What’s the Difference between Keurig K45 and K55: Comparison Reviews

When comparing these two models, you will clearly see that there aren’t too many differences. However, with K55, you can get a bit more.

It comes with two water filters and performs better overall. While K45 is an older model, it has a few bugs and doesn’t always make a perfect cup of coffee. However, it is less noisy than the newer brewer.

In this review, you will learn more about the key differences between these beverage makers, so keep reading.

K45 vs K55 Side-by-Side Comparison Chart

Coffee Maker ModelKeurig K45Keurig K55
Weight0.96 lb10.6 lb
Dimensions14.93 x 12.25 x 14.15 inches13.3 x 10.1 x 13.2 inches
Water Reservoir48 oz48 oz
Cup Size6, 8, 10 oz6, 8, 10 oz
Auto offYesYes
K-Cup CompatibilityYesYes
Brew TimeUnder 1 minuteLess than 1 minute
Variety of ColorsBlackBlack and Rhubarb
Button ControlsOne-touch button controlsOne-touch button controls


Because K45 and K55 are made by the same brand and are sold at almost the same price, they also share a number of features.

First of all, each machine makes various beverages and supports a large number of K-cups of different brands. You can make coffee, tea, and even hot chocolate. This makes these coffee brewers a great solution for people who want an all-in-one machine for the best price.

There are three different cup sizes available: 6, 8, and 10 oz. If you like your beverages stronger, it is recommended to pick the smallest size.

You can brew the coffee straight into your favorite mug. Because the machine’s drip tray is removable, you can fit larger cups there or even your favorite travel mug (to enjoy your coffee on the go).

In both coffee brewers, the water reservoir can hold 48 oz of water. This is enough for 6+ cups of coffee, depending on what size you usually pick. Both machines feature a water filtration system. It allows users to get the best-tasting coffee. You see, using clean, filtered water improves the quality of your beverages.

Keep in mind that, in order to use the filtration system, you will need to get the proper water filters for your machine. The good news is that the K55 comes with 2 filters. This means you can start using the filtration system right away.

One of the main features of both coffee brewers is the auto-off function. It turns the machine off when it’s not being used (after two hours, to be exact). So, you can save a bit on energy. And that’s a very nice bonus.

Another helpful feature is the low-water warning. There is no sound indication, unfortunately. However, you will see the light indicator near the “Add water” sign and you will know that there isn’t enough water in the reservoir.

Even though there is no sound indication, you don’t have to worry. Both K45 and K55 do not brew coffee when low on water. This means your coffee (or tea) will not go to waste and you will not end up with a half a cup of your favorite beverage.

Finally, both machines require regular descaling. This feature might be annoying for some users, but it is a necessity. It serves to clean the brewer and remove the unwanted calcium (or scale) deposits from the inside of the machine.

The descaling process is rather simple and easy to follow. It is clearly described in the manual. You can also contact a customer service representative who will guide you through the process.

Descaling needs to be done every 3-6 months, depending on how often you use your brewer. And even though the process is fairly simple, it does take some time. So, make sure you are prepared to spend a portion of your day cleaning your coffee machine.


Performance-wise, K45 Elite vs K55 do not really have many differences. Each coffee maker works with various beverages and brews coffee in less than a minute. The low-water alert and the auto-off features seem to work smoothly too.

Both of the machines take a couple of minutes to boil the water. However, K45 tends to be slower here. The time difference isn’t that big but might be crucial for users who are in a hurry.

Another factor that needs to be mentioned here is the noise. All coffee makers make noise when operating, and these two models are not an exception. The noise levels are bearable. However, K55 is a bit louder than the older model.

Another difference in the performance of these two coffee makers lies in the improvements the newer model features. K45 can malfunction occasionally, making the coffee taste a bit like plastic or messing up the cup size and the amount of water.

It seems like the manufacturer managed to fix all those bugs. The newer model (K55) performs noticeably better thanks to that.

Coffee Taste

This aspect is probably the most important. We buy coffee brewers because we want that nice, rich flavor and delicious coffee and tea without the need to go to the coffee shop.

