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Internet # 307908571

Model # K-78279-0

Store SKU # 1003951328

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Highline Arc 12 in. Rough In 2-Piece 1.28 GFP Single Flush Elongated Chair Height Toilet in White with Soft Close Seat

$199.00
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  • Made of vitreous, ADA comfort height, 1.28 GPF canister flush
  • Class Five canister provides powerful and effective flush
  • Soft close toilet seat, wax ring, and hardware included
  • View More Details

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Product Details

About This Product

Trusted for years by professionals, Highline toilets are KOHLER's bestselling toilet family. A brilliant blend of style and water efficiency, this Highline Arc toilet is distinguished by an elegant flared tank. Coupled with KOHLER's powerful canister flush valve, there's no sacrificing performance for design. An innovative 1.28 Gal. flush setting provides significant water savings of up to 16,500 Gal. per year, compared to an old 3.5 Gal. toilet. This Complete Solution package includes everything necessary for installation and is available exclusively at The Home Depot.

Highlights

  • 2-piece toilet
  • Elongated bowl offers added room and comfort
  • Comfort height feature offers chair-height seating that makes sitting down and standing up easier for most adults
  • 1.28 Gal. Per Flush (GPF)
  • Standard left-hand polished chrome trip lever included
  • Complete solution toilets provide everything you need in 1 box, including bowl, tank, slow-close toilet seat, cover, wax ring and floor hardware
  • Single-flush gravity uses the force of gravity and a precision-engineered tank, bowl and trap way to create a strong siphon during flushing
  • Class 5 flushing technology offers virtually plug-free performance and rinsing power for a clean bowl
  • Standard 12 in. rough-in
  • 3-bolt installation
  • Supply line not included
  • WaterSense
  • Click here to shop for more Kohler products
  • Return Policy
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Product Information

Internet # 307908571

Model # K-78279-0

Store SKU # 1003951328

Specifications

Dimensions: H 30.36 in, W 15.47 in, D 29.54 in

Dimensions

Product Depth (in.)

29.54 in

Product Height (in.)

30.36 in

Product Width (in.)

15.47 in

Details

Bowl Height

Chair Height

Bowl/Seat Shape

Elongated

Color Family

White

Color/Finish

White

Commercial / Residential

Residential

Features

No Additional Features

Flushing Technology

Gravity Fed

Flushing Type

Single Flush

Gallons Per Flush

Single Flush: 1.28

Handle Location

Left

Included

Complete Kit

Material

Vitreous China

Returnable

90-Day

Rough In Size

12 inch Rough In

Style

Modern

Toilet Type

Two-Piece

Trapway Diameter (in.)

2.125 in.

Trip Lever Location

Left Front

Warranty / Certifications

Certifications and Listings

ADA Compliant, ASME Certified, CSA Certified, EPA Approved

Manufacturer Warranty

Lifetime Limited Warranty

Questions & Answers

how high is the seat?
ByApr 16, 2026
1 Answer | 
Answer This Question

Hello, my name is Jessica with Kohler Customer Service. I am happy to assist with your inquiry. The height of the bowl packaged with K-78279-0 measures 16-1/2" from the floor to the top of the bowl without the seat installed. The seat adds 1-15/16" of height to the bowl. The following link is to the specification sheet showing this on page 3 as well: https://tinyurl.com/37bke9kr. Thank you for choosing Kohler.

By|Apr 16, 2026


    Are bone and biscuit the same color
    ByApr 14, 2026
    1 Answer | 
    Answer This Question

    Hello Steve, this is Paige with Kohler Customer Service. I am happy to help. Kohler does not have a "bone" finish, so we are not able to compare the two. We would suggest going to a local Kohler dealer to view the product in person. Thank you for choosing Kohler.

    By|Apr 15, 2026


      Is the back of toilet cover supposed to be at a slant and not flat
      ByApr 14, 2026
      1 Answer | 
      Answer This Question

      Hi Jenn, this is Quinn with Kohler Co. I am happy to answer your question. Yes, the tank cover should be level there should not be a noticeable slant to it. If there is, please reach out directly to kohlercustserv@kohler.com so we can help in finding a solution. Thank you for choosing Kohler.

      By|Apr 16, 2026


        Are the bolts that come with it, silver or gold color?
        ByApr 14, 2026
        1 Answer | 
        Answer This Question

        Hi, my name is Meli with Kohler Co. I am happy to assist with your question. The included t-bolts are stainless steel. Thank you for choosing Kohler.

        By|Apr 15, 2026


          What is arc
          ByApr 14, 2026
          0 Answer | 
          Answer This Question

          Does this have a wooden toilet seat? If not suggest a wooden replacement
          ByApr 14, 2026
          1 Answer | 
          Answer This Question

          Hi Linda, my name is Meli with Kohler Co. I am happy to assist with your question. The Highline Arc Extra Tall toilet includes a plastic toilet seat. For a wooden toilet seat, we would recommend our Stonewood K-20466. Thank you for choosing Kohler.

