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1.28 vs. 1.6 GPF Toilets: Which to choose?

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taylorgeo
taylorgeo Member Posts: 74
Private house, family of four.

Comments

  • ChrisJ
    ChrisJ Member Posts: 15,866
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    You can keep all of this in one thread.

    In fact, it would probably be highly beneficial to you because everyone could see the history of the discussion to help see what you're trying to accomplish.

    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • taylorgeo
    taylorgeo Member Posts: 74
    edited September 2022
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    @ChrisJ

    Yeah, good point. My bad.

    So my supply house only has an American Standard Cadet PRO in a 1.28. I currently have a 25-year-old Kohler 1.6.

    I'm surprised I can't get the 1.6 AS from the supply house. Should I just go with the 1.28?

    Thanks!
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,764
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    you can do what i do and flush 2x if you have to
    GGross
  • Robert_25
    Robert_25 Member Posts: 531
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    We have a 10 yr old Kohler 1.6, Toto 1.28, and a Delta 1.28 in our house.  I would not buy another 1.6 toilet.

    although the Toto is my favorite I would give the Delta my “Best Buy” rating.  It was inexpensive and works great.
  • taylorgeo
    taylorgeo Member Posts: 74
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    @Robert_25

    Cool, thanks for the info.

    The 1.28 is also WaterSense Certified. Not sure how big of a deal that is.
  • ChrisJ
    ChrisJ Member Posts: 15,866
    edited September 2022
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    taylorgeo said:
    @Robert_25 Cool, thanks for the info. The 1.28 is also WaterSense Certified. Not sure how big of a deal that is.
    Personally i don't care what it's certified.  I just want sh......poo to go down everytime. I don't care if it's 1.25 gallons or 5 gallons.

    But that's me.
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,764
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    I have 2 1.6gph Kohler's. The round one would pull your arm to the sewage plant. The one upstairs with the elongated bowel is just ok
  • ChrisJ
    ChrisJ Member Posts: 15,866
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    I have 2 1.6gph Kohler's. The round one would pull your arm to the sewage plant. The one upstairs with the elongated bowel is just ok
    Are they both the same age and model other than elongated vs round?

    I have a 1.6 Kohler that's one of the worst I've ever used.   I also have a 1.6 Gerber that's amazing.
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,764
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    @ChrisJ yes within a couple months of each other
  • mattmia2
    mattmia2 Member Posts: 9,843
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    I think this comes more down to design than amount. There are terrible 1.6 toilets and great 1.2 toilets.
  • ChrisJ
    ChrisJ Member Posts: 15,866
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    mattmia2 said:
    I think this comes more down to design than amount. There are terrible 1.6 toilets and great 1.2 toilets.
    That's why I said I don't care how much water it uses as long as it does the job well.

    1.2,1.6,3,5. Don't care.
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • HomerJSmith
    HomerJSmith Member Posts: 2,479
    edited September 2022
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    The problem is and always has been "solids transport". The lower the flush quantity, the more the chance of waste being left behind. The dia of the soil piping has a lot to do with moving solids down the line. Too big a pipe and too little water makes Roto Rooter a happy camper.

    Yes, a low flush toilet saves water, but not if you have to flush twice and certainly doesn't pay off if you have to call a rooting service. Bureaucrats are poor planners. As for me 1.6 is my choice. If that choice doesn't exist than 1.28 rated at a 5. Dual flush is the way to go. One for liquid wastes and one for solid wastes.
  • pedmec
    pedmec Member Posts: 994
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    The problem is you wont know until you buy it and have it installed. That's when you find out whether you bought a good one or not.
  • taylorgeo
    taylorgeo Member Posts: 74
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    @HomerJSmith

    "1.28 rated at a 5"

    How would I find that out?

  • BenDplumber
    BenDplumber Member Posts: 49
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    ,I have had great luck with the Gerber Viper 1.6 gpf. Easily repaired with a flapper and fludmaster ballcock found easily at any hardware store. Code around here requires a branch drain of higher discharge i.e washing machine,lavatory, shower downstream of the water closet connection to increase drainline carry of solids from a low flush water closets in new construction. That being said I still have 50 year old American Standard 3.5 gpf water closets that perform flawlessly. If you have a older home with cast iron drainage piping at a minimum slope, I would suggest spending the most you can afford on a name brand closet from a plumbing wholesaler, rather than the big box stores. All new water closets must meet a standard in testing for bowl clearage and drainline carry under ideal factory conditions with new clear pvc piping for verification.Unfortunatly in the real world I think we are all know how that works out...double flushes, single ply sandpaper toilet paper and visits from the local sewer rodder. Toto is also a good choice however if the model has a G-MAX flange I would recommend having a plumbing contractor do the installation.
    GGross
  • Robert_25
    Robert_25 Member Posts: 531
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    taylorgeo said:

    @HomerJSmith

    "1.28 rated at a 5"

    How would I find that out?

    You can read a lot of toilet reviews online. I found Terry Love's summary very helpful: https://www.terrylove.com/crtoilet.htm

    Yesterday I noticed that our last old toilet (1980's American Standard, 3.5 GPF I think) is leaking past the flapper. I know it is a cheap fix, but I decided it is a good time to upgrade. I ended up ordering a Toto Drake 1.28 GPF.
    MikeL_2
  • TAG
    TAG Member Posts: 755
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    ChrisJ said:


    mattmia2 said:

    I think this comes more down to design than amount. There are terrible 1.6 toilets and great 1.2 toilets.

    That's why I said I don't care how much water it uses as long as it does the job well.

    1.2,1.6,3,5. Don't care.

    My old suburban house has a very long main drain -- it's a big long extended cape on a rise with a walk out lower level. I remodeled the second floor bath when I bought it years ago and in went a low flow toilet ... we would have a problem almost every summer when the house was mostly empty. The toilet did not give enough water to flow all the way out to the street and clogs would occur at the main trap/ back flow. The other toilets in the house were water hog lowboy Kohler. The fix was to switch it out. Same with an old farm house I had w/ septic -- I mentioned in another thread I needed to get a pressure assist for that one. It must have had some wacky fittings to the main and needed the push ....