KOHLER Wellworth Dual Flush Toilet Review

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The K-3987-47 Wellworth is dual flush toilet has a rounded front that requires less floor space than the elongated toilets, suitable for smaller bathrooms and powder rooms. It is one of our Top-Rated Dual Flush Toilets. Let’s read the details in this Kohler Wellworth toilet review.

The fact that the toilet is a little smaller does not reduce the efficiency of the toilet. The Kohler Wellworth has a Class 5 flush system that can remove a large quantity of waste in just one flush and still meet the EPA Water Sense specifications for low water consumption.


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Design / Materials

This two-piece toilet is made from vitreous china and finished in an almond color. Unusually for a dual flush toilet, it has a single lever to activate both flushes, rather than the standard buttons on top of the tank. On installation, the tank is joined to the base with three fixings.

KOHLER K-3987-47 Wellworth Two-Piece Round-Front Dual-Flush Toilet with Class Five Flush System and Left-Hand Trip Lever, Almond

Flushing System

Kohler’s class 5 toilets are renown for the amount of waste that they can flush away in a single flush, even with only 1.28 gallons of water. The dual flush system delivers a full flush of 1.28 gallons or a partial flush of 1.1 gallons.

This video, from Kohler, explains the way that the flushing system works.


On a full 1.28 gallon flush, this toilet will clear up to four times the volume of waste that the average adult needs. This efficiency in clearing waste is due to a combination of the siphon action giving additional power to the water entering the bowl, the way that the water enters the bowl around the full circumference of the rim, and the design and shape of the toilet bowl.



This toilet has a dual flush delivering either 1.28 gallons of water per full flush or 1.1 gallons on a partial flush. The toilet, due to its low water consumption plus the ability of the toilet to clear all waste in a single flush is what make the toilet EPA Water Sense certified. Water Sense certified toilets can, in many areas, qualify for rebates from water bills. To check if your area is covered check out the EPA Water Sense rebate finder page.


Ease of Installation

The toilet uses a standard rough in of 12” to the center of the waste pipe from the wall. To install the toilet you need to have a new trap seal, new T-bolts (and nuts) if your existing ones are corroded and a toilet seat. To function correctly, the bowl needs to be level. The level of the bowl can be adjusted by tightening the three mounting bolt incrementally until the level is achieved. This pdf from Kohler give full installation details, including the tools required.

kohler wellworth dual flush toilet review

ProsKOHLER K-3987-47 Wellworth Two-Piece Round-Front Dual-Flush Toilet with Class Five Flush System and Left-Hand Trip Lever, Almond

  • Two-piece toilet
  • Rounded front, takes up less floor space than an elongated front toilet
  • Dual flush system
  • Siphonic flush to boost cleaning efficiency
  • Class 5 cleaning action – high volume waste removal in one flush
  • 2 1/8” fully glazed trap way
  • EPA Water Sense certified
  • Lever flush trip – uncommon in dual flush toilets
  • 1 year limited warranty



  • Replacement parts can be expensive if needed.


Overall                4.7/5

As stated in above Kohler Wellworth dual flush toilet review, it’s a highly efficient, great value for the price toilet. It is EPA Water Sense approved and, if you are eligible for the rebates, can work out only a little more expensive than repairing and existing toilet.

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KOHLER Wellworth Dual Flush Toilet
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