Rocket Espresso Rocket Giotto Fast

MakerRocket Espresso
BoilerHeat exchanger
Brew boilerNot listed
Steam boiler1.8 L
Water tank1.8 L
Plumb-inR version switchable; V version tank only
Voltage (US)115V
Maker's water filterNot listed

What water does this machine require?

Rocket Espresso publishes 2 limits our water check uses for this machine. Each is quoted in the maker's own words below.

Water limits for the Rocket Espresso Rocket Giotto Fast
WhatThe maker's limitWhere it comes from
Total hardness40–70 ppm (our conversion of the maker's 4–7 °fH)Written for this model. The maker's words for Total hardness.
Total hardness35.7–71.4 ppm (our conversion of the maker's 2–4 °dH)Written for this model. The maker's words for Total hardness.

Will my water work with this machine?

Add your water from a test strip, a report or your city's numbers, and we'll check it against the maker's limits above. It stays in this browser.

Check my water for this machine

The maker's water guidance

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

From Rocket Espresso's guidance for this model.

  • Total hardness: 4–7 °fH

    “The water hardness must be between 4 - 7 °f (French) / 2 - 4 °d (German).”

    Rocket GIOTTO-MOZZAFIATO FAST user and maintenance manual, multilingual (PDF created 2026-01-30, 42 pp.; Rocket document hosted by Seattle Coffee Gear), English section, par. 3.5 Technical data, "Water", p. 52. Source (opens in a new tab), saved October 28, 2026.

  • Total hardness: 2–4 °dH

    “The water hardness must be between 4 - 7 °f (French) / 2 - 4 °d (German).”

    Rocket GIOTTO-MOZZAFIATO FAST user and maintenance manual, multilingual (PDF created 2026-01-30, 42 pp.; Rocket document hosted by Seattle Coffee Gear), English section, par. 3.5 Technical data, "Water", p. 52. Source (opens in a new tab), saved October 28, 2026.

  • Water type

    “The machine has to operate with clean soft drinking water. Never attempt to operate the machine with water of a hardness other than that specified in paragraph 3.5.”

    Rocket GIOTTO-MOZZAFIATO FAST user and maintenance manual, multilingual (PDF created 2026-01-30, 42 pp.; Rocket document hosted by Seattle Coffee Gear), English section, par. 4.1.1 (tank) and 4.1.2 (mains), pp. 54-56. Source (opens in a new tab), saved October 28, 2026.

  • Plumbed-in water

    “The manufacturer recommends the use of an inline filter.”

    Rocket GIOTTO-MOZZAFIATO FAST user and maintenance manual, multilingual (PDF created 2026-01-30, 42 pp.; Rocket document hosted by Seattle Coffee Gear), English section, par. 4.1.2 Connection from mains, p. 56. Source (opens in a new tab), saved October 28, 2026.

  • Very pure water

    “Use fresh, filtered water to fill the tank. Do not use distilled water (see par. 3.5 page 52).”

    Rocket GIOTTO-MOZZAFIATO FAST user and maintenance manual, multilingual (PDF created 2026-01-30, 42 pp.; Rocket document hosted by Seattle Coffee Gear), English section, ch. 8 maintenance, water tank, p. 68. Source (opens in a new tab), saved October 28, 2026.

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Specs read from the maker's or seller's page.