Ratio Six Coffee Maker Review 2023: More Than Eye Candy!

After working as a professional barista for many years, Arne Preuss founded Coffeeness.

If you've checked out my coffee maker guide, you'll know I've tested a lot of machines. Furthermore, some are really pushing the boundaries when it comes to producing excellent drip coffee. That said, every so often, a coffee maker comes along that gets me really excited.

If you’ve checked out my coffee maker guide, you’ll know I’ve tested a lot of machines. Furthermore, some are really pushing the boundaries when it comes to producing excellent drip coffee. That said, every so often, a coffee maker comes along that gets me really excited.

The seems to be everywhere I look recently. I must admit to having paused my Instagram scrolling to gaze in wonder at it on more than one occasion. That’s why I just had to order a Ratio Six coffee maker to play with. From everything I’d seen and heard, I was in for a real treat.

Now that I’ve spent time testing the Ratio Six, do I feel like this intriguing coffee maker lives up to the hype? Well, you’ll need to keep reading my Ratio Six review to find out!

Ratio 6

The best stainless steel coffee maker by far!

Borosilicate glass supply lines

Stainless steel body

Well thought out design

BPA free

Expensive

You'll be torn between Ratio and Moccamaster

Ratio Six Coffee Maker Overview

Ratio is a Portland, Oregon-based company that’s been specializing in coffee makers since 2012. The manufacturer initially produced the Ratio Eight, a high end beauty with a hand blown borosilicate glass carafe.

Best Stainless Steel Coffee Maker

The Ratio Six coffee maker launched in 2020 as a more down-to-earth and affordable option and has been garnering rave reviews ever since. It’s little wonder I named the Ratio Six “best stainless steel coffee maker” in my coffee maker guide. The specs on this thing are incredible!

Although the Ratio Six is a little less flashy than its older sibling, there’s no denying that this coffee maker is a beautifully designed machine. With its sleek, minimalist aesthetic, clean lines and boutique vibe, the Ratio Six is going to be the star of your kitchen.

It’s a fairly compact machine, too, so finding a spot for it shouldn’t be an issue. The only problem I foresee is that everything else in your kitchen might look a little tired and ugly in comparison!

Price

Costing $295.00 on Amazon, the Ratio Six coffee maker is far from cheap. A price like that certainly doesn’t justify a machine that just looks good; it needs to be super functional too!

Attention to Detail

The Ratio Six Coffee Maker from above.

Fortunately, there’s a lot more to this coffee maker than eye candy. The attention to detail that’s gone into the design of the Ratio Six is impressive, to say the least. From the stainless steel shower head meant to simulate manual pour over to the filter basket heat shield, the manufacturer has covered every angle.

Golden Cup Certification

Unsurprisingly, the Ratio Six is one of a select number of machines that have been Golden Cup certified for home brewing by the Specialty Coffee Association (SCA). This is a pretty big deal, and means the Ratio Six had to go through rigorous testing. This was to ensure it maintains the correct brewing temperature and performs consistently. Style over substance? I think not!

Ratio Six Coffee Maker Features

If you need a coffee maker with a clock, numerous brew styles and programmable features, you’d be better off checking out some of the other machines in my guide to the best coffee makers 2023

However, if you’re a pour over fanatic who demands the highest standards in taste and preparation, the Ratio Six coffee maker might be just what you’re looking for.

Let’s take a look at some of the features that make this beautiful coffee maker so special.

Colors

Ratio 6 Coffee Maker Colors.

The Ratio Six coffee maker is available in three colors, each of which highlights the machine’s elegant form in a unique way. You can go with matte black, white with black accents or matte stainless steel with black accents. 

Personally, I prefer the stainless steel Ratio Six. However, I was only able to get my mitts on the white version. Let me tell ya, those pesky supply chain issues are still a thing! With that said, whichever color you end up with, you’ll get a coffee maker that’s made from sturdy precision formed stainless steel.

Control Panel

Closeup of the Ratio 6 Coffee Maker control panel.

When it comes to operating the Ratio Six, this coffee maker is a one-trick pony in the very best sense. Conveniently located on the front of the machine, right below the carafe, the control panel comprises just one simple button and three lights to indicate bloom, brewing and ready

That’s it. That’s all you get. I just love that the manufacturer is so confident in the capabilities of this product that it doesn’t feel the need to complicate things further with unnecessary fluff. 

Water Reservoir

Flying the Ratio 6 Coffee Maker water tank.

Sitting to the rear of the machine, the Ratio Six coffee maker’s water reservoir is made from BPA free copolymer. Let’s face it: that’s just a fancy way of saying plastic.

