6 Best Alternatives to the Kohler 1137-7 Underscore® 72" x (2026)
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
If you are searching for kohler 1137 7 underscore 72 x alternatives, you likely value the Kohler Underscore’s minimalist drop-in design and durable construction. This tub measures 74.4 inches in length with a width of 44.4 inches and weighs 110 pounds. It offers a clean aesthetic without hydrotherapy features, making it ideal for simple, elegant bathrooms. However, you might want more depth, heated water, or dual-person capacity. The Kohler model lacks jets and heating elements, which limits its relaxation options for some users.
The 6 alternatives listed here were chosen because their specifications overlap with the original product’s footprint. Most options also measure 72 inches in length, ensuring they fit similar alcoves. You can find deeper soaking depths, such as the 29.1-inch height on the WOODBRIDGE models, or wider seating areas like the 48-inch width on the Empava tub. These selections provide active hydrotherapy features, including heated air and water jets, which the Kohler unit does not offer. You can choose based on your need for warmth, massage intensity, or extra seating space while maintaining a compatible size.
Our top pick: Kohler Underscore 72-Inch Drop-in.
How these tubs differ from Kohler
WOODBRIDGE 72" Heated Soaking Tub
The WOODBRIDGE BJ-400 swaps the Kohler’s wide 44.4-inch footprint for a narrower 35.4-inch width. This makes it suitable for tighter alcoves where the Underscore would not fit. It adds heated water and air jets, features the basic Kohler model lacks entirely. The tub stands 29.1 inches tall, offering deeper water immersion than the Kohler’s 25.3-inch height. You gain active hydrotherapy and thermal retention, but you lose the minimalist aesthetic and the wider seating space of the Kohler. This option suits buyers who prioritize massage intensity and heat over simple, clean lines. It requires a 30-amp circuit, adding electrical complexity compared to the Kohler’s passive design.
WOODBRIDGE 72 Inch Heated Soaking Tub
The WOODBRIDGE BJ-600 matches the Kohler’s 72-inch length but reduces the width to 35.4 inches. It includes a heater and dual jet system, providing heated air massage that the Kohler cannot offer. The height is 22.9 inches, slightly lower than the Kohler’s 25.3-inch profile, which may affect water depth perception. Weighing 137 pounds, it is heavier than the Kohler’s 110-pound unit. You trade the Underscore’s broad, open soak for targeted air therapy and temperature control. This model is ideal for users who want hydrotherapy features in a standard alcove size. It is less suitable if you prefer the wide, unobstructed seating area provided by the Kohler’s 44.4-inch width.
Empava 72" Two-Person Whirlpool Tub
The Empava tub keeps the 72-inch length but expands the width to 48 inches. This creates a significantly wider soaking area than the Kohler’s 44.4-inch width, accommodating two people comfortably. It weighs 196 pounds, much heavier than the Kohler’s 110-pound unit, requiring stronger floor support. The Empava includes whirlpool jets, adding hydrotherapy functions absent in the Kohler. You gain space and active massage but lose the minimalist, jet-free design. The acrylic construction differs from the Kohler’s material, altering the feel and maintenance requirements. This tub is best for buyers with wide alcoves who prioritize seating capacity and massage features over the Underscore’s simple, elegant profile.
WOODBRIDGE 72" Double Slipper Soaking Tub
The WOODBRIDGE BJ-500 offers a 72-inch length with a 35.4-inch width, narrower than the Kohler’s 44.4 inches. It features a heater and dual jets, providing heated water massage that the Kohler lacks. The height is 22.9 inches, lower than the Kohler’s 25.3-inch height. Weighing 130 pounds, it is slightly heavier than the Kohler. You gain thermal comfort and massage intensity but sacrifice the wide, open soaking area of the Underscore. This model fits bathrooms where you can install a 30-amp circuit. It is a practical choice for those who want active hydrotherapy and heat retention in a compact footprint, rather than the Kohler’s passive, minimalist soaking experience.
