Do plumbed machines still need descaling?

Yes, unless filtration is doing essentially all the work. They also need it more often per unit of time, because volume is higher.

What filter do I need for a plumbed machine?

One rated by capacity for your measured hardness, not a generic cartridge. Suppliers publish capacity against hardness — the same cartridge lasts far less in hard water.

Can I plumb any espresso machine?

No. Only machines the manufacturer designs for it, usually with a rotary pump. Machines with a tank and a vibratory pump generally cannot be converted safely.

Do I need a pressure regulator?

If mains pressure is high, yes. Machines specify a maximum inlet pressure and exceeding it stresses seals and valves.

Water for a Plumbed-In Machine

Updated July 28, 2026

A plumbed machine drinks far more water than a tank machine and has no one checking it, so filtration stops being optional. Fit a treatment system sized to your volume and hardness, and know your water's numbers before you connect anything.

Why plumbing raises the stakes

A tank machine gets a visual inspection every time somebody refills it. A plumbed machine runs unattended, so scale accumulates without anyone noticing until performance drops.

Volume is also much higher, and scale accumulates in proportion to volume. The same water that gives a tank machine a three-month interval will scale a busy plumbed machine considerably faster.

What to fit

A cartridge system rated in litres or gallons for your hardness, not a generic 'coffee filter'. Suppliers publish capacity tables against hardness — a cartridge rated for 5,000 litres at moderate hardness may manage a fraction of that in hard water.

Softening versus scale-inhibiting: softeners exchange calcium for sodium; inhibitors keep minerals in suspension so they do not deposit. Both are used, and manufacturers usually specify a preference.

A pressure regulator if your mains pressure is high, and a shut-off valve you can actually reach.

Know your numbers first

Measure or look up total hardness, and check with the machine's manufacturer what they require — some publish a target range and will decline warranty claims for scale damage outside it.

Log the installation date and cartridge capacity somewhere that is not one person's memory. On a plumbed machine, cartridge changes are the maintenance task most likely to be forgotten and most expensive to forget.

Related on espresso.compare

Frequently asked

Do plumbed machines still need descaling?: Yes, unless filtration is doing essentially all the work. They also need it more often per unit of time, because volume is higher.
What filter do I need for a plumbed machine?: One rated by capacity for your measured hardness, not a generic cartridge. Suppliers publish capacity against hardness — the same cartridge lasts far less in hard water.
Can I plumb any espresso machine?: No. Only machines the manufacturer designs for it, usually with a rotary pump. Machines with a tank and a vibratory pump generally cannot be converted safely.
Do I need a pressure regulator?: If mains pressure is high, yes. Machines specify a maximum inlet pressure and exceeding it stresses seals and valves.