 on 2020-12-13)

What is the best USB coffee warmer?

I find that I take way too long to drink my coffee and it gets cold. I usually take more than an hour per cup.

What do you recommend for best usb coffee warmer.

**Tags:** coffee-culture, cup

> **Comments:**
> **username_1**: I struggle with a blank “the best”. Without details, this is about as opinion-based as it gets. (And that’s not even considering the problem of coffee that’s been too warm for too long - *shudders*)  

---

## 2 answers

### Answer by username_2 on 2020-12-15. Score: 1 | Accepted answer

[Turns out](https://youtu.be/yqgKlqAUM9g), it's not heat which is the enemy of good coffee, but *too much* heat.

The best coffee warmer is one that keeps your coffee at a controlled drinking temperature. The problem with a thermos is that it will keep the coffee too hot for comfortable drinking initially. Reheating will burn the coffee.

So anything which keeps the coffee at around 50°C will be good. Product recommendations are off-topic here, but James Hoffmann recommends a specific mug in above linked video, although that seems a bit pricey to me (I actually only found it for about 200€).

> **Comments:**
> **username_0**: I thought so because my Moccamaster also keeps my coffee warm and it doesn’t seem to affect the taste.  Thanks for recommending.  
> **username_3**: Heating liquids is a tricky science because the amount of heat you need depends on the volume of liquid and the thermal qualities of the vessel. A heated mug will overcome this by eliminating the vessel variable and controlling for liquid volume. A USB warmer, on the other hand, will work with two fundamental problems: first, it can't know how much heat it needs to provide, and second, it has access to only five volts with which to provide it. The result is typically underwhelming unless you're keeping warm 4 ounces of coffee in a single wall steel cup.  
> **username_0**: USB warmer worked a treat!  

---

### Answer by username_4 on 2020-12-13. Score: 1

Heat is the enemy of coffee.

I brew my coffee in a French press and then transfer it into a [carafe](https://rads.stackoverflow.com/amzn/click/com/B01LY5C1QB), the carafe keeps it from cooling down.

I only pour out 1/3 to 1/2 of a cup at a time.

No unnecessary use of electricity.

> **Comments:**
> **username_0**: I suspected this would be the answer. I totally need to do this but the physical experience isn’t as satisfying  
> **username_4**: As satisfying as plugging something into a usb port? :)  What part of the experience do you think you will miss?  
> **username_0**: The part of not moving for 2 hours while reading my book and drinking coffee as part of my early bird routine ☺️  
> **username_4**: You do not have a servant to keep your cup filled. I am available for hire, i am not cheap, easy but not cheep.  
> **username_0**: Thanks, but you’re not my type.  
> **username_4**: I get that a lot.  
> **username_1**: For a cup (vs a full French press), a travel mug should also work?  
> **username_3**: Yes, any double walled stainless steel (or other very well insulated) container with a lid will work fine.  

---

