Breville the Dual Boiler

MakerBreville
BoilerDual boiler
Brew boilerNot listed
Steam boilerNot listed
Water tank2.48 L (our conversion)
Plumb-inNot listed
Voltage (US)110-120V
Maker's water filterClaroSwiss water filter

What water does this machine require?

Breville hasn't published a limit our check can use for this machine yet, so the check can't give it a result. Whatever the maker does say is quoted below.

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Will my water work with this machine?

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The maker's water guidance

What the maker says this machine needs from its water. This is machine care, not drinking-water advice.

From Breville's guidance for this model.

  • Very pure water

    “DO NOT use highly filtered, demineralized or distilled water in this machine. This may affect the taste of the coffee.”

    the Dual Boiler Instruction Book - BES920 (US, file BES920_USCM_IB_X23_LR.pdf, PDF dated Feb 2023), p. 9, Installing the water filter. Source (opens in a new tab), saved October 22, 2026.

  • Hardness setting

    “Press UP or DOWN arrow to the required setting from ‘Hrd1’ (softest water) to ‘Hrd5’ (hardest water).”

    the Dual Boiler Instruction Book - BES920 (US, file BES920_USCM_IB_X23_LR.pdf, PDF dated Feb 2023), p. 10, Setting Water Hardness. Source (opens in a new tab), saved October 22, 2026.

  • Water filter

    “Replacing the water filter after three months or 10.6 USgal / 40L will reduce the need to descale the machine.”

    the Dual Boiler Instruction Book - BES920 (US, file BES920_USCM_IB_X23_LR.pdf, PDF dated Feb 2023), p. 9. Source (opens in a new tab), saved October 22, 2026.

  • Very pure water

    “Use only cold water in the water tank. Do not use any other liquids. Do not use highly filtered, demineralized or distilled water as this may affect the taste of the coffee and how the espresso machine operates.”

    the Dual Boiler Instruction Book - BES920 (US, file BES920_USCM_IB_Y23_LR.pdf, PDF dated Apr 2023), PDF p. 4, Important safeguards. Source (opens in a new tab), saved October 28, 2026.

From Breville's guidance for Breville espresso machines (US support article; no models named).

  • Total dissolved solids (TDS): 50–150 ppm

    “Water that lacks in mineral content can contribute to sourness and acidic taste in the espresso, it is recommended to use water that has mild amount of minerals like soft filtered water, spring water, well water, these types of water ideally measure in between 50-150 ppm (parts permillion) in dissolved solids.”

    Breville US Support article ka0QU000002VvldYAC (water for espresso machines), page text, article text, paragraph after the list of low-mineral waters. Source (opens in a new tab), saved October 28, 2026.

  • Very pure water

    “Water with little or no mineral content may affect the taste of your coffee and how the machine is designed to operate.”

    Breville US Support article ka0QU000002VvldYAC (water for espresso machines), page text, article text, after the list 'Avoid water with little or no mineral content'. Source (opens in a new tab), saved October 28, 2026.

  • Remineralization

    “Avoid using RO water if the filtration process removes nearly all of its mineral content. For applicable models, RO water may be suitable if some mineral content has been added back to the finished water.”

    Breville US Support article ka0QU000002VvldYAC (water for espresso machines), page text, article text. Source (opens in a new tab), saved October 28, 2026.

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