WOODBRIDGE 72" Double Slipper Soaking Tub
The WOODBRIDGE BJ400 shares the 72-inch length but reduces the width to 35.4 inches. It stands 29.1 inches tall, offering more depth than the Kohler’s 25.3-inch height. The unit weighs 142 pounds, heavier than the Kohler’s 110-pound weight. It includes a combined jet system and heater, delivering hydrotherapy features the Kohler does not have. You trade the Underscore’s wide, simple design for a narrower tub with active massage and heated water. This option suits buyers who prioritize deep, warm soaks and dual-massage therapy. It requires careful planning for electrical support and space constraints, differing from the Kohler’s straightforward drop-in installation and passive soaking capabilities.
WOODBRIDGE 72" Heated Whirlpool & Air Tub
The WOODBRIDGE BJ600 matches the Kohler’s 72-inch length but narrows the width to 35.4 inches. It includes both water and air jets, plus a heater, providing comprehensive hydrotherapy that the Kohler lacks. The height is 22.9 inches, lower than the Kohler’s 25.3-inch profile. Weighing 137 pounds, it is heavier than the Kohler’s 110-pound unit. You gain combined massage types and heated water but lose the wide, unobstructed seating area of the Underscore. This tub fits users who want intense thermal and massage therapy in a standard alcove. It requires significant electrical planning, unlike the Kohler’s passive design. It is best for those prioritizing active features over minimalist aesthetics.
Quick picks
Our 7 picks
Kohler Underscore 72-Inch Drop-in
Best for: minimalist soaking without jets
- Type
- drop-in
- Length
- 74.4 inches
- Color
- Black
- Dimensions
- 74.4 × 44.4 × 25.3 inches
- Weight
- 110 pounds
The Kohler Underscore is a 72-inch drop-in bathtub finished in black. It measures 74.4 inches in length and 44.4 inches in width, offering a substantial footprint for your bathroom. The tub weighs 110 pounds and stands 25.3 inches tall. This model provides a clean, minimalist aesthetic suitable for modern designs. It is a solid choice if you prefer a simple soaking experience without complex jet systems or air features found in other alternatives.
Pros
- 72-inch length provides ample soaking space
- 44.4-inch width offers generous shoulder room
- Available in Black, Biscuit, and White finishes
- Drop-in design fits standard alcove installations
Cons
- No whirlpool jets or air massage features
- Heavier build at 110 pounds requires sturdy support
- Limited to basic soaking without heated options
Good fit if
- You want a minimalist, jet-free soaking tub
- You need a 72-inch drop-in model
- You prefer a black or neutral color finish
Skip if
- You require built-in massage jets or air systems
- You need a heated soaking feature
- You prefer a smaller footprint under 70 inches
Verdict: Kohler Underscore 72-Inch Drop-In Tub is a straightforward, durable option for buyers who prioritize clean lines and basic soaking over hydrotherapy features. It fits well in modern bathrooms where a simple, elegant aesthetic is the main goal.
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 by 35.4 inches. It holds 65 gallons of water with a 14.5-inch soaking depth. You get six body jets and ten air bubble jets. An inline heater keeps water warm. The unit weighs 142 pounds. It fits your bathroom if you want heated hydrotherapy. It suits those who prefer a deep, spacious soak with active massage options.
Pros
- 65-gallon water capacity for deep soaking
- Inline heater maintains water temperature
- Combines whirlpool and air bubble jets
- 14.5-inch soaking depth for full immersion
Cons
- Requires a dedicated 30-amp breaker
- Heavy 142-pound build limits placement
- No app or remote control listed
Good fit if
- You need a dedicated 30-amp electrical circuit
- You prefer heated water for long soaks
- You want both air and water massage jets
Skip if
- You only have a standard 15-amp outlet
- You want a lightweight tub for easy moving
- You prefer a shallow soaking depth
Verdict: WOODBRIDGE 72" Heated Whirlpool Tub offers a deep, heated soak with dual jet types. It is best for users with strong electrical support who want active hydrotherapy.
WOODBRIDGE 72 Inch Heated Soaking Tub
Best for: Deep soaks with heated air massage
- 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 measures 72 by 35.4 inches with a 74-gallon capacity. It combines 10 whirlpool jets and 6 adjustable air jets for hydro massage. An inline heater maintains water temperature via an LED panel. The 13.75-inch soak depth and 137-pound weight define its footprint. It suits those seeking a deep, heated soak with dual massage systems in a compact 72-inch frame.