Of course, the coffee taste will not depend solely on the beverage maker that you use. The flavor will also depend on the pod you are choosing. Some cheaper options don’t always have the high-quality ingredients, so make sure you get only the good, trusted coffee grade if you really want that more-than-just-decent flavor.

What you should know is that both K45 and K55 make good beverages. The flavor is rich and pure in the majority of cases, no matter what you make: coffee, tea, or even cocoa.

However, some users note that the K45 model does not perform flawlessly every time. There are cases when the coffee it makes might taste a bit like plastic. This does not happen often, but the point stands.

Perhaps this happens occasionally because K45, being one of the company’s discontinued models, uses older tubes, which might be of a lesser quality when compared with the newer, 2.0 coffee maker version (K45).


The installation process of Keurig K45 Elite and Keurig K55 coffee makers is actually the same. The manufacturer tried to make each brewing system user-friendly and intuitive in operation, which means both models are pretty easy to install and use. If for any reason, you are experiencing any difficulties, it is better to read the manual carefully. It is very nicely written, with clear and simple instructions.

When looking at the Keurig K45 vs K55 coffee makers and all the comparisons between them, the difference in the usage process also is non-existent. The manufacturer implements the same simplistic and user-friendly brewing system in each model.


When looking at the difference between K45 Elite vs K55 by Keurig, you can clearly see that it’s not in the design. These two coffee making machines look identically.

The only difference is probably the color options. While K45 comes only in black, K55 offers black and rhubarb (dark red) exteriors.

Advantages & Disadvantages

No matter what you are shopping for, you need to know both the strong sides of a product and its flaws, small and big. When looking at K45 vs K55, you will see that none of these two brewers is perfect. However, their good qualities might really make you forget about some of the drawbacks.

Keurig K45 Elite Review

Keurig K45 Elite Brewing System

  • Super easy to use.
  • Brews delicious coffee, tea, and other beverages without any unwanted burnt taste or unpleasant scents (in the majority of cases).
  • Features an incorporated water filtration system. It contributes to the coffee taste greatly. However, keep in mind that you will have to buy suitable filters regularly.
  • Supports countless different coffee, tea, and cocoa pods. It works with more than 500 from 75 different brands, even the off-brand and non-licensed ones. This gives you the freedom to drink literally whatever you want.
  • Features the energy saving function.
  • The drip tray is removable, so you can use larger cups and even travel mugs.
  • The clear water reservoir, so you can monitor how much you have left.
  • Brews beverages in the amount of three different cup sizes.
  • Doesn’t brew when low on water. This means you will not waste your coffee or tea and get, let’s say, only half a cup.
  • Sleek design.
  • Comes without the water filters. You will need to invest more if you want to use the filtration system.
  • Might mess up the cup size occasionally, pour too much or not enough water.
  • The water takes a few minutes to heat up, which might annoy some users.
  • Some customer reviews note that this coffee maker is not extremely durable. It might start malfunctioning within a few months.
  • Some review comments state that this model might make your coffee have a plastic taste in separate cases.

Keurig K55 Brewer Review

Keurig K55-K-Classic Coffee Maker K-Cup Pod Single Serve Programmable

  • Great quality of beverages, pure and rich taste without any unwanted flavors.
  • Super easy to use.
  • Brews coffee fast.
  • You can use various coffee flavors, tea, hot chocolate pods, etc.
  • Looks sleek and does not take too much space.
  • Beverages are available in three cup sizes.
  • Can accommodate larger mugs thanks to the removable drip tray.
  • Energy saving feature.
  • Comes with two water filters.
  • More durable than the older model.
  • Noisier than the previous model.
  • Occasional customer reviews report issues with the water pump (might stop working or start pumping water more slowly than it used to).
  • Doesn’t always make a full cup of coffee (might pour less water than needed).

K45 versus K55 – We Recommend…

Both these brewers offer a great value for money. They are functional and come with a nice set of features. Moreover, they sure can make a great cup of coffee!

However, when it comes to picking the best one, we would like to recommend the K55. Because this is the improved version of the K45 and it shows a better performance. It is also more durable. This means you will get to enjoy your favorite beverages longer.

It’s a great, functional machine, which doesn’t cost too much but can offer you delicious coffee every day.