A black drop-in bathtub can make a bathroom feel more tailored, but the right choice depends on more than color. Measure your opening, check the drain location, and compare the tub’s soaking features with your comfort needs. These four options range from a compact 54-inch model to a spacious 72-inch bath, with different drain, support, and heating features to consider.
Availability note: The supplied product data lists all four tubs as unavailable. Check the linked listing for current availability and confirm which drain and installation parts are included before you buy.
Table of Contents
Quick Comparison
| Product | Size | Standout features | Best suited to |
|---|---|---|---|
| Swiss Madison Lausanne Matte Black Drop-In Bathtub | 54″ x 30″ | 13-inch soaking depth; reversible drain; matte-black finish | Smaller layouts and flexible drain placement |
| KOHLER Underscore Drop-In Bath | 60″ x 36″ | Molded lumbar support; slotted overflow | Bathing comfort and a clean, modern look |
| KOHLER Drop-In Bath with Bask Heated Surface | 60″ x 30″ | Heated surface; reversible drain; textured bottom | Those who want added warmth and a lower step-over height |
| KOHLER 72-Inch Underscore Drop-In Bath | 72″ x 36″ | Center drain; slotted overflow; molded lumbar support | Large bathrooms and longer bathing space |
Our Picks: Best Black Drop In Bathtub reviews
Swiss Madison Lausanne: A Compact Matte-Black Tub with a Reversible Drain
The Swiss Madison Lausanne is the smallest tub in this group at 54 by 30 inches. Its matte-black finish gives it a distinct look, while the drop-in design is made to sit within a surrounding deck or frame. The listed 13-inch soaking depth gives you a useful reference point when comparing it with other tubs.
Its reversible drain is a practical feature if your bathroom layout can accommodate either a left- or right-hand drain position. The tub is made from fiberglass-reinforced acrylic. Still, the product details do not specify the drain parts included, so check that before ordering and confirm the tub will fit your planned opening.
This is the most space-conscious option here, but its shorter length may feel limiting if you want a more expansive bath. The Kohler models offer larger footprints or additional comfort features, while the Lausanne focuses on compact dimensions and drain flexibility.
Pros:
- Compact 54-by-30-inch footprint
- Reversible drain allows left- or right-hand installation
- Matte-black finish and fiberglass-reinforced acrylic construction
Cons:
- Shorter than the other tubs in this comparison
- Drain inclusion and compatibility should be confirmed before purchase
Verdict: Choose the Lausanne if you need a smaller black drop-in tub and want flexibility in drain placement.
KOHLER Underscore: A Roomier Tub with Molded Lumbar Support
This 60-by-36-inch KOHLER Underscore is wider than the Lausanne and the heated KOHLER option. Its simple lines suit a range of bathroom styles, and its molded lumbar support adds a shaped backrest for bathing comfort. The tub is made from acrylic and uses a slotted overflow design intended to allow deeper soaking.
The listed drain requirement is specific: it calls for a KOHLER K-7271 or K-7272 Clearflo slotted overflow bath drain, sold separately. Plan for that additional component and check its fit with your plumbing setup. The larger width also means you should measure the tub deck and surrounding space carefully before committing.
Compared with the 72-inch Underscore, this model takes up less length while keeping a generous 36-inch width. It does not list a heated surface, so the Bask model is the better match if built-in warmth is a priority.
Pros:
- 60-by-36-inch size offers a wider bathing area
- Molded lumbar support adds a shaped backrest
- Slotted overflow design is intended for deeper soaking
Cons:
- Required Clearflo drain is sold separately
- Its 36-inch width may not suit a tight bathroom layout
Verdict: Consider this Underscore if you have room for a wide tub and value lumbar support, but account for the separately sold drain.
KOHLER Bask: A Heated Bath with a Lower Step-Over Height
This 60-by-30-inch KOHLER drop-in bath stands out for its Bask heated surface, designed to warm the back and neck area. It also has molded lumbar support and a textured bottom surface. The reversible drain provides left- or right-hand drain flexibility, which can help when the plumbing layout limits your options.
The product details describe a 19-inch step-over height while retaining the depth of a standard 21-inch bath. That combination may appeal if you want a lower entry than a taller tub, though you should confirm the exact installation dimensions and access needs for your bathroom. The tub is made with KOHLER ExoCrylic, which the supplied specifications describe as 30% lighter than KOHLER acrylic FRP.
The heated surface is its defining advantage, but it adds a feature to consider during planning. Check the listing and installation information for the electrical requirements and required components. Unlike the 60-by-36-inch Underscore, this model is narrower and emphasizes warmth rather than a wider bathing area.
Pros:
- Bask heated surface warms the back and neck area
- Reversible drain supports left- or right-hand layouts
- Textured bottom and molded lumbar support
- Listed 19-inch step-over height with standard-bath depth
Cons:
- Heating feature requires extra installation planning
- At 30 inches wide, it is narrower than the 60-by-36-inch Underscore
Verdict: Pick the Bask model if a heated surface is a priority and you can plan for its installation needs.
