Which is better for a deep soak?

The Kohler. Its 139-gallon basin and slotted overflow give a much deeper water line than the Streamline's 16.1 inches.

Will the Streamline fit where the Kohler will not?

Yes. The Streamline is 36 inches wide, a standard alcove size. The Kohler needs 42 inches of width.

The Kohler carries a lifetime limited warranty on the acrylic shell. The Streamline lists no written warranty, so its long-term backing is unclear.

Is the Kohler worth stepping up to?

If you have the space and floor support, yes. You get a bigger basin, a backrest, a heated surface option and a lifetime warranty.

Do I need to buy a drain separately?

For the Kohler, yes. It requires a Kohler Clearflo slotted overflow drain. The Streamline includes an external matte black drain.

How hard is installation?

The Streamline is lighter at 59.5 lb and has leveling feet. The Kohler weighs roughly 85 to 110 lb and needs a reinforced floor and a two-person lift.

Kohler Underscore 72" Bathtub vs Streamline N-4380 72 in. Acrylic Soaking Tub

Buy the Kohler Underscore if you want a wider, deeper tub with a lifetime warranty and a heated surface option. Buy the Streamline N-4380 if your alcove is a standard 36-inch width and you want a lighter tub that is easier to set. The Kohler is the sturdier, better-backed product; the Streamline is the simpler fit for a typical alcove.

Choose the Kohler Underscore if you have 42 inches of width to give and want a deep soak backed by a lifetime limited warranty.
Choose the Streamline N-4380 if your alcove is 36 inches wide and you want a lighter drop-in with an included matte black drain.

Prices

Kohler Underscore 72" Bathtub: $1,908.63 at Amazon (last seen Nov 13)
Streamline N-4380 72 in. Acrylic Soaking Tub: $235.00 at Streamline Bath (last seen Nov 13)
Difference: the Streamline N-4380 72 in. Acrylic Soaking Tub is $1,673.63 cheaper than the Kohler Underscore 72" Bathtub at the latest prices (Nov 13)

Kohler Underscore 72" Drop-In Soaking Bathtub

	Kohler Underscore 72" Bathtub	Streamline N-4380 72 in. Acrylic Soaking Tub
Overall width	42 in, needs a wide alcove or a custom surround	36 in, fits a standard alcove
Water capacity	139 gal to the overflow	63 gal
Soaking depth	Deep, with a slotted overflow that raises the water line	16.1 in
Weight	About 85 to 110 lb, so plan for two people or a lift	59.5 lb, easier for one or two people to set
Warranty	Lifetime limited warranty on the acrylic shell	No written warranty stated
Drain	Drain sold separately; slotted overflow design	External matte black drain included; pop-up
Comfort features	Sloped backrest; Basket Heated Surface option	Textured bottom; adjustable leveling feet
Finish and look	Smooth white acrylic, contemporary rectangle	Glossy white with a matte black drain accent

Spec	Kohler Underscore 72" Bathtub	Streamline N-4380 72 in. Acrylic Soaking Tub
Exterior Dimensions	72" x 42"	72'' L X 36'' W X 22.8'' H
Height	23 in	22.8 in. (overall)
Length	72"	72 in.
Soaking Depth	Deep soaking	16.1 in.
Width	42"	36 in.
Depth	42"	36 in
Tub Capacity	139 Gallons	63 gallons
Weight	85 LBR	59.5 lb
Shape	Rectangle	Rectangular
Bathtub Type	Drop-in	Soaking Bathtub
Product Type	Bathtub	Bathtub
Configuration	Soaking tub	Soaking tub

Spec	Kohler Underscore 72" Bathtub	Streamline N-4380 72 in. Acrylic Soaking Tub
Skirt Type	Drop-in Skirt	Drop-in Skirt
Drainage Type	Slotted overflow drain	Pop-up drain
Features	Sloped backrest	Textured bottom surface, Overflow
Material	Acrylic	Acrylic
Overall Dimensions	72" x 42"	—
Interior Dimensions	45.75 in (basin length)	—
Inner Shape	Sloped backrest	—
Shower Option	No	—
Heating Type	Bask Heated Surface	—

Kohler Underscore 72" Bathtub vs Streamline N-4380 72 in. Acrylic Soaking Tub

Prices

Kohler Underscore 72" Bathtub vs Streamline N-4380 72 in. Acrylic Soaking Tub

Prices

Kohler Underscore 72" Bathtub

Streamline N-4380 72 in. Acrylic Soaking Tub

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Kohler Underscore 72" Bathtub

Streamline N-4380 72 in. Acrylic Soaking Tub

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Kohler Underscore 72" Bathtub

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