Still, I won’t hold it against the manufacturer. It’s hard to get away from plastic these days, and most of the machine is made from precision stamped stainless steel. 

The water tank has clear water markings from two to eight cups, and is accurate to within one ounce.

The reservoir holds 44 ounces (1.3 liters) of water to compensate for the fact that around 10 percent is absorbed into the coffee grounds during brewing. As it turns out, Ratio has thought of absolutely everything!

Supply Lines

I had to mention the supply lines in the Ratio Six coffee maker because they’re made from laboratory grade hand blown borosilicate glass. It’s not every day I encounter a drip coffee maker with such high quality and thoughtfully designed components.

Add in the fact that the Ratio Six employs a 1,400 watt die-cast aluminum heating element and you know you’re dealing with something special.

Shower Head

Closeup of the Ratio 6 Coffee Maker shower head in action.

It isn’t unusual to see a coffee maker with a shower head these days. After all, manufacturers are trying to win over the pour over loving coffee nerds with features that take the blooming process into account and allow for even saturation of coffee grounds. 

That said, Ratio has really gone to town on its shower head. It’s made from stainless steel and has many small holes so that water flows evenly. This, of course, ensures a perfect extraction. During my testing I was really impressed by how the Ratio shower head performs. I’ll go into more detail a little later.

Filter Basket

The Ratio 6 Coffee Maker filter basket and heat shield.

The Ratio Six’s stainless steel filter basket sits atop the thermal carafe and accepts Melitta 8-12 cup flat bottom paper filters. What’s really cool is the unique heat shield – a rubber “collar” that surrounds the shower head during brewing.

Not only does this enhance flavor, but it also helps maintain the ideal extraction temperature of 200 degrees Fahrenheit (93.3 degrees Celsius). For more open brewing, the heat shield can easily be removed.

Carafe

The Ratio Six coffee maker comes with a double wall stainless steel thermal carafe that’ll keep your coffee nice and hot for around an hour. I would have been happy with that, but Ratio likes to give you options.

If you like the idea of flexible brewing, Ratio has you covered. You can use the Ratio Six with the Ratio Eight thermal carafe, which features a porcelain dripper for a conical filter. You can even splash out on Ratio’s hand blown glass carafe, which uses Chemex coffee filters.

Anyway, the included carafe has to be one of the most impressive I’ve ever held. Seriously, this thing oozes quality. However, I will say that I didn’t like the way the carafe lid pours. Unfortunately, it’s quite difficult to get the coffee flowing, and I felt like I was in constant danger of spilling. Still, that could just be due to the fact that my hands were shaky from too much coffee!

Warranty

Closeup of the Ratio Six Coffee Maker's warranty.

As I already mentioned, the folks at Ratio are pretty darn confident in what they produce. The Ratio Six coffee maker comes with a five year warranty, which is almost unheard of in the coffee maker world.

Not only that, the manufacturer will do its best to fix your Ratio Six even when a problem arises that isn’t covered by the warranty.

What’s in the Ratio Six Coffee Maker Box?

The Ratio Six Coffee Maker with all its accessories.

I’m a sucker for beautiful packaging, which is why you’ll find Chemex boxes decorating my kitchen shelves. Ratio certainly doesn’t disappoint in this regard; featuring elegant line drawings of what’s inside, the box is a wonder to behold. Let’s just say I can’t bring myself to recycle it just yet!

Here’s what’s included with the Ratio Six coffee maker:

  • Machine base
  • Stainless steel thermal carafe and filter basket
  • Lid for filter basket with heat shield
  • Catcher for filter basket
  • Ratio microfiber towel
  • Four paper filters 
  • Operation guide
  • Removable power cord

Even the manufacturer’s unboxing video for the Ratio Six is cool and understated! Check it out:

How to Use the Ratio Six Coffee Maker

You didn’t come here for a lecture, so I won’t get too carried away. Still, may I gently remind you that using high quality, freshly roasted and freshly ground coffee beans is the key to getting great results from the Ratio Six coffee maker. After all, you deserve the best! 

If you don’t already own a decent coffee grinder, check out some of the options in my coffee grinder guide. If you’re truly serious about achieving great tasting coffee, you might also want to consider buying a coffee scale.

Using the Ratio Six coffee maker is actually very easy. Elegance and simplicity are everything here, and the Ratio Six offers you a way to prepare excellent pour over style coffee with one button convenience.

Start by adding cold, filtered water to the water tank, then replace the stainless steel lid. Place a paper filter in the filter basket, then add your (carefully measured) ground coffee to the filter. The filter basket fits snugly on top of the thermal carafe, and both components are placed under the showerhead as one unit. 