KOHLER 72-Inch Underscore: A Long Center-Drain Tub for Larger Bathrooms
At 72 by 36 inches, this KOHLER Underscore is the largest tub in the group. Its center drain distinguishes it from the models with reversible drain placement, so it is important to make sure your plumbing and tub deck are designed for that position. The acrylic construction and clean lines give it a straightforward, contemporary profile.
The molded lumbar support provides a shaped backrest, and the slotted overflow is designed to allow deeper soaking. As with the 60-by-36-inch Underscore, the specified K-7271 or K-7272 Clearflo slotted overflow bath drain is sold separately. The longer footprint can offer more room, but it also calls for more floor and deck space.
This model makes the most sense when your bathroom can comfortably accommodate its size and center-drain layout. If space is limited or the plumbing location is fixed off-center, the smaller Lausanne or reversible-drain Bask may be easier to plan around.
Pros:
- Largest listed footprint at 72 by 36 inches
- Center drain can suit a matching plumbing layout
- Molded lumbar support and slotted overflow
Cons:
- Requires substantial bathroom and deck space
- Specified Clearflo drain is sold separately
Verdict: Choose the 72-inch Underscore for a spacious bathroom with plumbing suited to a center drain.
How to Choose a Black Drop-In Bathtub
Measure the opening, deck, and access route
Start with the tub’s listed length and width, then measure the framed opening and the deck that will surround it. Check the route into the bathroom too, including doorways and turns. The models here range from 54 to 72 inches long, and the wider KOHLER options need more room than the 30-inch-wide tubs. Confirm the installation specifications before finalizing the framing.
Match the drain position to your plumbing
Drain location can affect how much plumbing work a replacement or remodel needs. The Lausanne and Bask models have reversible drains, while the 72-inch Underscore has a center drain. The 60-by-36-inch Underscore requires a specified slotted overflow bath drain sold separately. Verify the drain position, overflow style, and required parts for your exact setup before ordering.
Compare soaking and support features
Look beyond the outside dimensions. The Lausanne lists a 13-inch soaking depth. The two Underscore models include molded lumbar support and a slotted overflow, while the Bask adds lumbar support and a heated surface. Consider whether you want a shaped backrest, extra warmth, or a particular soaking depth, and check complete specifications for any measurement that is important to you.
Choose a material and finish you can maintain
The Lausanne is described as fiberglass-reinforced acrylic; the two Underscore models use acrylic; and the Bask uses KOHLER ExoCrylic. Black finishes can make water marks, soap residue, and dust more noticeable, so check the manufacturer’s care instructions before choosing a cleaning routine. Avoid assuming that a finish or material can tolerate every household cleaner.
Plan for installation parts and electrical needs
Drop-in tubs sit within a surrounding deck or enclosure, so your project needs suitable support and a correctly sized opening. The supplied details state that the Underscore drains are sold separately. For the heated Bask, review the manufacturer’s installation information for electrical requirements and any additional components. Ask a qualified installer to confirm the site conditions, drain fit, and installation plan.
Set a realistic space and comfort priority
If space is tight, the 54-inch Lausanne is the shortest option in this comparison. If you want added warmth, the Bask is the only model listed with a heated surface. For a wider tub, consider the 60-by-36-inch Underscore; for the longest footprint, consider the 72-by-36-inch model. Choose based on your room and plumbing first, then weigh comfort features.
Frequently Asked Questions
What does drop-in bathtub mean?
A drop-in tub is installed within a surrounding deck or framed enclosure, with the rim resting on the finished surface. The deck and opening need to match the tub’s installation requirements.
Which of these tubs has a reversible drain?
The Swiss Madison Lausanne and the KOHLER Bask model are listed with reversible drains. The 72-inch KOHLER Underscore has a center drain. Check the exact product specifications before planning plumbing work.
Are the drains included with these tubs?
The 60-by-36-inch and 72-by-36-inch KOHLER Underscore listings specify a Clearflo slotted overflow drain sold separately. The supplied details do not confirm whether a drain is included with the Lausanne or Bask, so verify that with the seller.
Which option is the smallest?
The Swiss Madison Lausanne is the smallest listed at 54 by 30 inches. Measure your space and confirm the installation dimensions before choosing it for a compact bathroom.
Which tub has a heated surface?
The KOHLER Bask model is the only option here described with a heated surface. Review its installation information to understand the electrical requirements and any components needed.
Is the textured bottom on the Bask slip-proof?
The supplied product details describe a textured bottom but do not claim that it is slip-proof. Treat the texture as a listed surface feature, and follow the manufacturer’s safety and care guidance.
Are these tubs currently available?
The supplied product data lists all four models as unavailable. Availability can change, so check the linked product pages before making plans or placing an order.
Final Recommendation
The best choice depends on your room and installation needs. The Swiss Madison Lausanne is the most compact option and offers a reversible drain. The KOHLER Bask stands out for its heated surface, while the 60-by-36-inch Underscore balances a wider footprint with molded lumbar support. If you have ample space and center-drain plumbing, the 72-inch Underscore is the largest choice. Before you decide, confirm availability, measurements, drain parts, and installation requirements for the exact model.
