Keurig K Slim Review: Our Expert Reviews of this K-Slim Model

Keurig K Slim Review

When you're living in a small space, it can be challenging to find room for an entire kitchen. When there's no place for coffee on the counter, what do you do? You could go through the hassle of brewing your coffee every morning and cleaning up afterward, or you could invest in a Keurig K-Slim.

Keurig has designed the K-Slim to brew one cup at a time to take up less space than other models. It also makes delicious cups of coffee with minimal effort. Read this Keurig K Slim review for more information about how you get back to enjoying your mornings.

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Keurig K Slim Review


The Keurig K-Slim coffee maker isn't the most expensive model. It isn't the fanciest. It won't win any designs for innovation. However, it does the job as a great entry-level single serve coffee machine. It brews quickly and has a modern look that will please most buyers, especially if you're looking for something that won't take up a lot of space in your home office or small apartment.

Because it takes up so little space, you could even pack it up and take it with you when traveling. You wouldn't need to worry about making a mess of the hotel room or using more coffee than necessary if you're staying somewhere that doesn't have brewing equipment on site.

The most important question to answer, though, is this: does the Keurig K-Slim single serve make great-tasting cups of coffee? Yes! The reviews are in -- this machine will give you delicious cups of brewed coffee every time without all the hassle.

But before we get into looking at the specifics of this coffee maker, here is a brief overview of what you can expect out of the Keurig K-Slim:

  • ✅ It is perfect for small countertops or when you don't want your coffee maker to take up a lot of space.
  • ✅ It brews coffee in minutes; no more waiting forever to get your cup of joe first thing in the morning.
  • ✅ You only need to use one K-Cup of your choice, which means you generate less waste when brewing a cup. It also means you can have a different flavor with each cup of coffee.
  • ✅ A drip tray provides an area where you can pour any overflow from overfilled cups.
  • ✅ It can accommodate three different sizes of cups: 8 oz., 10 oz., and 12 oz.
  • 🚫 It's a little heavier than other coffee makers, weighing in at around 9 pounds.

Design/Build Quality (3/5) ⭐

Let's start by looking at the design and build quality of the Keurig K-Slim.

With this generation of Keurig, space is no longer something that you'll have to worry about. Since the Keurig K-Slim is only 5 inches by 12 inches by 15 inches, it can go anywhere you need it to, such as your office, studio kitchen countertop, or dorm room pantry. The sleek appearance blends in with most spaces seamlessly.

There's a certain heft to the Keurig K-Slim, weighing in at around nine pounds. It has an ergonomic handle that makes it easy to carry from one place to another while also being durable enough for everyday use.

The plastic outer part of the coffee machine may feel a little weak and cheap when you first hold it in your hand. Still, it comes with a warranty which should give you peace of mind, knowing that if anything were to happen to the machine, you would be able to easily have it fixed or exchanged for a brand new one. Most customers won't experience any problems with their machine until years after its purchase date, so the build quality is still pretty good.

Speaking of quality, one of the best things about it is the water tank. The Keurig K-Slim has a pretty big reservoir for being so small and compact. It's got a total volume of 46 oz. of water, meaning you can easily get four 8 oz. cups of coffee from one tank of water. So, in contrast to the K-Mini or K-Mini Plus, you don't have to refill the water tank for every single use.

Plus, with this design feature, you get an easy view inside that tells when it's time for refills and cleaning. The detachable component allows for hassle-free maintenance and quick access to fill or clean up after your machine as needed without ever having to remove the entire unit from your kitchen countertop!

However, there is one problem related specifically to design: the cord length on this model seems too short for some customers. This is a problem because you might not be able to put the machine where you want it without getting an extension cord, which can sometimes seem unsightly depending on your kitchen configuration.

Performance (4/5) ⭐

When it comes to making the coffee you brew from your Keurig K-Slim taste great, you need to pay attention to three things:

  • Quality of water
  • Type or brand of pod you use
  • Frequency of cleaning your device

If you focus on these three things, you'll constantly enjoy better-tasting cups of coffee.

Water Quality

The best kind of water to use in your Keurig K-Slim is water filtered by reverse osmosis or distilled. Distilled water is the best because it doesn't have any minerals in it. Minerals can cause your coffee to taste bitter or "off."

In addition, distilled water or water purified through reverse osmosis does not contain any impurities, which means that cleaning will be even easier.

Coffee Pods

One of the great things about using the Keurig K-Slim is that you don't have to only use K-Cups. In fact, you can use cups from almost any of your favorite brands, like:

  • Green Mountain
  • Starbucks
  • Gloria Jeans

The ability to use cups from different brands means that you can easily change coffee flavors whenever you want—no more waiting around for someone to finish a pot of coffee before you start brewing another cup with a different flavor.


You can do some simple upkeep tasks every week to maintain your Keurig K-Slim in mint condition, such as wiping down removable parts or brewing distilled water into small cups. The most challenging part of maintenance is descaling which only needs to be done every 3-6 months, so don't worry if it's been a while since your last cleaning session -- get to it. Your coffee is bound to taste so much better!

The removable parts of the machine, such as the drip tray and water tank, are simple enough to wash in the sink.

For full coffee taste, you should also thoroughly clean the pin after you brew any strong drinks. If you don't drink very often and the water has stayed in the reservoir for a few days, it's a good idea to clean out the tank before you brew another round of coffee. If you do that, you won't have that "stale" taste you can sometimes get when the water sits for too long.

