6 Best Alternatives to the Kohler 1136-7 Underscore® 66" x (2026)
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The Kohler 1136-7 Underscore offers a bold black drop-in design with a 24.8-inch height for deep soaking. If you are searching for kohler 1136 7 underscore 66 x alternatives, you might need a different size or installation type. This original model measures 68.9 inches long and fits standard alcove setups. Some buyers prefer freestanding styles or wider footprints for better comfort. Others may want jetted features or accessible entry options that this simple drop-in tub does not provide.
The alternatives listed here share key specifications with the original Kohler tub. We selected these models because their dimensions and types overlap with your needs. You can find longer soaking tubs, heated options, or walk-in designs that suit different bathroom layouts. Each choice maintains relevant specs like length or material while offering distinct features. This list helps you compare practical details without guessing. Focus on the measurements and installation requirements to find the right fit for your space.
Our top pick: Kohler Underscore 66" Black Drop-In Tub.
How alternatives compare to Kohler
Kohler Underscore 72-Inch Drop-in
The Kohler Underscore 72-inch model extends the footprint to 74.4 inches long and 44.4 inches wide. It offers a slightly deeper 25.3-inch height compared to the 24.8-inch original. This larger size requires more bathroom space but provides greater soaking volume. The black finish matches the original aesthetic. You should choose this if you have a spacious bathroom and want deeper immersion without changing the brand style. It sacrifices floor space efficiency for increased capacity.
WOODBRIDGE 72" Heated Soaking Tub
This WOODBRIDGE tub shifts to a freestanding style with a 72-inch length and 29.1-inch height. It includes heated air and water jets for hydro-massage, a feature the original lacks. The unit weighs 142 pounds, requiring a sturdy floor. You get a luxury soaking experience with temperature control. However, it does not fit alcove installations. Pick this if you want massage features and have the structural support for a heavier, standalone tub in a larger bathroom.
WOODBRIDGE 72 Inch Heated Soaking Tub
The WOODBRIDGE BJ-600 is another 72-inch freestanding tub with a heater. It stands 22.9 inches high, which is lower than the original Kohler. It combines air and water jets for deep soaking relief. At 137 pounds, it needs significant floor support. This model offers heated massage capabilities absent in the drop-in original. Choose this alternative if you prioritize hydrotherapy and heated water in a standalone design, accepting a lower rim height than the Kohler Underscore.
GarveeLife 66" Freestanding Acrylic Tub
The GarveeLife 66-inch tub is freestanding and made of acrylic. It measures 29.5 inches wide, significantly narrower than the original 39-inch width. The 23-inch height is slightly lower than the Kohler. This compact width suits open floor plans better. It lacks the deep soaking volume of the original. Select this if you need a standalone tub that fits narrower spaces. It offers a clean white finish and easier installation in open layouts compared to the alcove-mounted original.
Empava 71" Back-to-Wall Whirlpool Tub
The Empava 71-inch tub is a whirlpool model with a 33.7-inch width. It weighs 265 pounds, much heavier than the original. It features dual circuits for jet operation and temperature maintenance. The 23.8-inch height is comparable to the Kohler. This tub provides extensive hydrotherapy features. You must have the electrical infrastructure for the jets. Pick this if you want jetted water therapy and warm water retention in a standard footprint, rather than simple soaking.
FerdY Floridian 55" Walk-In Tub
The FerdY Floridian 55-inch walk-in tub is designed for accessibility. It measures 55 inches long and 33 inches high. The acrylic material is durable and retains heat well. It features quick drainage for safety. This model sacrifices deep soaking volume for easier entry and exit. Choose this if you need a walk-in door for mobility reasons. It offers a compact footprint and thermal retention, differing significantly from the deep, alcove-style original in both function and installation type.
Quick picks
Our 7 picks
Kohler Underscore 66" Black Drop-In Tub
Best for: Deep soaking in a modern black finish
- Type
- drop-in
- Length
- 68.9 inches
- Mount Type
- drop-in
- Color
- Black
- Dimensions
- 68.9 × 39 × 24.8 inches
This Kohler Underscore model is a black drop-in bathtub designed for standard alcove installations. It measures 68.9 inches in length and 39 inches in width, with a depth of 24.8 inches. The tub offers a sleek, modern aesthetic with its solid black finish. You will find four color options available, including white and biscuit, if black does not suit your space. It fits well into bathrooms needing a durable, straightforward soaking solution.
