Keurig B31 Review

Keurig B31
Overall Rating
Coffee Quality (40%)
Design & Features (20%)
Durability (20%)
Ease of Use (10%)
Brand Reputation (10%)
The Bottom Line
Keurig's original "Mini" K-Cup model, the B31 has a max 10 oz brew size with its "fill before each use" reservoir. Now discontinued, it's been replaced by the identical-looking K15 and upgraded K-Mini.
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Key Features of the Keurig B31

Key Features of Keurig B31

  • Product Line/System: Keurig 1.0 Classic
  • K-Cup Compatibility: Unlicensed K-Cups, Keurig 2.0 licensed K-Cups, and ground coffee with the My K-Cup
  • Brew Sizes: Up to 10 oz
  • Water Reservoir: 10 oz
  • Water Filter: None
  • Display: Buttons for Brew and Power; LED indicator for Add Water and Lift Handle
  • Temp Control: No
  • Strength Control: No
  • Dimensions: 6.9"W x 10.7"D x 10.8"H
  • Weight: 1.0 lb
  • Other Features: Removable drip tray, comes with K-Cup variety pack

Keurig B31 Overview

Want to know one of the most common Keurig-related questions we're asked?

What's the difference between Keurig's B series and K series brewers?

Answer: Nothing. The switch from B to K was solely a marketing decision as the company realized branding their brewers with a K made more sense. (They're called Keurig, after all.)

Discontinued and replaced by the K15, the B31 truly is mini. Its water reservoir needs to be filled before each use up to its 10 oz max brew size.

The B31 measures less than 11" in every direction with a somewhat narrow 6.9" width that was great when it was first released but seems bulky with the release of Keurig's new 4.5" K-Mini.

Keurig has released over 70 different coffee makers over the years, and only about a dozen of them are still in production and supported by Keurig. Those in-production models include both the K15 and K-Mini, making both preferable to the discontinued B31.

  • Compact and foolproof to use
  • Handy water measuring tool inside the reservoir to effectively measure out 6, 8, or 10 oz
  • Great for your desk at work, dorm room or bedroom, or anywhere else you want a cup of coffee quickly
  • No pod-scanning technology so brews both licensed and unlicensed K-Cup pods
  • Discontinued model
  • Not compatible with a water filter
  • Max 10 oz reservoir needs to be refilled before each use

Is the Keurig B31 for you?

Are Keurig B31 for you?

The Keurig B31 is a small, simple coffee maker with no extra features. It's best for occasional coffee drinkers who don't mind measuring out their water and refilling the reservoir before each use. But even then, go with the nearly identical (and still in-production) K15.

If you're looking for Keurig's newest mini coffee maker, check out the K-Mini. It has the same "fill before each use" brew method but includes Keurig's updated brewing system and a larger 12 oz max brew size in a smaller 4.5" package.

If the K10's 6.9" width is fine, you may like the K-Compact. It's a touch larger at 8.2" wide but has a 36 oz removable water reservoir. That's definitely handy if you're a daily coffee drinker.

Keurig B31 Review: An In-Depth Look

Check out the Keurig B31!

Check out Keurig B31!

Keurig B31
Keurig's original "Mini" K-Cup model, the B31 has a max 10 oz brew size with its "fill before each use" reservoir. Now discontinued, it's been replaced by the identical-looking K15 and upgraded K-Mini.

More Keurig Reviews From The Coffee Maven

Keurig K-Duo Essentials

Keurig K-Duo Essentials
Overall Rating: 87
A replacement for the discontinued K200-K575, the K-Duo brews both single K-Cups and full 60 oz carafes with the reusable Gold Tone filter. The Essentials builds on the K-Duo with a 6 oz brew size and Strength Control.

Keurig K-Supreme

Keurig K-Supreme
Overall Rating: 90
The K-Supreme is Keurig's top-of-the-line brewer with 3 versions: this base model, the Plus, and the Plus SMART. With a 66 oz dual-position water tank (back/side) and an Over Ice setting, the K-Supreme lives up to its name.

Keurig K15

Keurig K15
Overall Rating: 80
One of Keurig's original "Mini" K-Cup models, the K15 has a max 10 oz brew size with its "fill before each use" reservoir. Now discontinued, the K15 has been replaced by the slimmer K-Mini, which brews up to 12 oz K-Cups.
About The Coffee Maven
bryan de luca
Bryan De Luca

I'm Bryan but most people know me as The Coffee Maven. I grew up outside Boston, Massachusetts and received my Bachelor's degree in Biochemistry from Providence College. My first introduction to coffee was during my college days, when I used it as a source of caffeine to fuel late-night study sessions, but soon I became obsessed with the chemistry of coffee. How did changes to water temperature or contact time affect its taste? Why do beans from Africa taste fruity while beans from Indonesia taste spicy? I launched The Coffee Maven in February 2017 to explore these questions and help others brew their perfect cup. Welcome to my site, and thanks for reading!