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A separate waterway, and a filter you keep buying

The best 3-way filter kitchen taps for 2026

A three-way tap sends hot, cold and filtered water through the same body, and the honest question is how separate the third waterway really is. A true tri-flow keeps the filtered line in its own tube all the way to its own outlet, so it never touches the mixed water; a cheaper design merges them below the spout. Makers who build the first kind say so, and it is the single line worth looking for. The second question is the one that costs money for years: which cartridge it takes. A tap tied to one maker's proprietary filter is a subscription; one that takes a common fitting is not. Note also what the maker claims the filter reduces — chlorine taste, particles, limescale — and take it as a declared claim, not a health benefit. We compare whether the filtered waterway is separate, filter fitting and stated capacity in litres, tap hole diameter, spout height and reach, and cartridge diameter.

The models we recommend

  1. Ibergrif three-way kitchen mixer with filtered outlet, two levers

    Three-way kitchen mixer · three separate internal lines · own lever for filtered water · 304 stainless · cold-start lever

    A two-lever three-way tap that states what actually distinguishes this family: three separate internal waterways, so filtered water never shares a channel with the mixed side.

    Best for: Replacing an existing single-hole kitchen tap with one that also serves an under-sink filter, without cutting the worktop.

    ≈ £58 / 53 €

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  2. Sofetiy three-way kitchen mixer, 320 mm outlet height, 280 mm spout

    Three-way kitchen mixer · 320 mm outlet height · 280 mm spout · G3/8 and G1/4 filter connections · hole 35–38 mm · brass core on the filtered side

    The best-dimensioned kitchen tap in this catalogue: an outlet height, a spout length, two filter thread sizes, a deck bore range and a worktop limit, all published.

    Best for: A large single or double sink where filtered water is wanted and the tap has to be checked against the worktop before anything is drilled.

    ≈ £73 / 58 €

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  3. GRIFEMA three-way brass kitchen mixer with three 50 cm DVGW hoses

    Three-way kitchen mixer · brass body · three DVGW 50 cm hoses · 3/8 in and 1/4 in filter connections · double lever

    A brass three-way mixer that arrives with all three hoses certified and both filter threads in the box — the least ambiguous first installation in this hub.

    Best for: A first three-way installation, where knowing that every hose and thread in the box is right matters more than the tap's dimensions.

    ≈ £63 / 62 €

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Prices quoted in these summaries are dated readings. The live price is shown next to each product.