Now you’re ready to start brewing. Attach the power cord and plug it in. Then, simply press the power button and that’s it – the Ratio Six’s bloom light will come on, indicating the machine is evenly saturating the ground coffee with water to allow carbon dioxide to escape. Next, the brew light tells you the Ratio Six is performing the main brewing cycle.

Depending on how much coffee you’re making, just a few minutes later the ready light will alert you to the fact that delicious hot coffee awaits you! Once you’re ready to enjoy your coffee, remove the filter basket and carafe, place the filter basket on its drip catcher and attach the carafe lid.

Ratio Six Coffee Maker Observations

The Ratio Six Coffee Maker preparing coffee.

As is always the case during my coffee maker testing, I started out by following the manufacturer’s recommendations to the letter. I mean, this is how most consumers are going to do it, so it only seems fair. As you might expect, Ratio has included a fairly comprehensive brew guide in its user manual.

In the interests of not wasting a bunch of coffee, I decided to brew up a 2-cup carafe. I dutifully added 17 ounces (500 milliliters) of water to the reservoir and 35 grams of medium-ground coffee to the filter basket. I got a real kick out of watching the water bubbling up through the supply lines as the machine chugged away. Plus, the cool-blue indicator lights pulsate gently, which is a nice touch.

For my first brew I used a really special SL34 varietal from El Salvador with notes of lemon zest and raspberry. I’m happy to report that the Ratio Six knocked it out of the park. The machine perfectly represented this delicate coffee’s soft mouthfeel and light body. Seriously, I’ve never experienced such a clean, transparent cup from a drip machine.

Next up I brewed up a batch of Orange Bourbon from Guatemala. This time I did without the heat shield and increased the dose by a couple of grams.

Again, the results were nothing short of spectacular. The fully washed Guatemala is bright, juicy and sweet when I prepare it with a pour over dripper. However, the Ratio Six managed to tease out notes of citrus and chocolate that I’d never managed to get with my Hario V60. Let’s just say my mind was blown!

One thing I noticed is that when I used the heat collar the coffee was noticeably hotter. So, it works as advertised. However, removing the carafe and heat collar after brewing was a little tricky. Plus, the collar’s rubber seal consistently sprayed water droplets in my face when it came away from the shower head. Not a dealbreaker by any means, but something to be aware of!

Ratio Six Coffee Maker Cleaning and Descaling

How to clean the Ratio 6 Coffee Maker.

I’m pretty obsessive about keeping my coffee equipment clean. Limescale, mold and bacteria are all enemies of great tasting coffee and they aren’t doing your insides any favors, either. The Ratio Six coffee maker is actually very easy to keep clean.

The machine’s body and the stainless steel shower head can be wiped down with a damp cloth, and you’ll get a Ratio microfiber cloth in the box. That means those Instagram closeups will be free of lint and coffee dust!

During my testing I was consistently impressed by the Ratio Six’s efficient use of water. Unlike most other coffee makers, there was very little dripping or condensation after the brewing process was complete. Come to think of it, even the brew basket was fairly dry once I’d discarded the used filter.

As always, I strongly recommend ignoring the dishwasher when it comes to things like the carafe lid and other removable parts. The thermal carafe itself will quickly become damaged if put in the dishwasher. Rinse everything with warm water, and you can even use a little mild detergent here and there.

Even filtered water eventually causes limescale to build up inside a coffee maker, so you’ll need to descale the Ratio Six every so often. There’s no way for the machine to let you know, but I’d say once a month is a safe bet.

You can use products like Urnex Descaling Solution or descaling powder, but I find that a vinegar and water solution works just as well. After all, what’s going to happen to those Urnex plastic bottles once they’re empty? I’ll give you a clue: it starts with land and ends in fill.

Ratio Six Coffee Maker Specifications

Ratio Six Coffee Maker
Manufacturer

Ratio

Model number

Six

Product category

Drip coffee maker

Housing material

Stainless steel with plastic parts

Color options

Stainless Steel, White

Carafe

Thermal

Keep warm function

No

Milk frother

User interface

Buttons and dials

App

Removable water reservoir

Water reservoir capacity

44.0 fl oz / 1.3 l

Brew capacity

40 fl oz / 1183 ml

Single cup function

Reusable coffee filter

Coffee pod compatible

Brew styles

1

Pre-infusion

Adjustable coffee temperature

Coffee strength adjustment levels

Hot water function

Water filter

Power consumption

1400 W

Weight

8.0 lb / 3.6 kg

Dimensions

14.3 x 6.8 x 13.5 in
36.3 x 17.3 x 34.3 cm

Warranty

5 years

SCA certified home brewer

Notes

Included Accessories: Removable power cord, User guide, Catcher for filter basket, Heat shield/lid for filter basket, Ratio microfiber towel, 4 paper filters.