Pros
- 68.9-inch length provides ample soaking space
- 39-inch width offers comfortable shoulder room
- 24.8-inch depth allows for deep immersion
- Available in Black, Biscuit, White, and Dune colors
Cons
- Limited to drop-in installation only
- No integrated jet or massage features
- Requires custom deck or surround for installation
Good fit if
- You want a durable, no-frills soaking tub
- You prefer a black finish for contrast
- You have space for a 69-inch long tub
Skip if
- You need a freestanding or alcove tub with jets
- You require a smaller footprint under 60 inches
- You prefer white or neutral tones only
Verdict: Kohler Underscore 66" Black Drop-in Tub suits those seeking a deep, durable soak in a modern black finish. It fits best in bathrooms where a standard drop-in installation is planned and a bold color accent is desired.
Kohler Underscore 72-Inch Drop-in
Best for: Large bathrooms needing deep soaking and dark style
- Type
- drop-in
- Length
- 74.4 inches
- Color
- Black
- Dimensions
- 74.4 × 44.4 × 25.3 inches
- Weight
- 110 pounds
This Kohler Underscore model is a black drop-in bathtub designed for larger bathrooms. It measures 74.4 inches in length and 44.4 inches in width, offering a spacious footprint compared to standard 66-inch tubs. The unit weighs 110 pounds and stands 25.3 inches tall. It suits you if you need a deep soaking experience and a modern, dark aesthetic that contrasts with typical white fixtures.
Pros
- Generous 74.4-inch length provides extra legroom
- Wide 44.4-inch width allows for comfortable movement
- Black finish offers a distinct modern look
- Drop-in design integrates easily into custom decks
Cons
- Significantly larger footprint may not fit smaller bathrooms
- Heavy 110-pound weight requires reinforced subflooring
- Limited to alcove or drop-in installation only
Good fit if
- You have a spacious bathroom capable of holding a 74-inch fixture
- You prefer a deep, wide soaking experience
- You want a black bathtub to match dark tile or decor
Skip if
- You are limited to a standard 60-inch or 66-inch alcove space
- You need a freestanding tub for a central room placement
- You cannot support the additional weight of a 110-pound unit
Verdict: Kohler Underscore 72" Black Drop-in Tub is ideal for large bathrooms where its extended length and width can be fully utilized. It fits you if you prioritize deep soaking capacity and a bold, dark design over space efficiency.
WOODBRIDGE 72" Heated Soaking Tub
Best for: deep soaking with heated air and water jets
- Type
- Double slipper whirlpool & air
- Material
- LUCITE acrylic
- Length
- 72 inches
- Water Capacity
- 65 Gallons
- Soaking Depth
- 14-1/2"
- Mount Type
- Freestanding
This freestanding acrylic tub measures 72 inches long and holds 65 gallons of water. It combines whirlpool and air bubble jets for a full hydro-massage experience. An inline heater keeps water warm during longer soaks. The seating area offers 41-3/4 inches of length. You get 6 body jets and 10 air jets for targeted relief. It requires a dedicated 30-amp breaker for the high-performance pump.
Pros
- Combines whirlpool and air bubble jets in one unit
- Includes an inline heater for extended soaking comfort
- 65-gallon water capacity with 14-1/2 inch soaking depth
- Stainless steel sanitary jets with chromotherapy lighting
Cons
- Requires a dedicated 110-120V 30-amp electrical breaker
- Heavier build at 142 pounds compared to standard soaking tubs
- Limited to 6 body jets and 10 air jets
Good fit if
- You want a deep soak with both water and air massage
- You have the electrical capacity for a 30-amp circuit
- You prefer a large 72-inch freestanding design
Skip if
- You only have a standard 15-amp or 20-amp outlet
- You prefer a smaller 66-inch footprint for tight spaces
- You want a simple soaking tub without jets
Verdict: WOODBRIDGE 72" Whirlpool & Air Soaking Tub suits those seeking a luxurious, heated hydro-massage experience in a spacious freestanding design, provided you can support the electrical and weight requirements.
WOODBRIDGE 72 Inch Heated Soaking Tub
Best for: Deep soaking with combined air and water jets
- Type
- Whirlpool & Air, Soaking
- Material
- LUCITE acrylic
- Length
- 72 inches
- Water Capacity
- 74 Gallons
- Soaking Depth
- 13-3/4"
- Mount Type
- Freestanding
This freestanding acrylic tub offers 74 gallons of capacity and a 13-3/4 inch soaking depth. It combines 10 whirlpool jets with 6 air bubble jets for hydro massage. An inline heater maintains water temperature during longer soaks. The unit requires a dedicated 30-amp breaker. It is a spacious option for those who want both water and air massage features in a single freestanding design.
Pros
- 74-gallon water capacity for deep soaking
- Inline heater maintains water temperature
- Combines 10 whirlpool and 6 air jets
- 3-speed adjustable air massage intensity
Cons
- Requires a dedicated 30-amp electrical breaker
- Heavy 137-pound build limits placement options
- No remote control listed in specifications
Good fit if
- You need a large 72-inch freestanding tub
- You want both air and water massage jets
- You have the electrical capacity for a 30-amp circuit
Skip if
- You only have a standard 15-amp outlet available
- You prefer a compact soaking tub under 60 inches
- You want a tub without massage jets
Verdict: WOODBRIDGE 72" Heated Whirlpool & Air Tub fits bathrooms where you can support its weight and power needs while enjoying deep, heated hydro massage.
