Our Verdict
Kohler Wellworth K-3987-0 — 8.2/10. A reliable, no-frills two-piece toilet that delivers WaterSense-certified efficiency and proven Kohler Class Five flushing performance at one of the brand's most affordable price points.
Kohler Wellworth K-3987-0 — 8.2/10
A dependable, no-frills two-piece toilet that delivers reliable WaterSense-certified flushing performance and classic Kohler build quality at one of the brand's most accessible price points.
Overview
The Kohler K-3987-0 Wellworth is a two-piece elongated toilet designed for homeowners who want the Kohler name behind their bathroom without paying a premium for smart features or designer aesthetics. It ships in Classic White (suffix -0) and uses Kohler's Class Five flushing technology — the same core system found on pricier models — to move waste efficiently on just 1.28 gallons per flush (GPF).
This toilet targets budget-conscious renovators, rental property owners, and anyone replacing an aging builder-grade unit. The elongated bowl offers more seating comfort than a round-front alternative, while the two-piece construction keeps the purchase price down and makes individual component replacement easier if anything ever fails. It also carries EPA WaterSense certification, so it qualifies for rebates in many water districts.
Installation is straightforward for a competent DIYer — the tank and bowl ship separately, the footprint suits a standard 12-inch rough-in, and all mounting hardware is included. What you won't find here is a slow-close seat, a concealed trapway, or any tech-forward extras. If those matter to you, Kohler's own Cimarron or Santa Rosa lines are worth a look. For purely functional, long-lasting everyday use, the Wellworth K-3987-0 is hard to beat at its price.
Key Features
Kohler's Class Five canister-valve technology creates a powerful, swirling flush that clears the bowl completely with 1.28 GPF, well below the federal 1.6 GPF standard.
EPA WaterSense labeling means the toilet meets strict water-efficiency criteria, potentially saving a household up to 13,000 gallons per year versus older 3.5 GPF models.
The elongated bowl shape adds roughly 2 inches of seating length compared with a round-front bowl, improving comfort for most adults.
Separate tank and bowl reduce the unit cost, simplify shipping, and allow individual parts to be replaced without swapping the entire toilet.
Fits the most common rough-in dimension found in North American homes, making it a straightforward drop-in replacement in most bathrooms.
The bowl and tank are cast in Kohler's durable vitreous china, which resists staining and is easy to clean with standard bathroom products.
| Feature | Value |
|---|---|
| Model Number | K-3987-0 |
| Series | Wellworth |
| Configuration | Two-piece |
| Bowl Shape | Elongated |
| Flush Rate | 1.28 GPF |
| Flush Technology | Class Five canister valve |
| Certification | EPA WaterSense |
| Rough-In Size | 12 inches (standard) |
| Seat Included | No (sold separately) |
| Color | White (suffix -0) |
| Material | Vitreous china |
| Overall Height | ~29 inches (without seat) |
| Overall Width | ~18.5 inches |
| Overall Depth | ~28.5 inches |
| Bowl Height (rim) | ~15 inches (standard height) |
| Trapway | Exposed |
| Mounting Hardware | Included |
| Warranty | Kohler limited lifetime |
Pros & Cons
Pros
- Powerful Class Five flush reliably clears the bowl in a single flush
- WaterSense certified — eligible for utility rebates in many areas
- Kohler limited lifetime warranty for genuine peace of mind
- Budget-friendly price for a name-brand toilet
- Standard 12-inch rough-in fits most existing bathrooms
- Two-piece design makes component replacement easy and affordable
- Elongated bowl improves sitting comfort over round-front options
- All mounting hardware included — no surprise trips to the hardware store
Cons
- Toilet seat is NOT included — budget an extra $20–$60 for one
- Standard bowl height (~15 in.) may be less comfortable for taller adults
- Exposed trapway is harder to clean than a skirted design
- Two-piece gap between tank and bowl can harbour moisture and grime
- No slow-close seat, bidet compatibility, or comfort-height option in this model
- Basic aesthetic — not suited to modern or designer bathrooms
Performance
Day-to-day, the Wellworth K-3987-0 punches above its price bracket where it matters most: the flush. Kohler's Class Five canister valve opens fully and immediately, releasing the entire tank volume in a single, swirling torrent that evacuates bowl contents cleanly and consistently. In practical use, double-flushing is rare — a meaningful real-world advantage over cheaper toilets that nominally save water per flush but often require a second cycle.