          By|Apr 15, 2026


            Does all hardware come with it
            ByApr 13, 2026
            1 Answer | 
            Answer This Question

            Patrick, my name is Jessica with Kohler Customer Service. I am happy to assist with your inquiry. K-78305 includes the tank, bowl, seat, wax ring and hardware (https://tinyurl.com/5cj6k6jd). Thank you for choosing Kohler.

            By|Apr 15, 2026


              How high is the seat?
              ByApr 13, 2026
              1 Answer | 
              Answer This Question

              Donald, my name is Jessica with Kohler Customer Service. I am happy to assist with your inquiry. The height of K-78279 from the floor to the top of the bowl measures 16-1/2" from the floor to the top of the bowl without the seat installed. The seat adds another 1-15/16". The following link is to the specification sheet showing this on page 3 as well: https://tinyurl.com/37bke9kr. Thank you for choosing Kohler.

              By|Apr 15, 2026


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                Customer Reviews

                4.5 out of 5

                • 4.5 out of 13,911 reviews
                • 77% recommend this product
                Filter by:
                Showing 1-10 of 13,911 reviews
                iI’m a plumber, and I always recommend this brand of toilet because they operate properly. They are low maintenance, last a long time, and flush effectively.
                by
                2 found this review helpful
                This customer chose to rate the product and not provide text.
                by
                Very easy installation and it came all the items needed to complete the entire setup. I came away happy with this purchase and would get it again as it replaced my previous 20 year old toilet.
                by
                We chose these toilets because of their sleek look and the height of the toilet. It is made sturdy so even larger people don’t have a problem sitting or feeling comfortable on the toilet. The shipping was perfect and nothing at all was damaged. Definitely meets expectations. /Users/tamiables/Desktop/IMG_8791.heic
                by
                Had Plumber install the toilet and Dino’s Plumbing of Las Vegas did a fantastic job. Toilet is very efficient and adds value to the bathroom.
                by
                • Verified Purchase
                Bad
                We have had this toilet for about a month and have had issues with the toilet seat it continues to loosen and it’s very hard to install properly. I would not recommend due to this.
                by
                Response from Kohler Product ExpertMar 10, 2026
                Hello, my name is Jessica with Kohler Customer Service. I am sorry to hear your toilet seat is loose on the bowl. This is nothing you should expect during normal use. Please verify that the hinge covers are snapped down over the arms ("U" shaped bracket that fits around black hinge mount) located at the back of the toilet seat and that the mounting hardware has been tightened. If the issue continues, please contact our Customer Service team at KohlerCustServ@kohler.com. We look forward to hearing from you soon. - Jessica P. Kohler Customer Service.
                  2 found this review helpful
                  Cheap quality
                  Nasty cheap quality. Look at the picture, now I have to buy seats
                  by
                  Response from Kohler Product ExpertMar 3, 2026
                  Global, my name is Jessica with Kohler Customer Service. I am sorry to hear you are not satisfied with the Highline Arc toilet. We put a lot of thought into our products, so it is unfortunate whenever we do not meet a customer's expectations. We would like to connect with you to hear more about your experience and aid in a resolution. Please contact our Customer Service team at KohlerCustServ@kohler.com. We look forward to hearing from you soon. - Jessica P. Kohler Customer Service.
                    2 found this review helpful
                    This toilet is for my investment property. We purchased multiple before. The price is not too high while the quality is acceptable. No complaint at the moment. Happy
                    by
                    1 found this review helpful
                    This toilet exceeded my expectations. It flushes powerfully and quietly, leaving the bowl completely clean every time. The comfort-height design and elongated seat make it very comfortable, and installation was straightforward. It looks sleek, modern, and has significantly improved our bathroom’s functionality. Highly recommend for performance and style. Really was a great upgrade to my bathroom!
                    by
                    3 found this review helpful
                    Too Tall for the Average Person. The toilet flushes well andworks as expected. However, unless you are over 5'8" tall, this isn't the one you should buy. I am 5'8" and when I sit on it, my feet don't rest flat on the floor. The way the seat is designed, with a bowl shape that slants toward the hole, causes the edge to dig into your thigh across the front of the toilet. Another annoying design flaw is the flush handle is situated almost completely behind the lip of the seat. (see picture) You need to get your hand behind the lid to flush it. Overall, I regret this purchase. Between the cost of the toilet and the cost of paying a plumber to install it, this has been an expensive mistake on my part that I will have to live with for many years.
                    by
                    Response from Kohler Product ExpertFeb 14, 2026
                    Hello Donna, this is Paige with Kohler Co. I am sorry to hear that the Highline Arc extra tall toilet was too tall for your preference. We strongly encourage customers to view a products specification sheet prior to purchase. On this sheet, you will find all of the necessary dimensions to help you make the right selection to fit your needs. For additional product assistance, please email our team at KohlerCustServ@Kohler.com. Kindly, Paige S. -Kohler Customer Service
                    • Verified Purchase
                    6 found this review helpful
                    Showing 1-10 of 13,911 reviews