Is the seat included? If not, which seat (soft close) is best to match the elongated bowl?

No the seat wasn't included. I recommend soft close.

Is the 1.1gal flush quieter than the 1.6gal flush? Would you categorize this toilet as quiet?

Yes, the 1.1 gal flush is quieter because there is less water involved. And the toilet is quieter overall than our old one.

What is the offset measurement on this toilet?

If you mean the "rough-in" distance for the floor bolts its 12 inches. The specs can be found here.... http://www.us.kohler.com/onlinecatalog/pdf/K-3988_spec.pdf I never actually used this product. I had to return it because mine came defective. I also had some frustrating problems with the delivery. Amazon was good about taking it back and giving me a full refund. Good Luck

Is this a standard toilet height

yes, it is and it works great! Much better than the $700 toilet I have in the master bathroom

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Description

🚽 Flush Smarter, Live Greener — The KOHLER Wellworth Dual-Flush Revolution

SPACE SAVVY DESIGN - Side-mounted flush lever frees up tank top for extra bathroom storage or decor.
ECO FRIENDLY IMPACT - Potentially saves more than 4,000 gallons of water annually per toilet—good for your wallet and the planet.
SMART WATER SAVINGS - Dual-flush lever lets you choose between 1.1 or 1.6 gallons per flush, cutting water use by over 30%.
POWERFUL QUIET FLUSH - Class Five flush system ensures reliable, clog-free performance every time.
COMFORT MEETS EFFICIENCY - Elongated bowl design maximizes seating comfort for your daily routine.

The KOHLER K-3988-0 Wellworth is a two-piece, elongated dual-flush toilet featuring a Class Five flush system and a convenient left-hand trip lever. It offers a choice between 1.1 and 1.6 gallons per flush, reducing water consumption by over 30% and saving more than 4,000 gallons annually. Its side-mounted lever design frees tank top space, combining powerful performance with eco-conscious efficiency.

Specifications

Color	White
Product Dimensions	29.25"D x 18"W x 30"H
Material	China
Brand	KOHLER
Item Weight	3.2 ounces
Installation Type	Floor Mounted
Shape	Oval
Seat Material Type	Plastic
Manufacturer	Kohler
UPC	650531946850
Global Trade Identification Number	00650531946850
Part Number	3988-0
Item model number	K-3988-0
Is Discontinued By Manufacturer	No
Size	-1
Item Package Quantity	1
Number Of Pieces	1
Water Consumption	1.6 Gallons per Flush
Flush Type	Gravity Flush Toilets
Number of Handles	1
Certification	Yes
Included Components	Product Only
Batteries Included?	No
Batteries Required?	No
Warranty Description	One-year Limited Warranty

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