If you want the option to plumb your espresso machine into a water line later, buy a machine with a switchable water supply and a rotary pump; that combination lets you start on the internal reservoir today and convert to a permanent line whenever you're ready, no second machine required. The LUCCA M58 Sunto ($2,995) is a strong pick here: a compact E61 dual boiler built by Quick Mill in Milan, with a whisper-quiet rotary pump and a switchable water supply, run it on the built-in 3L reservoir now and plumb directly to your line later (the braided line for plumbed operation is sold separately). Avoid reservoir-only machines with vibratory pumps; they're built to draw from a tank, not accept pressurized line water, and can't be converted. Before you buy, figure out where the machine will live and what your water quality is like; Clive Coffee's team will talk through both on the phone.
Maybe you're not ready to run a water line to your machine today. Maybe your kitchen isn't set up for it, or you're renting, or you just want to start simple and grow into a more permanent setup down the road. That's a smart way to think about it, as long as you buy a machine that can actually make the switch. Here's the catch: not every espresso machine can be plumbed in, and the ones that can vary quite a bit in how they get water from your line to your cup. This article walks through exactly what makes a machine "plumb-ready," why it matters, and what to look for so you don't box yourself in.
The Short Answer: Buy a Switchable Machine With a Rotary Pump
If plumbing in is a "someday" goal, the single most important thing to look for is a machine designed to run on both a reservoir and a direct water line, which is often called a switchable water supply. This lets you start with the internal tank now and convert to plumbed operation whenever you're ready, without buying a whole new machine. The second thing to look for is the right pump type, because the pump is what determines whether a machine can even accept water from a pressurized line in the first place. Get those two things right, and everything else is detail.
It's worth being honest about the alternative, too. Some machines are built as direct-plumb only, no reservoir at all, designed for permanent installation with a continuous water supply. Those are excellent for the right person, but they don't give you the "start on a tank, plumb in later" flexibility this question is really about. So if you're not ready to commit to plumbing on day one, a switchable machine is the path.
How Machine Water Supply Actually Works
Every espresso machine needs to move water from a source, through a pump that builds pressure for brewing, and into the boiler and group head. The difference between a reservoir machine and a plumbed machine is really about where that water starts and how the pump is fed.
A reservoir machine pulls water from an internal tank, typically something you fill by hand and top off regularly. A plumbed machine draws directly from your home's water line, so you never have to refill it. A switchable machine can do either, which is the whole point for a buyer planning ahead.
The pump is the piece that matters most here. There are two common types, and they behave very differently when it comes to plumbing:
- Vibratory pumps are compact and common in reservoir-fed machines. They're built to draw water from a tank.
- Rotary pumps are quieter, more durable, and offer commercial-grade performance. Just as importantly, they're the pump type used in plumbed and switchable machines designed for continuous water supply. The switchable machines Clive Coffee carries, such as the LUCCA M58 Sunto, the LUCCA A53 Pro, the Profitec DRIVE, and the ECM Synchronika II, all use rotary pumps.
The practical takeaway: if a future water line is part of your plan, a rotary pump is the feature most closely tied to that capability. A rotary pump also happens to run quieter than a vibratory one, as Clive Coffee's team likes to point out, a rotary pump won't wake the household during a 6 a.m. shot, so you get a nicer daily experience even before you ever plumb in.
A Switchable Machine That Gets It Right: the LUCCA M58 Sunto
The LUCCA M58 Sunto ($2,995) is a good example of the switchable, rotary-pump combination in action. Built by Quick Mill in Milan, it's a compact E61 dual-boiler (a 0.75L brew boiler and a 1.5L steam boiler with independent PID) that runs on a whisper-quiet rotary pump and a switchable water supply: plumb it directly to your line, or run it on the built-in 3-liter reservoir. That's exactly the "start on the tank, plumb in later" flexibility this decision is about. It also handles the drain side well; its drainable drip tray comes with a drain kit included, so hands-off operation doesn't require chasing down extra parts. The braided line needed for plumbed operation is sold separately, which is the one thing to plan for.
What to Look for When You're Buying for a Future Plumb-In
Here's how Clive Coffee's team frames the decision when someone wants to leave the door open for plumbing later. Work through these in order.