Current price on Amazon

$295.00

BUY NOW ON AMAZON

Ratio Six Coffee Maker vs Other Ratio Coffee Makers

No Ratio Six coffee maker review would be complete without a quick look at the manufacturer’s other coffee makers. Let’s see how the Portland company’s other offerings compare to the Ratio Six.

Ratio Six Coffee Maker vs Ratio Eight

Ratio 8 Coffee Maker vs Ratio 6.

The Ratio Eight is the manufacturer’s original coffee maker, and it’s where all the hype surrounding this company began. Instead of a filter basket and carafe, the Ratio Eight brews directly into a hand blown borosilicate glass carafe that looks just like a Chemex.

In fact, the Ratio Eight uses Chemex paper filters, although you can also use a Kone reusable stainless steel filter

As you might imagine, the Ratio Eight is a beautiful machine, although I’m not the biggest fan of its wooden accents. That’s just a matter of taste, though.

The Ratio Eight costs $565 on the manufacturer’s website, which is very serious money for a coffee maker.

Still, if you consider the fact that the machine is assembled by hand in Portland using the very highest quality materials, the price seems a little more reasonable.

Ratio Six Coffee Maker vs Ratio Eight Thermal Set

Ratio Eight Thermal Coffee Maker vs Ratio Six.

If money’s no object, you might as well just go with the Ratio Eight Thermal Set. This coffee maker features a hand blown borosilicate glass water reservoir, for crying out loud! You can even select from three different hardwoods for the accents. Of course, you could always just completely redesign and redecorate your kitchen to accommodate the coffee maker. Don’t tempt me!

As the name suggests, the Ratio Eight Thermal Set comes with a sleek insulated carafe and has the same brewing capacity as the Ratio Six.

The machine brews using a ceramic pour over dripper resembling a Hario V60. You can use paper filters, and there’s also a stainless steel Ratio Kone filter in the box.

The Ratio Eight Thermal Set costs $795 on the manufacturer’s website

Ratio Coffee Maker Comparison Chart

Ratio Six Coffee MakerRatio EightRatio Eight Thermal
Manufacturer

Ratio

Ratio

Ratio

Model number

Six

Eight

Eight Thermal

Product category

Drip coffee maker

Drip coffee maker

Drip coffee maker

Housing material

Stainless steel with plastic parts

Stainless steel with plastic parts

Stainless steel

Color options

Stainless Steel, White

Black, Oyster, Silver, White

Black, Silver, White

Carafe

Thermal

Glass

Thermal

Keep warm function

No

No

No

Milk frother

User interface

Buttons and dials

Buttons and dials

Buttons and dials

App

Removable water reservoir

Water reservoir capacity

44.0 fl oz / 1.3 l

40.6 fl oz / 1.2 l

40.6 fl oz / 1.2 l

Brew capacity

40 fl oz / 1183 ml

40 fl oz / 1183 ml

40 fl oz / 1183 ml

Single cup function

Reusable coffee filter

Coffee pod compatible

Brew styles

1

1

1

Pre-infusion

Adjustable coffee temperature

Coffee strength adjustment levels

Hot water function

Water filter

Power consumption

1400 W

1450 W

1450 W

Weight

8.0 lb / 3.6 kg

12.0 lb / 5.4 kg

14.0 lb / 6.4 kg

Dimensions

14.3 x 6.8 x 13.5 in
36.3 x 17.3 x 34.3 cm

14.3 x 9.6 x 13.5 in
36.3 x 24.4 x 34.3 cm

14.3 x 9.8 x 13.5 in
36.3 x 24.9 x 34.3 cm

Warranty

5 years

5 years

5 years

SCA certified home brewer

Notes

Included Accessories: Removable power cord, User guide, Catcher for filter basket, Heat shield/lid for filter basket, Ratio microfiber towel, 4 paper filters.

Included Accessories: Removable power cord, Silicone heat lid, User guide, 4 Chemex paper filters, Ratio microfiber towel.

Included Accessories: Removable power cord, Silicone heat lid, Stainless steel Ratio Kone filter, Ratio microfiber towel, User guide, Ceramic catcher for dripper, 4 Chemex paper filters.

