It heats the water. You just press go.

Every other portable espresso machine has the same limitation: you need to bring hot water from somewhere else. A kettle, a thermos, a cafe. The STARSEEKER S58 eliminates that dependency. It has a 13,500mAh battery with built-in wireless heating — it boils its own water and pulls its own shot. Cold water in, espresso out. This is the machine that finally removes the last friction from portable espresso.

Wireless heating — no external water source needed

The S58 uses USB-C wireless heating technology to heat water to espresso brewing temperature inside the machine. You fill the reservoir with room-temperature water, press the button, and the machine does the rest. Ideal brewing temperature, maintained and delivered by the machine itself.

The 13,500mAh battery powers both the heating element and the extraction pump — a battery capacity so large that charging is an infrequent event. One full charge delivers enough power for an extended trip without needing to find a power source.

20-bar pressure — the S58 goes further

Standard espresso extraction requires 9-bar of pressure. The S58 is rated to 20-bar, giving it substantial headroom to deliver consistent 9-bar at the puck even accounting for pressure loss through the coffee bed. More importantly, it means the machine never struggles — even with a finely ground, tightly packed puck that would stall a lower-pressure portable machine.

The result is full crema, complete extraction, and a cup that rivals what you'd pull from a countertop machine.

"I've been chasing a true portable espresso solution for three years. Cold water in, proper espresso out — nothing else does this at this quality level."

Capsule or ground coffee — your choice

The S58 is compatible with both ground coffee (via the 58mm bottomless portafilter) and standard capsules. This is unusually versatile for a portable machine — most commit to one format. With the S58, you can use freshly ground specialty coffee at home and capsules while travelling when you don't want to bring a grinder.

The 58mm bottomless portafilter is compatible with standard accessories — any 58mm tamper or distributor you own will work. The bottomless basket also allows you to see the extraction pattern, which is valuable for diagnosing grind and tamp issues.

Key specifications

• Basket: 58mm, bottomless portafilter included
• Pressure: 20-bar maximum
• Battery: 13,500mAh
• Heating: Built-in wireless heating — heats its own water
• Charging: USB-C
• Compatible: Ground coffee (bottomless portafilter) and standard capsules

Who the S58 is for

The S58 is the right machine for anyone who wants absolutely zero friction in their portable espresso workflow. No kettle. No thermos. No hunting for hot water. It's the best choice for frequent travellers, people who work remotely from locations without kitchen access, and anyone who values maximum convenience without sacrificing shot quality.

The capsule compatibility makes it particularly useful for travel — you can pack a few capsules and pull good espresso from a hotel room, airport lounge, or car without any additional equipment at all.

If you occasionally want fresh ground coffee but also want capsule convenience, the S58 is the only portable machine that gives you both.

Both are excellent portable machines. The right choice depends on your workflow:

• S58 — choose this if you want zero hot water dependency. Self-heating, larger battery, capsule compatible. Best for travel and remote use.
• Super58 — choose this if you always have access to hot water and want a lighter, more compact setup at a lower price ($269 vs S58). Both use a 58mm basket.

The S58 is the more capable machine. The Super58 is the better value if your use case permits an external water source.