Water guide · manufacturer-first · region matters

What water should you use in an espresso machine?

Water affects taste and mineral buildup, but “filtered” is not a complete specification. The right choice depends on your local water and the machine’s instructions for hardness, filter use, and maintenance.

US maker guidance with model-specific caveatChecked Oct 31, 2026

Concept illustration of a home espresso machine and coffee grinder — Concept illustration; it does not depict a water test or specific machine instructions.

Short answer: Start with the exact machine’s manual and water-hardness guidance. If it provides a test strip or setting, use it as instructed. Do not assume distilled or nearly mineral-free water is suitable: Breville’s general support guidance says to avoid water with little or no mineral content and to follow the recommendations for the specific model. Other manufacturers may differ.

Why water choice belongs in the buying decision

The water is part of the machine’s daily operation. A maker may use hardness information to set a maintenance reminder, recommend a filter, or give instructions for choosing another water source. That makes filter availability and replacement cost relevant when you compare machines, especially if your tap water is hard.

Water also affects the taste of the cup. A change in source can change both the mineral content and the flavor, so record what you use when adjusting coffee rather than changing several variables at once.

A safe way to choose a water source

Find the exact model manual and note its water-quality, hardness, filter, and descaling guidance.
If the machine includes a hardness strip or setting, test and configure it exactly as instructed.
Check your local water supplier’s published water information if you need a starting point; the values can vary by area and over time.
If the maker suggests filtered or bottled water for your measured hardness, compare the product’s mineral information and retest if the manual recommends it.
Use fresh, cold water and replace the machine’s filter on the schedule specified for that model.

“Filtered” can describe many different processes. A filter is not proof that the resulting water matches a machine’s recommended hardness or mineral content.

Do not copy another owner’s descaling interval

Water hardness and machine alerts can differ. Breville’s Bambino Plus manual, for example, gives different suggested descaling intervals at different hardness levels. Those timings are specific to that machine’s stated settings; they are not a universal calendar for espresso equipment. Follow the warning and instructions for your exact model instead.

If you change the water source, check whether the manual asks you to re-test, change a hardness setting, replace a filter, or adjust a maintenance reminder. Keep a brief note of the water source and filter-change date.

Questions to ask before ordering a machine

Does this model include a water filter, and what replacement part does it use?
Does it include a hardness strip or configurable hardness level?
What does the manual recommend for the water available where I live?
How does the machine signal cleaning or descaling?
What is the ongoing cost and availability of the correct filters and descaler?

Read our cleaning and maintenance guide before treating water advice as a fixed schedule.

Sources and limits

Breville Support: what type of water should I use? describes fresh cold water, model-specific hardness guidance, filter care, and avoiding distilled water. See the Bambino Plus manual for that model’s filter and descaling details.

Water requirements vary by manufacturer and model. This page does not test local water or prescribe a universal recipe. Follow your machine’s manual and local water information. No affiliate links or sponsorships.