Current price on Amazon

$295.00

$565.00

$795.00

Ratio Six Coffee MakerRatio EightRatio Eight Thermal
Manufacturer

Ratio

Ratio

Ratio

Model number

Six

Eight

Eight Thermal

Product category

Drip coffee maker

Drip coffee maker

Drip coffee maker

Housing material

Stainless steel with plastic parts

Stainless steel with plastic parts

Stainless steel

Color options

Stainless Steel, White

Black, Oyster, Silver, White

Black, Silver, White

Carafe

Thermal

Glass

Thermal

Keep warm function

No

No

No

Milk frother

User interface

Buttons and dials

Buttons and dials

Buttons and dials

App

Removable water reservoir

Water reservoir capacity

44.0 fl oz / 1.3 l

40.6 fl oz / 1.2 l

40.6 fl oz / 1.2 l

Brew capacity

40 fl oz / 1183 ml

40 fl oz / 1183 ml

40 fl oz / 1183 ml

Single cup function

Reusable coffee filter

Coffee pod compatible

Brew styles

1

1

1

Pre-infusion

Adjustable coffee temperature

Coffee strength adjustment levels

Hot water function

Water filter

Power consumption

1400 W

1450 W

1450 W

Weight

8.0 lb / 3.6 kg

12.0 lb / 5.4 kg

14.0 lb / 6.4 kg

Dimensions

14.3 x 6.8 x 13.5 in
36.3 x 17.3 x 34.3 cm

14.3 x 9.6 x 13.5 in
36.3 x 24.4 x 34.3 cm

14.3 x 9.8 x 13.5 in
36.3 x 24.9 x 34.3 cm

Warranty

5 years

5 years

5 years

SCA certified home brewer

Notes

Included Accessories: Removable power cord, User guide, Catcher for filter basket, Heat shield/lid for filter basket, Ratio microfiber towel, 4 paper filters.

Included Accessories: Removable power cord, Silicone heat lid, User guide, 4 Chemex paper filters, Ratio microfiber towel.

Included Accessories: Removable power cord, Silicone heat lid, Stainless steel Ratio Kone filter, Ratio microfiber towel, User guide, Ceramic catcher for dripper, 4 Chemex paper filters.

Current price on Amazon

$295.00

$565.00

$795.00

Verdict: Ratio Six Coffee Maker

Ratio 6

The best stainless steel coffee maker by far!

Borosilicate glass supply lines

Stainless steel body

Well thought out design

BPA free

Expensive

You'll be torn between Ratio and Moccamaster

By now, you will have gathered that the really gets me pumped. Although the price might seem a little steep to many of you, I’m of the opinion that spending $295.00 on this coffee maker is entirely reasonable. After all, such attention to detail and high quality materials is surely worth every penny.

I love preparing pour over coffee. Still, I hadn’t found an automatic coffee maker that could match the perfect cup results I get using a gooseneck kettle and a Chemex. Not until I got my hands on the Ratio Six that is. After having spent time testing this thing with some of my favorite beans, I can confidently say it’s the real deal. In fact, the Ratio Six has earned a permanent spot in my kitchen. Turns out, sometimes it’s worth believing the hype!

What’s your experience using the Ratio Six coffee maker? Do you love it as much as I do? I look forward to your comments!

Ratio Six Coffee Maker FAQ

Making delicious coffee with the Ratio Six coffee maker couldn’t be easier. Start by pouring the desired amount of water into the BPA free water tank. Place a filter in the filter basket, then add coffee grinds before placing the filter basket onto the coffee pot. Put these components under the shower head, then press the start button to begin the brewing process.

You should descale the Ratio Six coffee maker around once a month, depending on usage. That way it will continue to make excellent coffee. Use either water and white vinegar or a descaling solution and let sit in the water reservoir for 20 minutes. Run a brew cycle without ground coffee, then repeat the process with clean water to rinse the machine.

You can’t program a Ratio Six coffee maker and it doesn’t show the time. However, it does allow you to enjoy world class coffee!

If you’re using the Ratio Six coffee maker’s filter basket and thermal carafe to brew coffee, use a flat bottom paper filter, such as a Melitta 8-12 cup filter.

Start with a medium-fine grind size with the Ratio Six coffee brewer – the grind as you’d use for pour over coffee brewing. You can make slight adjustments to the grind, depending on how you like the results.

How much ground coffee you put in the Ratio 6 coffee maker depends on how many cups you’ll be brewing. The SCA’s golden ratio for brewing delicious coffee is 1:18, so you should use 55 grams of coffee per liter of water.

In terms of the materials used, the Ratio Six is more environmentally friendly than other high end coffee makers. There’s less BPA free plastic and more stainless steel. The Ratio Six even features borosilicate glass supply lines. Not only that, Ratio Six coffee makers don’t use coffee pods, which are notorious for taking up a lot of landfill space and polluting the Earth’s oceans and waterways.

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