The Main Differences Between Keurig K-Mini and K-Mini Plus & Older K15, K10, and B31 Models

By | October 2, 2019

There are a bunch of tiny k-cup coffee makers on the market, I know because I own seven of them that fit this description!

I actually reviewed many of the smallest k-cup coffee makers (regardless of their brand) here if you care to look.

Of all the current machines on the market Keurig makes two models the K-Mini and the K-Mini plus that are “premium” options in this market.

I have personally purchased both units and have used each of them quite regularly (just for the sake of this comparison). You see, I love coffee and I run a coffee blog, so this kind of experiment is right up my alley and is pretty fun for me.

Before I get into the meat of the comparison however I want to give you a summary.

Keurig K-Mini vs K-Mini Plus: The Differences

In almost every situation with every retailer out there you will pay more money for the K-Mini Plus.

I personally purchased the K-Mini Plus at a local retailer in my town that was having a sale. I picked mine up for a super low price of $59.99, much lower than most people will be able to match.

You can see current Amazon pricing for the K-Mini Plus here.

The K-Mini however I purchased on Amazon for a pinch more than that, although ordinarily the Mini Plus will be closer to the century mark and higher in price than the K-Mini basic model.

You can see Amazon pricing for the regular K-Mini here.

Features of the K-Mini include a big 1470 watt “motor” to run the water heater and pump. This is more wattage than all of the other small k-cup coffee makers on the market these days.

You also get a 6-12oz water reservoir where your brew cup consists of 100% of what is in the reservoir when you press the brew button. 6oz in you get a 6oz cup of coffee – 12oz in you get a 12 oz cup of coffee, and so forth in between.

Both the K-Mini and the Plus version use identical internal components and styling. They both give you cord storage, needle and funnel removal, drip tray removal but the Plus version gives youa couple extra features.

Most notably the Mini Plus will give you a removable water reservoir (of the same size). This gives you the ability to fill the water up at the sink rather than at the machine.

You also get a “strong brew” option that is not available on the basic K-Mini. The strong brew functions as a slow down option. When you press the strong button the brew flow is slower resulting in a longer brew cycle but a more complete extraction – dare I say strong or bold.

See this post for more on how the “strong” button works on a Keurig.

As many coffee snobs will attest a longer water to grind contact time will result in more of the desirable coffee flavors getting extracted but also more of the bitters that usually only extract with increased water exposure or finer particulate size.

The last main difference between the K-Mini and the K-Mini Plus is that the plus version comes with an extra storage container that can hold up to 9 k-cups. This container “plugs” right into the space where your coffee mug would normal sit during the brew cycle.

For me the storage compartment is annoying but I know full well a lot of people will like this added perk.

Other than these three points the two units are identical. Most importantly the inner workings of the two machines are 100% identical so they should have the same expected lifespan and should make the same exact tasting coffees.

How They Compare to the Older Keurig Mini Machines (K10, K15, & B31)
The modern day K-Mini machines stand 12.1″ high and 4.5″ wide. This is skinnier than the older Keurig mini design but also taller.

I suspect this design change is due to the fact that many people wanted a smaller lateral footprint of the Keurig on their counter but a taller unit to accommodate full size travel mugs that so many people use regularly with both k-cup coffee and standard drip coffee makers.

The old Keurig models B31 and K10 were replaced after a recall was announced in late 2014.

After that model K15 was released using the same style and components as the previous units. The only difference in these units was the “over-heat & spay” issue that spawned the recall had been fixed.

For a while the K15 was a very popular model with consumers but the mug height issue was a drag as was the ability to brew larger cup sizes.

Here are the specs of the K15 on Amazon from 3rd party sellers.

Personally I would never brew a 12oz cup of coffee from a k-cup because it would be seriously watered down but some people have no trouble doing just that so the new K-Minis solved this problem by implementing the water-in water-out function that is commonly found in non-keurig machines like Chulux, Chefman, and Hamilton Beach and uping the max water-out volume to 12oz.

None of the older model Keurig Mini machines offered brew strength selections, removable water reservoirs, or power cord retraction like the K-Mini Plus either so the new machine does offer more for your money…but, what I liked about the older models was that they were shorter.

The K15/K10 for instance only stood 11.1 inches high and 12.8 inches high when fully open. This made it easier to use when it was placed on a countertop under a cabinet than the current K-Mini models which stand a full 16.8 inches high when open.

Basically I have to pull the new models out from under the cabinet to put water in them whereas the older K15 model didn’t have to be moved for me to use it.

For years on this site I’ve had people asking me what size mug fits under a Keurig mini and I’ve always said normal coffee mugs work best but that really only pertains to the old K15/K10/B31 series machines. The new K-minis aren’t nearly as short and standard travel mugs fit under than just fine… at the expense of the machine actually being short of course. :/

Which is best?
I feel obligated to say the new K-Mini Plus is best. It’s new and widely available but personally I like the shorter style of the K15 over the skinnier/taller style of the modern K-Mini and K-mini Plus.

The new models do have nice cord management features and the design style does seem more durable and I LOVE the removable water reservoir on the new Mini Plus.

What really does it for me though is the brew strength selector – that’s what makes this machine better.

To really make a great cup of coffee you can’t rush the actual brew time. A pour-over cup of coffee can take a few minutes just to pour let alone heat up the water so a slower drip will always result in better tasting coffee.

Check out the K-Mini Plus on Amazon here.

Each of the older units and the basic K-Mini of today offer one-button brewing but the modern Mini Plus includes an extra “strong” button that slows the actual water flow down allowing for better extraction and better tasting coffee.

The K-Mini plus with strong button is still wildly simple to use so the convenience factor is not lost but the taste of each cup of coffee is improved and that’s why I think it’s best.

You can get a similar feature in the Hamilton Flexbrew 49979 for a lot less money but you do miss out on some usability features and the improved quality that comes with the Keurig manufacturing process – only you can decide if the lower price is worth it.

Check out pricing and specs on Amazon for the>Keurig K-Mini here, the K-Mini plus here, or the lower priced Flexbrew 49979 here.

Also, make sure to research the lower priced brands too. You can see my reviews of many of the smallest k-cup coffee makers here.