WPM Primus – Espresso Machine with Gear Pump and Pressure Profiling
Pulling espresso and steaming milk at the same time, guiding the pressure with the paddle and watching the curve live on the display: you can buy the WPM Primus in Switzerland from us, with showrooms in Bern and Zurich.
The Primus (model KD-360X) combines a 0.8-litre boiler with two thermoblocks, a gear pump and a 58 mm metal brew group in a stainless steel housing that is 23.5 cm wide. WPM is based in Hong Kong and makes milk pitchers as well as machines.
Features of the WPM Primus
Hybrid heating system
A 0.8-litre boiler, a PID-controlled thermoblock and a dedicated SuperSteam thermoblock for steam work together. According to WPM, this ensures stable temperature and lets you pull espresso and steam milk at the same time.
Gear pump
A quiet, powerful gear pump instead of a vibration pump. It allows precise control of the extraction pressure and with it an adjustable flavour profile.
Adjust pressure in real time
A pressure sensor provides real-time feedback, and the display shows target and actual pressure as a curve over time. You choose a preset profile or create and save your own.
The details in everyday use
Five brew modes on the touchscreen
In Manual you control the pressure with the brew paddle, Semi-Auto works with up to four pressure stages, Auto brews according to a programmed pressure-time profile, Constant holds the pressure steady, and M-Flow regulates the flow via the paddle. Pre-Infusion is adjustable. The library stores up to 30 profiles, and the history keeps the last 10 shots.
58 mm metal brew group
The brew group takes portafilters in the standard 58 mm size. Included are a portafilter with a double spout, three baskets for 7–13 g, 16–18 g and 18–20 g, and a blind basket for backflushing.
Steam in seven levels
The steam wand rotates 360° and has a two-hole tip. You set the steam power from 1 to 7 in the menu. Steam is started with its own button.
External water tank
The 1.8-litre tank sits next to the machine and is connected via a hose. According to the user manual, the Primus must not be connected to the water mains or to other pressurised water sources.
Cleaning mode and reminder
The Primus reminds you to clean after an adjustable volume of water (10 to 150 litres, depending on water hardness). The cleaning mode flushes the brew circuit with fresh water and descales the steam thermoblock separately. According to WPM, descaling agent never goes into the brew circuit.
Firmware via Wi-Fi
You download updates to the machine software over a Wi-Fi connection. Language, temperature, steam power, pressure response time and sleep mode are set in the menu.
At a glance
| Model |
WPM Primus, KD-360X |
| Heating system |
0.8 L boiler, PID thermoblock, SuperSteam thermoblock |
| Pump |
Gear pump |
| Brew modes |
Manual, Semi-Auto (up to 4 pressure stages), Auto, Constant, M-Flow; Pre-Infusion adjustable |
| Profiles |
Up to 30 saved, history of 10 shots |
| Brew temperature |
70–98 °C |
| Brew group |
58 mm, metal |
| Steam |
360° wand, two-hole tip, 7 levels |
| Controls |
Colour touchscreen, brew paddle |
| Water |
External water tank 1.8 L, no plumbed-in connection |
| Warm-up |
We recommend at least 10–15 minutes until the brew group and portafilter are heated through |
| Housing |
Stainless steel, black or silver |
| Dimensions |
490 × 235 × 400 mm (D × W × H) |
| Weight |
21.5 kg |
| Voltage and power |
220–240 V, 50–60 Hz, 2400–2540 W |
| Included according to the user manual |
Portafilter with double spout, baskets 7–13 g, 16–18 g, 18–20 g, blind basket, cleaning needle, cleaning brush, tamper, tamping mat, cloth |
Who the WPM Primus is made for
For everyone who often makes milk drinks and needs espresso and milk foam one after the other or at the same time, without waiting. And for everyone who wants to see how pressure changes espresso: profiles can be saved, compared and adjusted. If you would rather simply pull a shot, start with the paddle in Constant mode. Both paths are valid, and our opinion is one of many.
We extract by weight ratio. We grind fine, start at 14.5 grams and work our way up from there, usually to 17 grams, at a ratio below 1:2. Then we adjust the profile to the taste. Nobody needs a Primus. You want one, for the control over pressure or for the steam, or you don't.
Our coffee machine comparison with advice tool shows you which type of machine suits you. A free advice appointment narrows down the choice in conversation. Online, Jackson, our AI advisor, helps you choose. In our Espresso Machine and Grinder Comparison, we show you machines and grinders in operation, side by side, in an hour reserved for you, WPM in Bern.
You will find more from WPM in our WPM Wellhome Pro Collection, and further machines under Coffee Machines.
What goes well with it
For everyone who wants affordable and precise grinders: models from Varia or the hand grinders from Comandante. If you want a grinder with large flat burrs: Weber Workshops or Option-O. You will find all models under Coffee Grinders.
For everyone who wants compact and precise scales: Normcore. If you want an app and flow-rate display: Acaia. For steaming, pitchers from our Milk Pitcher Collection are a good match, and for care, our Machine and Grinder Cleaning.
Financing available. Delivery in 2–4 business days, across Switzerland and to Liechtenstein, or Click & Collect in Bern and Zurich. You will find the conditions for the introductory course with a machine purchase further down this page.
Frequently asked questions about the WPM Primus
Can I pull espresso and steam milk at the same time with the WPM Primus?
Yes. The steam comes from a dedicated SuperSteam thermoblock, while the brew circuit works with the boiler and the PID thermoblock. WPM explicitly describes the system as designed for brewing and steaming at the same time.
Is pressure profiling on the Primus complicated?
No. In Constant mode the Primus brews at constant pressure like a classic machine, and a pull on the paddle starts the shot. If you want to go deeper, use Semi-Auto with up to four pressure stages, Auto with saved profiles, or guide the pressure manually with the paddle.
Can I connect the WPM Primus to the water mains?
No. The Primus works with the included external water tank (1.8 L). According to the user manual, it must not be connected to the water mains, to pressurised water filters or to other pressurised lines.
Which grinder suits the WPM Primus?
Any grinder that grinds fine enough for espresso. Affordable and precise: models from Varia or a hand grinder from Comandante. If you want large flat burrs: Weber Workshops or Option-O. Our advice tool helps you choose.
How do I look after the WPM Primus?
After every shot, run water through the group, briefly purge the steam wand and wipe it down. To backflush, insert the blind basket and flush in Manual mode. The cleaning mode flushes the brew circuit with fresh water only, and you descale the steam thermoblock separately. You set the cleaning reminder according to your water hardness.
Can I see the WPM Primus before buying?
Not every model is set up at all times in our showrooms in Bern (Gerberngasse 44) and Zurich Oerlikon (Hagenholzstrasse 50b). Write to us before your visit at [email protected] and we will check whether the Primus is on site. In our Espresso Machine and Grinder Comparison, we show you several machines in operation, side by side.
Tip from the roastery: For cappuccino and flat white from the Primus, we roast Cozy Chocolate and Nutty Delight: chocolate and nut hold their own against the milk. If you are looking for maximum body without acidity, reach for Very Nutty. For a fruity experience in your espresso, there is Wild Peach. That's our recommendation, one of many.