GarveeLife 66" Freestanding Acrylic Tub
Best for: open floor plans and standalone installation
- Type
- freestanding
- Material
- acrylic
- Length
- 66.1 inches
- Mount Type
- freestanding
- Dimensions
- 66.1 × 29.5 × 23 inches
- Weight
- 121 pounds
This GarveeLife soaking tub measures 66.1 inches long and 29.5 inches wide. It features a 23-inch height and weighs 121 pounds. The acrylic shell includes fiberglass reinforcement for durability. A textured floor provides certified non-slip safety. It comes with a polished chrome pop-up drain and overflow. This freestanding unit suits bathrooms needing a standalone centerpiece.
Pros
- 66.1-inch length allows full body stretching
- CUPC-certified non-slip surface for safety
- Fiberglass-reinforced acrylic retains heat longer
- Includes polished chrome pop-up drain
Cons
- 29.5-inch width is narrower than standard alcove tubs
- 23-inch height limits deep soaking depth
- 121-pound weight requires sturdy floor support
Good fit if
- You want a standalone tub for open floor plans
- You need a non-slip surface for safety
- You prefer acrylic that resists stains easily
Skip if
- You require a deep soaking depth over 23 inches
- You need a wider tub for extra comfort
- You prefer a drop-in installation style
Verdict: GarveeLife 66" Freestanding Acrylic Tub fits bathrooms with open layouts where a standalone design is preferred over alcove models. Its narrower width and moderate depth make it a practical choice for standard soaking needs.
Empava 71" Back-to-Wall Whirlpool Tub
Best for: deep soaking with temperature maintenance
- Type
- Back-to-wall, whirlpool
- Material
- Acrylic
- Length
- 70.9 in
- Water Capacity
- 67 gal
- Soaking Depth
- 13.6 in
- Mount Type
- Back-to-wall
The Empava 71" Jetted Bathtub offers 67 gallons of capacity in a 70.9" x 33.7" back-to-wall design. It features 10 water jets and 10 air jets for hydrotherapy. An inline heater maintains water temperature up to 104°F. The acrylic tub includes chrome fixtures and LED lighting. It requires two dedicated 15A GFCI circuits for installation.
Pros
- 67-gallon water capacity for deep soaking
- Inline heater maintains water warmth up to 104°F
- 20-jet system with 10 water and 10 air jets
- Includes tub-mounted faucet and handheld shower
Cons
- Requires two separate 110/120V, 15A dedicated GFCI circuits
- Must fill water 1–2 inches above jets before starting
- Functions automatically shut off after 60 minutes
Good fit if
- You want dual hydrotherapy with air and water jets
- You need a back-to-wall tub for a master bath
- You prefer an inline heater for longer soaks
Skip if
- You cannot install two dedicated 15A electrical circuits
- You prefer a freestanding tub over a back-to-wall design
- You need a tub that heats cold water rapidly
Verdict: Empava 71" Jetted Bathtub suits those who want extensive hydrotherapy features and warm water retention in a standard footprint. It fits bathrooms with the necessary electrical infrastructure for dual circuits.
FerdY Floridian 55" Walk-In Tub
Best for: Accessible bathing with quick drainage
- Type
- Walk-in, soaking
- Material
- Acrylic
- Length
- 55 inches
- Color
- White
- Dimensions
- 55 × 40 × 33 inches
- Weight
- 152 pounds
The FerdY Floridian is a 55-inch by 33-inch walk-in tub made from Lucite Grade Acrylic. It features a low 4-inch step-in threshold and a left-side door for easy access. The tub fills in about 3 minutes and drains in under 2 minutes. It offers strong insulation, losing only 1 degree of water temperature after 45 minutes at 77 degrees Fahrenheit. This white acrylic tub weighs 152 pounds and is designed for seniors or those needing accessible bathing.
Pros
- Low 4-inch step-in threshold for easy entry
- Fills in approximately 3 minutes at 60 psi
- Drains in less than 2 minutes
- Lucite Grade Acrylic construction resists yellowing for 10 years
- Strong insulation maintains water temperature
Cons
- Smaller 55-inch length compared to standard soaking tubs
- No motorized heater included in the design
- Limited to white color option in this variation
Good fit if
- You need a low step-in height for safety
- You want quick fill and drain times
- You prefer a smaller footprint for accessibility
Skip if
- You require a heated water system built-in
- You need a 66-inch or longer soaking tub
- You prefer a freestanding design over a walk-in
Verdict: FerdY Floridian 55" Walk-in Tub is a practical accessible option for users prioritizing entry ease and thermal retention over deep soaking volume. It suits those who value rapid drainage and durable acrylic surfaces in a compact footprint.