Pros
- 74-gallon water capacity for full immersion
- Inline heater maintains water temperature
- Combines 10 whirlpool and 6 air jets
- Stainless steel sanitary jets
Cons
- Narrow 35.4-inch width limits lateral space
- Requires a dedicated 30-amp breaker
- Manual air intensity adjustment only
Good fit if
- You need a 72-inch footprint for your bathroom layout
- You want heated water for longer soaking sessions
- You prefer air massage alongside standard whirlpool jets
Skip if
- You require a wider soaking area than 35 inches
- Your electrical panel lacks a dedicated 30-amp circuit
- You want automatic intensity controls for the air massage
Verdict: WOODBRIDGE 72" Heated Air Whirlpool Tub fits bathrooms needing a heated, dual-jet system in a standard 72-inch length. It works best for users who prioritize water temperature retention and air massage intensity over wide seating space.
Empava 72" Two-Person Whirlpool Tub
Best for: wide alcoves and two-person soaking
- Type
- whirlpool
- Material
- acrylic
- Length
- 72 inches
- Drain Location
- left
- Water Capacity
- 110 gallons
- Soaking Depth
- 15.9 inches
The Empava 1125W is a 72 by 48 inch two-person acrylic whirlpool tub. It holds 110 gallons of water with a 15.9 inch soaking depth. The unit includes 10 adjustable water jets driven by a 1.2 HP motor and features chromatherapy lighting. It weighs 196 pounds and has a left-side drain. This wide design suits larger alcove spaces.
Pros
- 72 by 48 inch exterior dimensions for two-person use
- 10 adjustable water jets with 1.2 HP motor
- 15.9 inch soaking depth for deep immersion
- 100% glossy white acrylic with fiberglass reinforcement
- Chromatherapy lighting system for ambiance
Cons
- 48 inch width requires a wider alcove than standard 42 inch tubs
- 196 pound weight adds significant structural load
- Only available in white color
Good fit if
- You have a wide alcove space measuring at least 48 inches
- You prefer a deeper soak with a 15.9 inch water depth
- You want hydrotherapy jets for muscle relief
Skip if
- You need a standard 42 inch width for tight spaces
- You require multiple color options for your bathroom
- You cannot support a 196 pound tub weight
Verdict: Empava 72x48 Acrylic Whirlpool Tub offers a spacious 48 inch width and deep soaking for two people. It fits buyers with wide alcoves who prioritize hydrotherapy and relaxation features over compact sizing.
WOODBRIDGE 72" Double Slipper Soaking Tub
Best for: Heated soaks with dual jet massage
- Material
- Acrylic
- Length
- 72 inches
- Water Capacity
- 69 Gallons
- Soaking Depth
- 14-1/2 inches
- Mount Type
- Freestanding
- Jet Type
- Whirlpool and Air Bubble
This WOODBRIDGE freestanding tub measures 72 inches long and holds 69 gallons of water. It combines whirlpool and air bubble jets with an inline heater. The heated feature maintains water temperature during longer soaks. You get 16 total jets, including stainless steel options. The unit weighs 130 pounds and requires a dedicated 30-amp circuit. It suits those who want hydro-massage and thermal comfort in a deep soaking well.
Pros
- Inline heater maintains water temperature for extended soaks
- 69-gallon capacity with 14.5-inch soaking depth
- Combines 6 body jets and 10 air bubble jets
- 3-speed adjustable air massage intensity
- Stainless steel sanitary full-draining jets
Cons
- Requires a dedicated 110-120V 30-amp breaker
- Narrow 35.4-inch width limits shoulder space
- No smart app or remote control listed
Good fit if
- You want heated water without adding more hot water
- You prefer a mix of air bubbles and water jets
- You have a 30-amp electrical circuit available
Skip if
- You only have a standard 15-amp or 20-amp outlet
- You need a tub wider than 36 inches
- You want a built-in faucet rather than a separate one
Verdict: WOODBRIDGE 72" Heated Soaking Tub is a solid choice for bathers who value thermal comfort and dual-jet massage. It fits well in bathrooms where you can install the required 30-amp circuit and want a deep, heated soak.
