In-Wall Flush Tank Toilets
In Wall toilet flush tank systems, usually for wall-mounted toilets, are described here.
Page top sketch: the in-wall tank for a Toto DuoFit concealed flush tank toilet, cited & discussed below on this page.
This article series describes the different types and models of toilets: historical or old toilet types, wooden high wall-tank toilets, conventional reservoir tank toilets, low-flush toilets, water saving toilets, back-flush toilets, up-flush toilets, and even chemical toilets.
Here we explain how to diagnose and repair problems with toilets, leaks, flushes, odors, noises, running and wasted water.
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Toilet Water Flush Tank In-Wall Tank Systems, Cistern Concealed in Wall
These toilet designs use an in wall flush tank or cistern that is concealed in the building wall above and usually behind the toilet, as we illustrate below with this toilet installed in a Venice, Italy apartment, photo taken by the author in 2017.

While the Venetian toilet above is supplied with flush water from a tank concealed in the bathroom wall (notice the flush control panel in the white area above the toilet), other modern toilets combine a wall-mounted back-flush toilet with a flush tank also concealed in the wall.
For an example installation and owner's manual for in wall tank system toilets see this Toto wall mount toilet that uses a concealed in-wall flush tank.

This Toto toilet drains into the wall to right, left, or straight down.
IO Manuals For In-wall Concealed Flash-Tank Toilets

- DXV Modulus™ Wall Hung Dual Flush
Toilet with Seat
Model D23040A [PDF] DXV One Centennial Avenue Piscataway, New Jersey 08855 USA (800) 227-2734 www.DXV.com / In Canada:
DXV 5900 Avebury Road Mississauga, Ontario L5R 3M3 Canada
Toll Free: 1-800-387-0369 / DXV Via Morelos 330 Col. Santa Clara Coatitla Ecatepec, Estado de México 55540 Toll Free: 01-800-8391200 www.DXV.mx
- Gerberit Duofix WALL HUNG TOILET INSTALLATION MANUAL [PDF] (2021) Geberit , 2100 Clearwater Drive, Des Plaines, IL 60018-5999
Phone: (847) 803 5000
Fax: 847/803-5454
For Technical Assistance: 800 / TEC-TRUE (800-832-8783) www.geberit.us - - Geberit International AG, Schachenstrasse 77, CH-8645 Jona
T +41 55 221 63 00
F +41 55 221 63 16
documentation@geberit.com
www.geberit.com - retrieved 2022/02/13 original source: https://www.geberitnorthamerica.com/local-media/instructions/968-075-00-0-sigma2x4-install.pdf
- Grohe WALL-HUNG TOILET INSTALLATION INSTRUCTIONS [PDF] Grohe, U.K., Web: https://www.grohe.co.uk/ - retrieved 2022/02/13 original source: https://www.grohe.co.uk/en_gb/our-service/installation-videos/install-wc-solutions.html
- Kohler ODEON In-Wall Tank TOILET FLUSH TANK INSTALLATION INSTRUCTIONS [PDF] - retrieved 2022/02/13 original source: http://tech.kohlerthai.com/upload/Technical/quick_170222143436.pdf
Excerpt:
Installation of in-wall tank is much easier and nicelooking comparative to that of traditional tank.
Meanwhile, the space layout will be more
reasonable due to the application of in-wall tank
pipes and connectors.
The most remarkable advantage of in-wall tank is
that the installation will never be limited to certain area,
and can be installed wherever as you wish, which will
make the bathroom layout more reasonable and nicelooking, and make good use of every inch of the
bathroom space.
- Toto DuoFit In-Wall TOILET TANK SYSTEM INSTALLATION & OWNER'S MANUAL [PDF] (2011) TOTO U.S.A. Inc., Customer Service Department, 1155 Southern Road, Morrow, GA 30260
(888) 295-8134 or (678) 466-1300 when calling from outside of U.S.A. - retrieved 2022/02/23 original source: totousa.com/filemanager_uploads/product_assets/OwnersManual/0GU059_WT151_152M_IM_OM.pdf
Most modern flush toilets that use a water storage have a tank bolted to the toilet bowl or incorporate a tank and bowl in a one-piece-toilet design.
Also see BACK FLUSH & WALL MOUNT TOILETS - includes both in-wall flush tanks and two-piece toilets that incorporate toilet bowl and flush-tank.
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Citations & References
In addition to any citations in the article above, a full list is available on request.
- [2] 1991 ADA Standards for Accessible Design, U.S. Department of Justice, 28 CFR Part 36, Revised as of July 1, 1994, excerpts; web search 5/10/12, original source: http://www.ada.gov/stdspdf.htm [copy on file as ADA_Standards_1994.pdf]
- In addition to citations & references found in this article, see the research citations given at the end of the related articles found at our suggested
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