The World’s Smallest Coffee Machine: Piamo

If you’ve ever worked in an office with weak coffee machines—or none at all—you know the pain of wanting a proper espresso without walking blocks to the nearest café. For some, that meant relying on instant coffee or giving up altogether. But what if there was a way to make real espresso without an outlet, a machine, or even much space?

Piamo is a three-part microwaveable coffee device that brews a shot of espresso in just 30 seconds. It’s made up of a cup, a built-in grinder chamber, and a water reservoir—and it works entirely with your microwave.

What Is Piamo?

Piamo is marketed as the world’s smallest coffee machine. It’s not electric, doesn’t plug in, and doesn’t use pods. Instead, it separates into three components: a cup that doubles as the serving vessel, a chamber where you load coffee grounds, and a reservoir for water. To brew, you fill it with fresh coffee and water, assemble it, and heat it in the microwave. In around 30 seconds, steam from the heated water passes through the coffee grounds, extracting an espresso that drips directly into the cup.

How Does Piamo Make Espresso in a Microwave?

The magic happens through steam pressure. When microwaved, the water in the reservoir turns to steam. That steam builds pressure and forces its way through the coffee grounds in the middle chamber. This is essentially a form of steam-driven espresso extraction, similar in principle to vintage stove-top brewers—but miniaturized and adapted for microwave heating. The result is a small shot of espresso that collects in the base of the cup.

The entire process takes roughly 30 seconds. No filters, no electricity, and no complicated setup. Just add ground coffee, pour in water, and microwave.

Cleaning and Portability

One of the biggest advantages of Piamo is how easy it is to clean. The entire unit is dishwasher safe, meaning no scrubbing or messy disassembly. That also adds to its portability. Since it breaks into three parts and has no electrical components, you can toss it in a bag and use it anywhere there’s a microwave—offices, hotel rooms, dorms, or even some campsites with access to power.

Why This Design?

The creators of Piamo were reportedly frustrated with limited or low-quality coffee options at work and found nearby cafés inconvenient. Traditional office coffee machines were often disappointing, and they needed a solution that didn’t rely on bulky equipment or outlets. The idea came together when they realised most offices already had something powerful enough to brew coffee: a microwave. So they designed Piamo specifically to use that existing heat source for fresh espresso.

What You Need to Use Piamo

To make it work, you’ll need:

• Fresh coffee grounds (the finer the better, akin to an espresso grind)
• Cold water
• A standard microwave (no special settings required)

You load the coffee into the middle chamber, pour water into the bottom, attach the cup, and microwave the whole device. No paper filters, no pods, and no electricity other than the microwave itself.

Frequently Asked Questions

How long does it take to make espresso with Piamo?

It takes approximately 30 seconds to brew a shot of espresso using Piamo in the microwave. The entire process, from heating to dripping, completes in that short window.

Do you need electricity to use Piamo?

No, Piamo doesn’t require electricity. It uses your microwave to generate steam, which then brews the espresso. It’s completely electric-free apart from needing access to a standard microwave.

Is Piamo easy to clean?

Yes. The whole unit—including the cup, brewing chamber, and water reservoir—is dishwasher safe. This makes cleaning simple and convenient compared to traditional espresso machines.

Can you use Piamo anywhere?

As long as there’s a microwave available, you can use Piamo. It’s portable, compact, and breaks into three parts, making it suitable for offices, hotel rooms, dormitories, and some travel situations.

What kind of coffee grind should you use with Piamo?

Piamo works best with a fine coffee grind, similar to what you’d use for espresso. Since it relies on pressure from steam, a finer grind helps ensure proper extraction in the short brew time.

Does Piamo make real espresso?

Piamo produces a concentrated coffee shot using steam pressure, similar to traditional espresso methods. While it’s not pump-driven like high-end machines, it aims to deliver a true espresso-style result in a microwave.

Recommended FrontStreet Coffee Beans for Microwave Espresso

For use with Piamo, try FrontStreet Coffee’s Classic Blend for a balanced espresso with notes of butter, nuts, and dark chocolate—perfect for a quick office shot. If you prefer brighter fruit tones, the Ethiopia Humbera SOE highlights citrus and floral qualities, while the Black Cocoa Blend brings rich cocoa and spice. All three roast profiles respond well to the steam-brew method and are ideal for making intense, flavorful espresso in constrained environments. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.