Toto spares, Toto parts, Toto spare parts, spare code no : WH074M - WH076M - Concealed tank w-o frame,
- The TOTO Chennai / parts listing mentions WH074M / WH076M as “Concealed Tank W/O Frame (4.8/3L) / (6/3L)” bechennai.com
- “W/O Frame” means “without frame” — i.e. the cistern / flush tank is concealed in wall / structure without requiring a supporting metal frame or carrier.
- The volumes 4.8/3L and 6/3L indicate dual flush capacities — large/low flush (e.g. 4.8 L for full flush, 3 L for partial) or 6/3 L variant for higher capacity models.
So WH074M is probably the 4.8/3 L version and WH076M the 6/3 L version (or vice versa, depending on regional codes) of TOTO’s in-wall flush cistern units that do not require a supporting frame.
What “concealed tank without frame” means
- A concealed tank (or cistern) is mounted inside the wall, within a cavity, so that only the flush actuator (e.g. push plate) is visible externally.
- Without frame means the tank is installed directly into a wall cavity or masonry, rather than being supported on a structural frame (steel or other carrier) that braces it independently of the wall.
- So the structural “carrying / load bearing” support must come from the surrounding wall / construction, rather than an independent frame.
Advantages of concealed tank without frame (like WH074M / WH076M)
Using a concealed cistern without a frame offers several potential benefits (and some tradeoffs). Here are the advantages:
AdvantageDetails / Why beneficialCleaner look / minimal visible hardwareSince the tank is hidden inside the wall, the bathroom has a sleek, minimalist aesthetic — only the flush plate is visible.Space saving / compact designWithout a frame occupying space, the installation may allow for thinner walls or narrower cavities.Cost saving (less hardware)Not requiring a metal support frame or carrier can reduce material and installation cost (though may raise requirements on wall strength).Flexibility in placementWithout rigid frame constraints, the toilet / bowl positioning may have more freedom (within structural limits).Reduced maintenance on frameNo metal frame components to corrode or require maintenance.Simplified installation in masonry / concreteIn solid walls / masonry construction, embedding the tank directly may be simpler than building a supporting frame.Dual flush capabilityThe models WH074M / WH076M come with dual flush (e.g. 4.8/3L or 6/3L) which saves water on partial flushes (for liquid waste) rather than using full flush always.
Things to watch out / considerations / tradeoffs
While there are advantages, concealed tanks without frame do pose some challenges:
- Wall strength / structural requirements
- Because there is no independent frame, the wall cavity / structure must be strong enough to support the tank, plumbing loads, and stresses without sagging or shifting.
- Access / serviceability
- If a repair is needed (e.g. flush valve, inlet valve, leak), accessing the tank is more constrained. The flush plate / access panel must permit servicing. Poor access design can make repairs difficult.
- Installation precision
- The tank must be aligned precisely during wall finishing (plastering, tiling) so that the flush plate and outlet align correctly. Errors in roughing can lead to misalignment.
- Water proofing / wall protection
- Because the tank is embedded, any inevitable condensation or small leakage must be managed carefully (via waterproofing, drainage behind the wall) to avoid wall damage.
- Limited flexibility in future retrofits
- If plumbing or layout need changes later, the concealed tank location is less flexible compared to exposed or framed installations.
- Cost / complexity in some cases
- Though frame cost is saved, more care in construction, wall finishing, waterproofing, and access design may add labor cost or complexity.
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