Pick the Kohler PureWash M300 (K-98804) if you want front and rear washes and a slimmer side lever; pick the M250 (K-5724) for a simpler single-wand seat. Both are non-electric, elongated seats that wash with cold supply water, so check bowl shape and tank clearance first.
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This guide compares Kohler’s two non-electric PureWash bidet seats using Kohler’s spec sheets and drawings.
PureWash M250 vs M300 (Kohler spec sheets)
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| Seat | Wash | Width (seat / with handle) | Min. bolt holes to tank |
|---|---|---|---|
| M250 K-5724 | Single wand; spray position and pressure by side handle | 14-5/16 / 17-11/16 in. | 2-1/8 in. |
| M300 K-98804 | Dual-function wand, front and rear; pressure by side lever | 14-1/2 / 16-3/16 in. | 1-1/2 in. |
Both drawings show 18-11/16 inches from the mounting-hole centerline to the front of the seat. Both use ambient water from the toilet supply, need no batteries or power, and carry Kohler’s one-year limited warranty.
Which Kohler bidet seats this guide covers
Kohler sells its bidet seats under the PureWash name, in manual models that need no power and electric models with heated water and seats. This guide covers the two manual seats we could fully check: the M250 and M300.
We also checked Kohler’s electric seats. On October 15, 2026, the E835 was sold by Amazon.com, but we could not find a current Kohler spec sheet for it, so we do not recommend it here. The E580 and E590 had spec sheets, but their Amazon offers came from third-party sellers, and we only link powered seats sold by Amazon.com or the brand. For heated electric seats, see our TOTO Washlet guide or Brondell bidet guide.
Kohler PureWash M250 K-5724: simple single-wand seat
Choose the Kohler PureWash M250 if you want the simplest non-electric Kohler bidet seat. The K-5724 spec sheet (resources.kohler.com) lists a single wand for ambient-water cleansing, spray position and pressure adjusted with a side handle, a self-cleaning wand that rinses after each use, a Quiet-Close lid and seat, Quick-Release removal for cleaning, Quick-Attach hardware and Grip-Tight bumpers.
It is the wider of the two: Kohler’s drawing shows 17-11/16 inches across including the handle. The drawing also shows a 13-1/4-inch minimum from the mounting-hole center to a side wall on the handle side, and at least 2-1/8 inches from the mounting-hole centerline to the tank. In a narrow toilet alcove, measure both before you order.
Kohler lists White (-0) and Biscuit (-96). On October 15, 2026, the standard new offer sold by Amazon.com showed stock with model 5724-0, White.
Check Kohler PureWash M250 K-5724-0 bidet seat (white) on Amazon →
Kohler PureWash M300 K-98804: front and rear wash
Choose the Kohler PureWash M300 if you want separate front and rear cleansing. The K-98804 spec sheet (resources.kohler.com) lists a dual-function wand for front and rear cleansing with ambient water, a side lever for pressure, a self-cleaning wand, Quiet-Close lid and seat, Quick-Release removal and Grip-Tight bumpers.
It is slimmer at the side: 16-3/16 inches across with the lever, and it needs only 1-1/2 inches from the mounting-hole centerline to the tank. Its sheet lists ASME A112.4.2/CSA B45.16 and IAPMO certification; the M250 sheet lists no applicable codes or standards.
Kohler lists it in White (-0) and recommends it with its K-3999 and K-31621 two-piece elongated toilets. On October 15, 2026, the standard new offer sold by Amazon.com showed limited stock with model 98804-0.
Check Kohler PureWash M300 K-98804-0 bidet seat (white) on Amazon →
Check your toilet before you order
Both seats are elongated only. Measure from the center of the seat bolt holes to the front of the bowl; Kohler’s drawings put the seat front 18-11/16 inches from that line, so a standard elongated bowl is the match. Our round vs elongated guide shows how to tell which you have.
Check the gap between the bolt holes and the tank: at least 2-1/8 inches for the M250 or 1-1/2 inches for the M300, per Kohler’s drawings. On some toilets the tank sits close to the bolt holes, so measure rather than assume.
Both sheets list 5-1/2-inch mounting-hole spacing, so measure the distance between your bowl’s two seat holes too. Our toilet seat size guide covers the measurements.
Water supply: what Kohler requires
Each sheet says the seat connects to the toilet water supply line and that all hoses and connections are included. Kohler says to connect only to a cold water supply of drinking-quality water at 20 to 80 psi, and warns against a supply above 104°F because of scald risk.
So do not connect either seat to a hot-water line. If your home’s pressure runs above 80 psi, our pressure-reducing valve guide explains the valve that controls it.
Shut off the toilet stop before you start, and replace a stiff or leaking stop first. Our shutoff valve guide covers options. Install the seat according to Kohler’s installation guide for your model.
Why choose a manual bidet seat
A manual seat needs no outlet near the toilet. If your bathroom has no receptacle within reach of the seat, a manual model avoids adding one, and Kohler lists no batteries or electrical power for either seat here.
The trade-off is water temperature. Both PureWash manual seats wash with ambient water from the cold supply, so in winter the wash feels as cold as the water coming into the house. If warm water matters, a heated electric seat is the upgrade, and it will need an outlet within reach of its cord.
If you would rather keep your current seat, our bidet attachment guide covers attachments that fit under it.
Cleaning and care
Both sheets list a self-cleaning wand that rinses itself after each use, and Quick-Release functionality so the seat lifts off the bowl for cleaning underneath and around the hinge area. Grip-Tight bumpers are listed to hold the seat firmly in place on the bowl.
After installing either seat, turn the supply back on slowly, run one wash cycle, and look at every hose connection for drips before you walk away. Check again the next day. A slow drip at a supply connection can damage the floor long before anyone notices it.
Kohler seats without a bidet
If you want a Kohler seat without a bidet, our Kohler toilet seat guide compares Kohler’s regular seats, including Quiet-Close and ReadyLatch models. Our bidet seat guide compares bidet seats across brands.
Frequently asked questions
What is the difference between the Kohler PureWash M250 and M300?
The M250 has a single wand with a side handle for position and pressure. The M300 has a dual-function wand for front and rear cleansing and a slimmer side lever.
Do Kohler PureWash manual seats need electricity?
No. Kohler lists manually operated handles that need no batteries or electrical power.
Do Kohler PureWash seats have warm water?
The M250 and M300 use ambient water from the cold supply. Heated water needs an electric seat.
Will a Kohler PureWash seat fit my toilet?
Both are elongated with 5-1/2-inch mounting holes. Check the gap from the bolt holes to the tank: 2-1/8 inches minimum for the M250, 1-1/2 inches for the M300.
Can I connect a Kohler bidet seat to hot water?
No. Kohler says to connect only to a cold drinking-quality supply at 20 to 80 psi and warns against water above 104°F.
How we chose
This document-based guide makes no hands-on testing claim. We read Kohler’s spec sheets for the PureWash M250 K-5724 and M300 K-98804 and inspected their dimension drawings. On October 15, 2026, both linked standard new offers were sold by Amazon.com and showed stock. Electric PureWash seats were checked but not recommended for the reasons stated above. Read our selection method and about Plumbing Picks.
Primary sources
- Kohler PureWash M250 K-5724 spec sheet (resources.kohler.com): features, drawing (widths, 18-11/16 in., 2-1/8 in. min to tank, 13-1/4 in. side clearance), colors, supply 20-80 psi, 104°F warning.
- Kohler PureWash M300 K-98804 spec sheet (resources.kohler.com): features, drawing (widths, 1-1/2 in. min to tank), codes, recommended toilets, supply limits.