Noise levels are modest. The flush itself is firm and audible — you won't mistake it for a whisper-quiet model — but the tank refills quickly and quietly, typically returning to silence within 60 seconds. The fill valve and flapper supplied from the factory are standard Kohler parts, which means replacements are widely stocked at home-improvement stores and cost just a few dollars.
Pro tip: Pick up a Kohler-branded slow-close elongated seat (such as the K-4775 or a compatible aftermarket option) at the same time as the toilet — the seat is not included, and you'll want one before first use.
Cleaning is straightforward on the bowl interior thanks to the vitreous china glaze, though the exposed trapway and the seam between the tank and bowl do collect dust and require a little extra attention with a brush or cloth. This is the trade-off common to all two-piece toilets at this price. Over the long term, Kohler's china quality means the surface holds its white finish well and resists the yellowish staining that plagues cheaper materials.
Value for Money
The K-3987-0 consistently sits in the lower tier of Kohler's pricing, making it one of the most affordable ways to get a genuine Kohler toilet with a real manufacturer's warranty. When you factor in the WaterSense water savings — potentially hundreds of dollars over the toilet's lifespan in water bills — and the durability expected from Kohler's vitreous china, the long-term value proposition is strong.
It's the right buy if you're: replacing a builder-grade toilet in a guest bath or half-bath, outfitting a rental property where longevity and low maintenance costs matter more than aesthetics, or working within a tight renovation budget and unwilling to sacrifice flush reliability. It's less ideal if you need comfort height (look at the Kohler Cimarron K-3609 instead), want a skirted base for easier cleaning, or are designing a bathroom where the toilet is a visual focal point.
Rebate note: Because this toilet carries WaterSense certification, many municipal water utilities offer instant or mail-in rebates ranging from $25 to $100. Check your local utility's website before purchasing to maximise savings.
Final Verdict
The Kohler Wellworth K-3987-0 earns its 8.2/10 by doing exactly what it promises: delivering a dependable, water-efficient flush backed by Kohler's limited lifetime warranty at a price that won't stretch a renovation budget. The Class Five flush technology is genuinely impressive at this price point, and the WaterSense certification adds long-term value through water savings and potential utility rebates.
Its shortcomings — no included seat, standard bowl height, exposed trapway — are entirely predictable for the category and price, not design failures. For a functional, everyday bathroom workhorse from a trusted brand, this toilet is a confident recommendation. Just remember to budget for a compatible elongated seat before installation day.
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Does the Kohler K-3987-0 come with a toilet seat?
No. Like most Kohler two-piece toilets at this price point, the K-3987-0 is sold without a seat. You'll need to purchase a compatible elongated toilet seat separately. Kohler makes several options, including soft-close and quick-release versions, and many third-party elongated seats also fit without issue.
What rough-in size does the Wellworth K-3987-0 require?
The K-3987-0 is designed for a standard 12-inch rough-in, which is the most common measurement in North American homes. If your bathroom has a 10-inch or 14-inch rough-in, you'll need a different model. Measure from the finished wall to the centre of the floor flange bolts before ordering.
How much water does the Kohler Wellworth save compared with an older toilet?
Older toilets manufactured before 1994 typically used 3.5 to 7 gallons per flush. The Wellworth K-3987-0 uses just 1.28 GPF. For a household of four flushing an average of five times each per day, that translates to a saving of roughly 8,000–13,000 gallons per year — and a meaningful reduction in annual water bills.
Is the Kohler Wellworth K-3987-0 a comfort-height toilet?
No. The K-3987-0 sits at a standard bowl height of approximately 15 inches to the rim, which is the traditional height found in most homes. If you prefer a taller, ADA-compliant comfort-height bowl (typically 16–18 inches), consider the Kohler Cimarron or Santa Rosa lineup, which offer comfort-height options.
What warranty does the Kohler K-3987-0 carry?
Kohler backs the Wellworth K-3987-0 with a limited lifetime warranty against defects in materials and workmanship. This covers the vitreous china toilet body for life and internal components for a period defined by Kohler's warranty terms. Retain your purchase receipt and register the product on Kohler's website to activate coverage.