WOODBRIDGE 72" Double Slipper Soaking Tub
Best for: Dual massage therapy and extended warm soaks
- Type
- Whirlpool, soaking
- Material
- Acrylic, resin, fiberglass
- Length
- 72 inches
- Water Capacity
- 65 Gallons
- Soaking Depth
- 14-1/2"
- Mount Type
- Freestanding
This freestanding acrylic tub measures 72 inches long and 35-3/8 inches wide. It holds 65 gallons of water with a soaking depth of 14-1/2 inches. You get both whirlpool and air bubble jets for hydrotherapy. An inline heater keeps water warm during longer soaks. The stainless steel jets drain fully to maintain hygiene. This unit weighs 142 pounds and requires a dedicated 30-amp circuit.
Pros
- Combines 6 body massage jets with 10 air bubble jets
- Includes an inline heater to maintain water temperature
- Stainless steel sanitary jets allow full drainage
- UL1795 certified for electrical safety
Cons
- Requires a dedicated 110-120V 30AMP breaker
- Weighs 142 pounds, requiring sturdy floor support
- Only available in white with chrome or black drain
Good fit if
- You want the dual benefit of water pressure and air bubbles
- You need a tub that fits a 72-inch bathroom footprint
- You prefer a freestanding design with a deep soak
Skip if
- Your electrical panel cannot support a dedicated 30-amp circuit
- You need a tub color other than white
- Your floor cannot support a 142-pound empty unit
Verdict: WOODBRIDGE 72" Double Slipper Bathtub offers a robust hydrotherapy experience with its combined jet system and heater. It fits buyers who prioritize deep soaking and dual-massage options over minimalist designs.
WOODBRIDGE 72" Heated Whirlpool & Air Tub
Best for: Heated soaking with combined air and water jets
- Type
- Freestanding bathtub
- Length
- 72 inches
- Water Capacity
- 74 Gallons
- Soaking Depth
- 13-3/4"
- Jet Type
- Whirlpool and Air Bubble
- Color
- White
The WOODBRIDGE BJ600 is a 72-inch freestanding soaking tub with a 74-gallon capacity and a 13.75-inch soaking depth. It combines 6 adjustable body massage jets with 10 air bubble jets for hydrotherapy. An inline heater maintains water temperature during longer soaks. The unit weighs 137 pounds and features stainless steel jets. It suits those seeking a spacious, heated relaxation experience with dual massage options.
Pros
- 74-gallon water capacity for deep soaking
- Inline heater maintains water temperature
- Combines 6 body jets with 10 air jets
- 3-speed adjustable air massage intensity
- Stainless steel sanitary full-draining jets
Cons
- Narrower 35.4-inch width limits side-to-side space
- Manual air control lacks digital precision
- Heater requires separate electrical circuit
Good fit if
- You want heated water for longer soaks
- You prefer air massage combined with water jets
- You need a 72-inch freestanding tub
Skip if
- You require a wider tub for two people
- You want automatic jet controls
- You have limited electrical circuits
Verdict: WOODBRIDGE 72" Heated Whirlpool & Air Tub fits users who prioritize heated water and combined massage types in a 72-inch footprint. It delivers strong hydrotherapy features but requires careful planning for electrical and space constraints.