Ease of Use (4/5) ⭐

When you want a cup of coffee in the morning, you don't want to feel like you have to wait around for a machine that takes too long, especially if you need your coffee right away. The Keurig K Slim delivers coffee in under one minute, which is the perfect amount of time when you're rushing out the door or want a quick pick-me-up before going into work.

The Keurig K-Slim has a pared-down interface that makes it super easy to use. While you might think this would be a disadvantage compared to other fancier models, it isn't. The machine has a few buttons on top of it, which permit you to turn it on, adjust the size of your cup of coffee, and get that ball rolling. You won't have any extra confusing buttons to deal with.

Lift the handle, insert your favorite cup from your favorite brand (and don't forget about all those delicious coffee flavors), choose how much caffeine you want in that first drink, and hit start! In less than 60 seconds later, voila: fresh brewed Keurig coffee right at home!

Finally, the Keurig K-Slim turns off automatically and saves you in more ways than one. For a start, it reduces running costs by turning itself off when inactive for five minutes; this prevents your device from consuming electricity while no one is around to use it (and vice versa). It also protects against electric shocks or fires that can happen if you plug the machine into an active power source without using it.

Features (3/5) ⭐

The Keurig K-Slim is short on advanced features. There are plenty of other models with extras like a strong brew option, iced brew option, or temperature control.

That being said, while the Keurig K-Slim is missing some of these features, it makes up for it by adding two other excellent features.

Hot Water

With the Keurig K-Slim, you don't need a dedicated button to get hot water whenever you want it. If you pick a brewing size and then start the coffee maker without first putting in a K-Cup, it will produce hot water instead of coffee, which is perfect for tea or oatmeal in just minutes!

With its sleek design and ability to produce both brewed coffee AND hot drinks on demand - including tea & cocoa as well as quick breakfasts - the Keurig K-Slim is a perfect addition to any kitchen.

Flexible Cup Sizing

Not all coffee drinkers are the same. Some like to drink it throughout the day, while others like to have a small cup in the morning before heading to work. We think the best thing about this K-Slim is its variety of brew sizes. You can choose between a single 8 ounces, 10 ounces, or even 12 ounces over two hours if you're feeling particularly indulgent that day!

Some Keurig coffee makers come with other brew sizes, but this K-Slim gives you three of the most popular choices all in one machine.

Some people love to enjoy their coffee on the go rather than at home. If you're one of these active creatures, your brewer must be compatible with your travel mug, so there are no limits as to where you can take your beverage. Luckily, the K-Slim has a removable drip tray which allows for tall cups and up to 7 inches in height! Just pull out this tray when needed and brew away - all without any space limitations whatsoever!

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Is the Keurig K-Slim Worth It?

keurig slim

In short, yes.

The Keurig K-Slim is a high-quality coffee machine that is worth the investment. This K-cup coffee maker is very compact and takes up little space on the counter, especially if you have a small kitchen. When you're looking to make just one cup at a time, this model is better as it takes up less room than your traditional 12 or 18 cups per day brewer.

We love how it displays water levels so easily with a reservoir, making brewing easier for us! In addition, having a water reservoir that's easy to fill makes this machine very convenient because you can make several cups without having to refill on your own.

The temperature of the brewed coffee stays at just about ideal temperatures, too -- not scalding hot or lukewarm but stays nice all day long.

Finally, the three different brewing sizes that you can use to brew your perfect cup of joe -- from large cups to smaller ones -- make it ideal for every coffee occasion.

Frequently Asked Questions

keurig k slim reviews

Do you need to buy a filter for the Keurig K-Slim?

You don't have to have a filter with the Keurig K-Slim. However, if you're not using purified water, you should think about getting one.

While not using a filter won't damage your machine at all, the impurities and microparticles in impure water can drastically change the way your coffee tastes.

A filter can help remove those, especially when you don't have distilled water on hand.

What's the best way to clean your new Keurig Slim-K?

For best washing practices, keep the following points in mind:

  • Try and wash it at least once a week so that it stays in optimum condition. You can use a damp, soft cloth to clean off any spills and muck that's gotten anywhere. If you have tougher stains, try using mild dish soap in water and rinse well afterward.
  • To clean more thoroughly, use a few drops of dish soap in water, scrubbing with your hand, or an old toothbrush until you've been able to remove all the residue. Rinse thoroughly afterward (and make sure the parts are dry) before putting it back together again.
  • Finally, if you brew any sticky-like beverages like hot chocolate, follow that brew up with a cleansing brew. You can do this by adding a cup of water to the machine, then pushing any button that says "brew now." You just won't insert any cups into the machine.

Final Thoughts

All in all, the Keurig K-Slim is a great coffee pot. It runs quietly and produces good-tasting coffee with less waste than its larger counterparts. The water tank holds just enough water for a few cups of joe at a time, but it's much more economical than having to fill up an entire reservoir every day like you would with regular size models. If you're looking for something that doesn't take up as much counter space or make much noise while doing its job, this might be your best bet.

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Author Profile Picture

Parker Russell is a coffee professional and the founder of Black Ink Coffee. As an expert in the field of coffee roasting, cupping (professional Q-Grader) and brewing, Parker has established Black Ink as brand that fuels the grind of dreamers.