Specifications side by side
| Spec | Kohler Underscore 66" Black Drop-In Tub | Kohler Underscore 72-Inch Drop-in | WOODBRIDGE 72" Heated Soaking Tub | WOODBRIDGE 72 Inch Heated Soaking Tub | GarveeLife 66" Freestanding Acrylic Tub | Empava 71" Back-to-Wall Whirlpool Tub | FerdY Floridian 55" Walk-In Tub |
|---|---|---|---|---|---|---|---|
| Type | drop-in | drop-in | Double slipper whirlpool & air | Whirlpool & Air, Soaking | freestanding | Back-to-wall, whirlpool | Walk-in, soaking |
| Material | not specified | not specified | LUCITE acrylic | LUCITE acrylic | acrylic | Acrylic | Acrylic |
| Length | 68.9 inches | 74.4 inches | 72 inches | 72 inches | 66.1 inches | 70.9 in | 55 inches |
| Water Capacity | not specified | not specified | 65 Gallons | 74 Gallons | not specified | 67 gal | not specified |
| Soaking Depth | not specified | not specified | 14-1/2" | 13-3/4" | not specified | 13.6 in | not specified |
| Mount Type | drop-in | not specified | Freestanding | Freestanding | freestanding | Back-to-wall | not specified |
| Jet Type | not specified | not specified | Whirlpool and air bubble | Whirlpool and air bubble | not specified | Whirlpool, air bubble | not specified |
| Color | Black | Black | Chrome Drain | With Heater | Harmony Gloss White | White | White |
| Dimensions | 68.9 × 39 × 24.8 inches | 74.4 × 44.4 × 25.3 inches | 72 × 35.4 × 29.1 inches | 72 × 35.4 × 22.9 inches | 66.1 × 29.5 × 23 inches | 70.9 × 33.7 × 23.8 inches | 55 × 40 × 33 inches |
| Weight | not specified | 110 pounds | 142 pounds | 137 pounds | 121 pounds | 265 pounds | 152 pounds |
| Model | K-1136-7 | K-1137-7 | BJ- 400 | BJ-600 | ZRZOWE9j | EMPV-71JT351 | not specified |
| Size | not specified | not specified | 72 Inch | 72 Inch | 66 inch | not specified | 55" x 33" |
If you also compare sewing hardware, you can evaluate brother se2000 5 x 7 alternatives by stated dimensions.
Frequently asked questions
Can I install a freestanding tub in place of the Kohler Underscore?
Yes, you can replace the drop-in model with a freestanding option. The GarveeLife 66-inch tub is a direct size match at 66.1 inches long and 29.5 inches wide. It sits on the floor rather than being built into a deck. This works well for open layouts where you want a standalone piece.
What is the largest black tub available as an alternative?
The Kohler Underscore 72-inch Drop-in is the largest black option. It measures 74.4 inches long and 44.4 inches wide. This model weighs 110 pounds. It provides more soaking volume than the 66-inch original. It is best for larger bathrooms where you do not need to save space.
Do these alternatives offer heated water or massage features?
Some alternatives include massage systems. The WOODBRIDGE BJ-400 and BJ-600 models feature both air and water jets. The Empava 71-inch tub also includes a whirlpool system. These features require electrical infrastructure. They are not available in the standard Kohler Underscore black drop-in models.
Is there a walk-in tub option for easier access?
Yes, the FerdY Floridian 55-inch Walk-In Tub is designed for accessibility. It has a compact footprint of 55 inches long and 40 inches wide. This model prioritizes entry ease and thermal retention. It is suitable if you need a door for safer entry rather than deep soaking volume.
How do the dimensions of the WOODBRIDGE tubs compare to the Kohler?
The WOODBRIDGE tubs are 72 inches long, which is longer than the 68.9-inch Kohler. The BJ-400 model is 35.4 inches wide and 29.1 inches high. The BJ-600 is also 35.4 inches wide but only 22.9 inches high. Both are heavier, weighing around 140 pounds.
Which alternative is best for a small bathroom space?
The FerdY Floridian 55-inch Walk-In Tub is the most compact. It measures 55 inches long and 40 inches wide. The GarveeLife 66-inch freestanding tub is also narrower at 29.5 inches wide. These options fit better in smaller areas than the 72-inch or wide 44-inch Kohler models.
What material are the freestanding and walk-in alternatives made of?
The GarveeLife and FerdY tubs are constructed from acrylic. The GarveeLife is a gloss white finish. The FerdY is also white. The Kohler alternatives are typically acrylic as well, though the black models may have a different surface treatment. Acrylic provides durability and heat retention for soaking.