Slayer Espresso Slayer Steam Single

MakerSlayer Espresso
BoilerDual boiler
Brew boiler0.8 L
Steam boiler2.4 L
Water tank2.5 L
Plumb-inSwitchable (plumbing kit sold separately)
Voltage (US)120V
Maker's water filterNot listed

What water does this machine require?

Slayer 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 Slayer Espresso Slayer Steam Single
WhatThe maker's limitWhere it comes from
Chlorideat most 30 ppmSlayer Espresso's guidance for its range, which it says covers this machine. The maker's words for Chloride.
Total hardnessat most 9 gpg (154 mg/L as CaCO3, our conversion)Slayer Espresso's guidance for its range, which it says covers this machine. The maker's words for Total hardness.
Shown, but not used to decide (11)

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 Slayer Espresso's general guidance.

  • pH: 7–9

    “Water Treatment Requirements ... pH: 7-9”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), requirements list. Source (opens in a new tab), saved October 28, 2026.

  • Total hardness: 2–6 grains

    “Water Treatment Requirements ... Total Hardness: 2-6 grains”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), requirements list. Source (opens in a new tab), saved October 28, 2026.

  • Total dissolved solids (TDS): 50–200 ppm

    “Water Treatment Requirements ... TDS: 50-200 ppm”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), requirements list. Source (opens in a new tab), saved October 28, 2026.

  • Total alkalinity: 40–100 ppm

    “Water Treatment Requirements ... Alkalinity: 40-100 ppm”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), requirements list. Source (opens in a new tab), saved October 28, 2026.

  • Chloride: up to 30 ppm

    “Water Treatment Requirements ... Chloride: <30 ppm”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), requirements list. Source (opens in a new tab), saved October 28, 2026.

  • Silica: up to 10 ppm

    “Water Treatment Requirements ... Silica: <10 ppm”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), requirements list. Source (opens in a new tab), saved October 28, 2026.

  • Chloramine: up to 0.1 ppm

    “Water Treatment Requirements ... Chloramine: <.1 ppm”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), requirements list. Source (opens in a new tab), saved October 28, 2026.

  • Total chlorine: up to 0.1 ppm

    “Water Treatment Requirements ... Chlorine: <.1 ppm”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), requirements list. Source (opens in a new tab), saved October 28, 2026.

  • Chloride: up to 30 ppm

    “Chlorides also encourage pitting corrosion, which causes damage to the machine. Incoming water should have no more than 30ppm chloride content.”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), Chloride paragraph. Source (opens in a new tab), saved October 28, 2026.

  • Hardness, highest: up to 9 grains

    “Reverse osmosis may be a good solution for water in the range of 6-9 grains of hardness and is mandatory for water above 9 grains.”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), Common Water Filtration Systems. Source (opens in a new tab), saved October 28, 2026.

  • Total hardness: 2–6 grains

    “The desirable range of hardness is 2-6 grains.”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), Calcium Carbonate paragraph. Source (opens in a new tab), saved October 28, 2026.

  • Water filter

    “All SLAYER Espresso Machines need to be connected to a carbon water filter to remove chlorine, sediments, odor, and undesirable tastes. This requirement is in addition to any other necessary water filtration systems.”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), Common Water Filtration Systems. Source (opens in a new tab), saved October 28, 2026.

  • Remineralization: 75–125 ppm

    “When blending minerals with the filtered water, target a TDS (total dissolved solids) value of of 75-125 ppm. Experiment with various TDS levels to determine what produces your preferred taste.”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), Reverse Osmosis paragraph. Source (opens in a new tab), saved October 28, 2026.

  • Water filter

    “Carbon filtration is necessary for all machines. For water with 3-5 grains of hardness, carbon filtration is likely the only necessary water treatment.”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), Carbon Filtration paragraph. Source (opens in a new tab), saved October 28, 2026.

  • Softened water

    “An ion exchange system should be used in combination with a carbon filtration system and is especially beneficial for water in the range of 6-9 grains of hardness.”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), Ion Exchange paragraph. Source (opens in a new tab), saved October 28, 2026.

  • Warranty

    “IMPORTANT: Damage to or failure of your machine due to inadequately treated water is not covered under warranty.”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), closing note. Source (opens in a new tab), saved October 28, 2026.

  • Testing

    “SLAYER recommends testing water pre-and-post filtration by an experienced espresso technician during routinely scheduled Preventative Maintenance.”

    SLAYER Water Treatment Requirements (Slayer support knowledge base article; created 2017-09-20, modified 2025-07-10), opening. Source (opens in a new tab), saved October 28, 2026.

  • Hardness, highest: up to 50 ppm

    “Water hardness cannot exceed 50ppm, otherwise a water softener is needed”

    Installation Requirements, Slayer Steam Single (cut sheet, MAR 2026), Slayer support knowledge base 'Installation Cut Sheets - 2026', Water section (mains connection). Source (opens in a new tab), saved October 28, 2026.

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