Specifications side by side
| Spec | Kohler Underscore 72-Inch Drop-in | WOODBRIDGE 72" Heated Soaking Tub | WOODBRIDGE 72 Inch Heated Soaking Tub | Empava 72" Two-Person Whirlpool Tub | WOODBRIDGE 72" Double Slipper Soaking Tub | WOODBRIDGE 72" Double Slipper Soaking Tub | WOODBRIDGE 72" Heated Whirlpool & Air Tub |
|---|---|---|---|---|---|---|---|
| Type | drop-in | Double slipper whirlpool & air | Whirlpool & Air, Soaking | whirlpool | not specified | Whirlpool, soaking | Freestanding bathtub |
| Material | not specified | LUCITE acrylic | LUCITE acrylic | acrylic | Acrylic | Acrylic, resin, fiberglass | not specified |
| Length | 74.4 inches | 72 inches | 72 inches | 72 inches | 72 inches | 72 inches | 72 inches |
| Drain Location | not specified | not specified | not specified | left | not specified | not specified | not specified |
| Water Capacity | not specified | 65 Gallons | 74 Gallons | 110 gallons | 69 Gallons | 65 Gallons | 74 Gallons |
| Soaking Depth | not specified | 14-1/2" | 13-3/4" | 15.9 inches | 14-1/2 inches | 14-1/2" | 13-3/4" |
| Mount Type | not specified | Freestanding | Freestanding | not specified | Freestanding | Freestanding | not specified |
| Jet Type | not specified | Whirlpool and air bubble | Whirlpool and air bubble | whirlpool | Whirlpool and Air Bubble | Whirlpool, air bubble | Whirlpool and Air Bubble |
| Use | not specified | not specified | not specified | Two Person | not specified | not specified | not specified |
| Color | Black | Chrome Drain | With Heater | White | White | White with Chrome Drain | White |
| Dimensions | 74.4 × 44.4 × 25.3 inches | 72 × 35.4 × 29.1 inches | 72 × 35.4 × 22.9 inches | 72 × 48 × 24 inches | 72 × 35.4 × 22.9 inches | 72 × 35.4 × 29.1 inches | 72 × 35.4 × 22.9 inches |
| Weight | 110 pounds | 142 pounds | 137 pounds | 196 pounds | 130 pounds | 142 pounds | 137 pounds |
| Model | K-1137-7 | BJ- 400 | BJ-600 | Whirlpool Bathtub | BJ-500 | BJ400 | BJ600 |
| Size | not specified | 72 Inch | 72 Inch | 72 inches | 72 Inch | 72" | 72 Inch |
If you also manage sewing projects, the brother se2000 5 x 7 alternatives compare working dimensions and hardware specs.
Frequently asked questions
Which Kohler 1137-7 alternative is best for deep soaking?
The WOODBRIDGE BJ-400 and BJ-600 models are ideal for deep soaking. They feature a height of 29.1 inches and 22.9 inches respectively. This depth allows for full submersion. The BJ-400 adds heated water jets for thermal comfort. The BJ-600 focuses on heated air massage. Both retain heat well during long baths.
What is the widest alternative to the Kohler Underscore?
The Empava 72-inch Whirlpool Tub is the widest option. It measures 48 inches across, compared to the Kohler’s 44.4 inches. This extra width accommodates two people comfortably. It also weighs 196 pounds, making it significantly heavier than other alternatives. This tub suits wide alcoves where space is not a constraint.
Do these alternatives include heating elements?
Several WOODBRIDGE models include integrated heating systems. The BJ-400, BJ-500, BJ-600, and BJ400 all feature heaters for water or air. These elements maintain water temperature during soaking. The Kohler Underscore does not list heating capabilities. Buyers seeking thermal retention should choose one of the heated WOODBRIDGE variants.
Which tub is best for small bathrooms?
The WOODBRIDGE BJ-400 and BJ-600 fit tighter spaces. They share a width of 35.4 inches, narrower than the Kohler’s 44.4 inches. The BJ-500 and BJ400 also share this compact width. These models maintain the standard 72-inch length. They allow installation in alcoves where the wider Kohler tub would not fit.
Are there options for two-person soaking?
The Empava 72-inch Whirlpool Tub is designed for two people. Its 48-inch width provides ample seating space. The Empava weighs 196 pounds, indicating a robust construction. Other alternatives like the WOODBRIDGE models are narrower at 35.4 inches. They are better suited for single users or tighter layouts rather than dual occupancy.
What is the weight difference between these tubs?
Weights vary significantly across these models. The Kohler Underscore weighs 110 pounds. The WOODBRIDGE BJ-400 and BJ400 weigh 142 pounds. The BJ-500 and BJ-600 weigh 137 pounds and 130 pounds respectively. The Empava is the heaviest at 196 pounds. Heavier tubs often require stronger floor support during installation.
Which alternative offers the most massage features?
The WOODBRIDGE BJ-400 offers both heated water and air jets. The BJ-600 and BJ400 also provide dual jet systems. These features target hydrotherapy and muscle relief. The Kohler Underscore is a plain soaking tub without jets. If you prioritize active massage, the heated WOODBRIDGE models provide more extensive therapeutic options.