1. Confirm the water supply is "switchable," not reservoir-only. This is the make-or-break spec. A switchable machine lets you run on the built-in reservoir now and plumb directly into your water line whenever you're ready. A reservoir-only machine, no matter how good, can't be converted, so if flexibility matters, rule those out early.
2. Check the pump type. As covered above, a rotary pump is the pump associated with plumbed and switchable operation. It's the quieter, more durable choice, and it's what you want feeding a machine off a pressurized line.
3. Find out what the conversion actually requires. "Switchable" doesn't always mean "everything's in the box." Plumbing in usually requires a dedicated water line, often a braided line with the correct fitting, and that piece may be sold separately. The LUCCA M58 Sunto, for instance, needs a separate braided line (or the LUCCA M58 Direct Plumb Kit at $165), the LUCCA A53 Pro uses the A53 Pro Direct Plumb Kit ($95), and the La Marzocco Linea Mini plumbs in with the La Marzocco Plumb-in Kit ($300). Knowing this ahead of time means there are no surprises on the day you decide to convert.
4. Think about where the machine will live long-term. Plumbing in means the machine stays put and needs access to a water line. If you know roughly where the machine will end up, you can plan the plumbing route now, even if you don't run it for months.
5. Consider a drain, not just a supply. Water going in is only half the picture. Many plumbed setups benefit from a drainable drip tray so you're not emptying a tray by hand, which somewhat defeats the purpose of never touching the water again. Some machines include a drain kit (the M58 Sunto does), while on others, a drip tray drain is an optional add-on, so factor that into your plan if hands-off operation is the goal.
6. Water quality still matters, maybe more. When you plumb in, you're committing your machine to whatever comes out of your tap, continuously. Hard or poorly filtered water is the enemy of any espresso boiler, so aim for soft, filtered water in the 35 to 85 ppm range. Planning your filtration is part of planning your plumb-in, and it's exactly the kind of thing Clive Coffee's team will talk you through before you commit.
Common Mistakes and Misconceptions
"Any machine can be plumbed if you're handy enough." This is the big one, and it's wrong. Plumbing readiness is a design decision, not a modification. A reservoir-only machine with a vibratory pump built to draw from a tank isn't meant to accept pressurized line water. Trying to force it isn't a clever hack; it's a way to create problems. If plumbing is in your future, buy it up front.
"Switchable means I can plug in a water line with nothing else." Often, you'll need the correct braided line and fitting, and sometimes a drain kit for the drip tray, to get the full hands-off experience. These are small pieces, but they're pieces, so know what your specific machine needs before conversion day.
"Plumbing in is only for cafés." Not at all. Plenty of home baristas plumb in for the simple luxury of never refilling a tank and never emptying a tray. It's especially appealing for households that go through a lot of milk drinks each morning or entertain frequently. The tradeoff is permanence: a plumbed machine wants a fixed home with line access, so it suits people who've settled on their setup.
"I should just buy direct-plumb-only to be safe." Only if you're ready to plumb from day one. A direct-plumb-only machine has no reservoir to fall back on, so it's the right call when you can install a continuous water supply immediately, not when you're planning for "later." For the eventual-plumb-in buyer, switchable is the more forgiving choice.
Summary and Your Next Step
If you want the option to plumb your espresso machine into a water line down the road, buy a machine with a switchable water supply and a rotary pump, a combination the LUCCA M58 Sunto, LUCCA A53 Pro, Profitec DRIVE, and ECM Synchronika II all offer. That combination is what lets you start on the internal reservoir today and convert to a permanent line whenever you're ready, no second machine required. Then plan the small stuff in advance: the braided line and fitting you'll need, whether you want a drainable drip tray for truly hands-off operation, and how you'll filter the water you'll be feeding your machine forever.
The best next step is to figure out where your machine will live and what your water is like before you buy, because those two answers shape everything else. And if you want a second opinion from people who've actually plumbed these machines in, this is exactly the kind of decision Clive Coffee's team likes to talk through on the phone. Call before you buy, and you'll walk into the purchase already knowing what your future plumb-in will take.