The Kohler Birthday Bath K-100-0 is a 72-by-37.5-inch freestanding bathtub with a classic oval silhouette sized for large, statement-making primary bathrooms. Its enameled cast-iron construction gives it the substantial feel and heat retention associated with Kohler's heritage freestanding tubs. The center-drain layout supports a balanced soaking position from either end.
What material is the Birthday Bath made from, and how heavy should I expect it to be?
This model is treated here as a cast-iron freestanding tub, which is consistent with the Birthday Bath's classic Kohler freestanding positioning. Cast iron is much heavier than acrylic and gives the tub a very rigid, stable feel once installed. That weight also helps with heat retention during longer soaks. Buyers should plan on a substantially heavier unit than a typical acrylic freestanding bath and confirm floor support before delivery.
What does installation require for this freestanding tub?
The K-100-0 uses a freestanding installation, so the floor structure, finished flooring, and rough plumbing all need to be coordinated before the tub is set. Because it is a heavy cast-iron model, installers should verify access paths, floor loading, and the final drain placement in advance. This type of tub is usually installed after most finish work is complete to avoid damaging the enamel. Kohler drain and overflow hardware are typically selected separately for the final setup.
What drain and faucet setup works with this bathtub?
This tub uses a center drain and has no faucet holes drilled into the rim. That means it is intended for a floor-mounted filler, a wall-mounted tub filler, or another separately planned freestanding-compatible faucet solution. The drain assembly is not included, and the overflow hardware is also listed as separate. Matching the waste-and-overflow kit to the tub and verifying trim compatibility before install is the safe approach.
How much space should I allow around the 72 x 37.5 inch footprint?
The tub body is 72 inches long and 37.5 inches wide, so it is best suited to larger bathrooms where the freestanding form can be approached comfortably from more than one side. In practice, buyers usually want walking clearance around the tub rather than fitting it wall to wall like an alcove model. Room planning also needs to account for faucet placement and the visual mass of a cast-iron tub of this size. It works best as a centerpiece rather than a tight-space solution.
How should the Birthday Bath be cleaned and maintained?
Routine care should focus on mild soap, a soft cloth, and non-abrasive bathroom cleaners that will not scratch the enamel finish. Abrasive pads, gritty powders, and harsh chemicals should be avoided because they can dull or damage the surface over time. Rinsing after use helps reduce soap residue, and occasional drying can limit mineral spotting in hard-water areas. Because freestanding tubs expose more exterior surface, it is worth cleaning the outside shell along with the basin.
# Kohler Birthday Bath 72 x 37.5 Freestanding Bathtub **Model:** `K-100-0` **Brand:** Kohler **Category:** Bathtub > The Kohler Birthday Bath K-100-0 is a 72-by-37.5-inch freestanding bathtub with a classic oval silhouette sized for large, statement-making primary bathrooms. Its enameled cast-iron construction gives it the substantial feel and heat retention associated with Kohler's heritage freestanding tubs. The center-drain layout supports a balanced soaking position from either end. ## Specifications | Attribute | Value | |---|---| | Bathtub Type | freestanding | | Material | cast-iron | | Dimensions Lxwxh In | 72 x 37.5 x null | | Drain Location | center | | Drain Included | No | | Overflow Included | No | | Faucet Holes | 0 | | Color Finish | White | | Warranty | 1-year limited | ## What's Included - Freestanding tub only Source: https://www.jaspecs.com/kohler/bathtub/k-100-0-kohler-birthday-bath-freestanding-bathtub/