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Deal.ai › Kohler › Built-In Bathtubs
Kohler
Kohler Underscore (K-1821-0)

Kohler Underscore (K-1821-0)

Best price now

$1,558.42at Lowe'sChecked 10 h ago

Compared across 3 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.

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Price facts

  • Lowest price today: $1,558.42 at Lowe's (checked Nov 10, 2026).
  • Checked at 3 stores.
  • Our take on the Kohler Underscore (K-1821-0)

    The Underscore K-1821-0 is a 66 x 32 inch rectangular acrylic soaking tub designed for alcove installation against a wall. It holds about 86 gallons to the overflow and has an 18-inch water depth, so it soaks deeper than many standard alcove tubs of the same footprint. Kohler's acrylic keeps the tub light at 86 pounds and warm to the touch, and the integrated overflow helps prevent spills. It suits bathroom remodels where a standard 60-inch alcove is being replaced with a longer, deeper soaker.

    Best forAlcove remodels with a 66-inch openingSoakers who want more depth than a standard tubLightweight installs where a cast iron tub is impracticalHouseholds wanting a simple white acrylic tub
    Pros
    • 18-inch depth gives a real soaking experience
    • Acrylic is light and easy to maneuver during install
    • Integrated overflow protection
    • Rectangular shape fits standard alcove layouts
    • Warm-to-the-touch acrylic surface
    Cons
    • No faucet or fixtures included
    • Acrylic can scratch and dull over time
    • Needs a 66-inch alcove, longer than the common 60-inch tub
    • Plain white finish offers little design flair

    Kohler Underscore (K-1821-0) prices at every store

    • The Bold Look of KohlerNew

      In stock

      $1,558.42Checked 10 h ago
      Visit The Bold Look of Kohler
    • Lowe'sNew

      In stock

      $1,558.42Free shippingChecked 10 h ago
      Visit Lowe's
    • HomeryNew

      Out of stock

      $1,558.43Free shippingChecked 10 h ago
      Visit Homery

    Store links may earn us a commission. Some prices via Klarna.

    Kohler Underscore (K-1821-0) price history

    Lowest price we've seen: $1,558.42 on Nov 10 at The Bold Look of Kohler. Tracked across 3 stores since Nov 10.

    What reviewers say

    Owners generally like the depth and the clean rectangular look, and many mention how much easier the acrylic tub is to handle than cast iron. Some report scratching and a hollow feel underfoot compared with heavier tubs.

    What people mention
    • DepthPraisedOwners say the 18-inch water depth lets them soak up to the shoulders.
    • WeightPraisedBuyers note the acrylic tub is light enough for two people to set in place.
    • BuildMixedSome say the acrylic flexes or sounds hollow underfoot compared with cast iron.
    • DurabilityCriticisedA few owners report scratches and dulling on the surface over time.
    • FitMixedThe 66-inch length is praised for roominess but complicates replacing a 60-inch tub.

    Specifications

    Shape
    RectangularSource
    Color
    WhiteSource
    Material
    AcrylicSource
    Number of People (ppl.)
    1Source
    Width (")

    Questions and answers

    Does the Kohler Underscore K-1821-0 include a faucet?
    No. It is a bare tub, so you supply the faucet, drain and trim separately.
    What size alcove does it need?
    It is 66 inches long and 32 inches wide, so it needs a rough opening at least that size. Most standard tubs are 60 inches, so measure before replacing one.
    How much water does it hold?
    About 86 gallons to the overflow, with an 18-inch water depth. That is deeper than most standard alcove tubs.
    Is acrylic a good material for a bathtub?
    Acrylic is light, warm to the touch and holds heat well, but it scratches more easily than cast iron or enameled steel.
    Can it be installed as a freestanding tub?
    No. It is designed as a wall-alcove tub and needs surrounding walls or a framed enclosure.
    Does it have an overflow?
    Yes, it has integrated overfill protection built into the tub.
    Where is the Kohler Underscore (K-1821-0) cheapest?
    At Lowe's, for $1,558.42, as of our latest check.
    Where can I buy the Kohler Underscore (K-1821-0)?
    3 stores we checked sell it, including The Bold Look of Kohler, Lowe's, Homery.

    Stores we've priced the Kohler Underscore (K-1821-0) at

    • Homery deals and prices
    • Lowe's deals and prices

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    32.0Source
    Placement
    WallSource
    Volume (gal)
    85.8Source
    Faucet
    NoSource
    Height (")
    22.0Source
    Bathtub Depth (")
    18.0Source
    Features
    Overfill Protection, Soaking TubSource
    Weight (lb)
    86.0Source
    Length (")
    66.0Source