Live EventCoffee TV
23 - 26 September 2021 / The Truman Brewery
14 September 2021
The Science Behind Sustainable Coffee Brewing (CO2, kWh and more)
At 3Temp, we love facts and figures. Engineers by trade, our founders are passionate about combining science, statistics and sustainability, creating batch brewers for a new generation of coffee lovers.


In today’s article, we’ll show you how the HIPSTER could help one company reduce their CO2 emissions by the equivalent of 212 million plastic coffee cups each and every year while saving money and producing better coffee.

Hot Water, On-Demand

The 3Temp ethos of "quality in cup" has always directed the design of our brewers, focusing on giving black coffee the attention it deserves without sacrificing quality at any stage of the process. One of the core features of our products is that they pump in new water for every brew which is heated just seconds before it hits the grind. 



We’ll go into the financial and environmental benefits of that shortly, but first, let’s discuss what it means for your coffee. 

Why Go Tankless?

Something curious happens when you heat water. Not only does the mineral content begin to separate, but it also loses its oxygen content. Water kept heated in a tank gradually loses more and more of its mineral and oxygen content, completely changing its flavour profile. This was just one of the reasons we knew we wanted the HIPSTER to be a tankless design. By using fresh water and heating it at the time of brewing, the end cup of coffee is vastly improved compared to traditional batch brewing methods. After all, coffee is 98% water - we think that matters!

Not only does a tank-equipped brewer produce poorer quality coffee, but it also consumes much more energy, impacting both your energy bill and your carbon footprint. 

The Bigger Picture

Expanding one successful coffee shop into a chain is the dream for most shop owners, so creating a sustainable business model that looks toward the future is a must. Using outdated equipment with heated plates or large water tanks will not only put a limit on the quality of your coffee but on your ability to operate sustainably too. 

An idling coffee brewer uses about 30 watts of energy per hour to keep the water at temperature. 

“But it’s only 30 watts”, I hear you say, “Does it matter?” Yes, it really does. Let’s find out what happens to those 30W when we look at the bigger picture.

It only takes 7-10 minutes to brew one gallon of coffee, so if you brew six gallons per day (that’s 182 cups of 125ml coffee), your brewer is doing its job for a total of one hour and spending 23 hours idle. Over a year, that’s 251,850 watts. Conversely, a HIPSTER brewer uses just 32,740 watts. 

Now, let’s imagine that a chain like Starbucks, with around 30,000 sites, switched out their old, tank-equipped brewers in favour of a modern tankless brewer like the 3Temp HIPSTER.

What would this mean in an environmental impact model? 

Take those 30,000 coffee shops, each using 30W an hour to heat their tanks; that’s 900,000W (900kW) every hour. Based on the average cost of power, they’re paying 180 EUR/USD every hour, day and night, purely for the brewers to sit idle.



Saving CO2 With Every Brew 

At the beginning of this article, we claimed that by switching to a HIPSTER brewer, the equivalent saving of 212 million plastic cups could be made. We’re not the kind of company to throw around statements without backing them up, so let’s deep dive into those figures (look away now if numbers aren’t your thing).

According to the EEA, the average greenhouse gas emissions created in order to produce 1kWh of electricity in the EU is 275g/kWh. In the US, this is even higher due to the use of coal power plants. So, we’ll meet somewhere in the middle and call it 290g/kWh.

Still with us? Good.

So, knowing how much CO2 is released to create 1kWh of electricity, we can ascertain that the 900kWh Starbucks might use to keep their tank-equipped machines on idle is equivalent to a whopping 261kg of CO2 released every hour in wasted energy. 

According to Resource, the CO2 footprint created to produce ONE plastic coffee cup is around 10.3g, although this figure is even higher for compostable cups at approximately 13g. So, again, by the powers of deduction (and a handy calculator), we know that Starbucks wastes the CO2 equivalent of 25,339 plastic cups. Every. Single. Hour. All while paying 180EUR an hour for the pleasure.

Let’s extrapolate on that and take a look at what they’re losing annually, shall we? Take those 25,339 cups and multiply it by 8395 hours, and we’re now looking at the CO2 equivalent of… wait for it… 212,720,905 plastic cups, plus the €1.5million bill just for the machines sitting idle.

Suddenly, that idle function doesn’t seem quite so efficient, does it?

One Last Calculation...

Now, you may have realised by now that we love a good equation almost as much as we love good coffee, so here’s another way of looking at it. 

Volvo is known for its well-manufactured, reliable machines. A bit like another Swedish-born brand we know… Based on figures for the Volvo V60 Estate, one vehicle releases 157g of CO2 every kilometre it travels. 

Based on that, the Volvo would need to drive 1662km to emit the same amount of CO2 as Starbucks each hour. So, over the course of the year that those Starbucks brewers are keeping their tanks idle, the Volvo would need to drive 13,952,390km to keep up with their emissions. Struggling to visualise what that would look like? That’s 218 laps around the equator or 4982 road trips from the USA’s east coast to the west coast.

Now, you might not be the CEO of Starbucks, but that’s not to say that the choices you make for your business don’t matter. The general public is voting with their feet when it comes to supporting sustainable businesses. With so much competition among coffee shops, serving a superior cup of coffee and being eco-conscious are two assets that will only become more important as time goes on. 

And, if you are the CEO of Starbucks, no hard feelings, give us a call and let’s talk about future-proofing.

To learn more about the 3Temp HIPSTER and choose the right product for your business, call or email one of the team on +46 570 711 300 or support@3temp.com.

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