Reference · Glossary
The BidetVerdict glossary
The short version
Bidet listings run on vocabulary that manufacturers define loosely or not at all, and a term misunderstood at purchase time becomes a return in week one. Every definition below is the sense in which this desk uses the word across its verdicts and guides — mechanism first, marketing last. Terms are alphabetical; brand coinages are marked as such and defined by what the hardware does, not by what the brochure hopes.
| Term | What it means |
|---|---|
| Aerated wash | A stream with air drawn into the water before the nozzle. The mixed stream feels fuller and can clean effectively at lower pressure than a solid jet — which is why aeration earns credit under wash performance in our rubric. |
| ASSE | The American Society of Sanitary Engineering, whose standards (notably for backflow prevention in plumbing fixtures) appear in certification listings for bidet seats and integrated toilets. An ASSE reference is a compliance claim, checkable in certification directories — Class B evidence here. |
| Compact elongated | A bowl/seat shape that keeps an elongated front profile in roughly the front-to-back footprint of a round bowl. Relevant because seat fit follows bowl shape: measure per the sizing guide rather than trusting the label. |
| EWATER+ | TOTO's coinage for electrolysed water used to rinse the nozzle wand (and, on some models, mist the bowl). The electrolysis produces a mildly acidic, sanitising solution from ordinary tap water. Defined by mechanism: it is a nozzle-hygiene system, scored under hygiene where fitted. |
| French curve | A toilet tank/bowl profile in which the tank curves continuously into the bowl with a concave sweep, leaving too little flat mounting surface — and too little clearance — for many bidet seats. A named fit exclusion in the sizing guide; check for it before ordering, not during install. |
| GFCI | Ground-fault circuit interrupter: the outlet type with test/reset buttons that cuts power on a ground fault. Electric bidet seats require a GFCI-protected outlet within cord reach — typically about four feet — and its absence is a priced line item in the installation ledger. |
| Guard gate | A small shield or shutter that covers the retracted nozzle when idle, limiting splash-back contact. Part of the nozzle-hygiene picture alongside retraction and self-cleaning; see Guide G-35. |
| Hybrid heating | A water-heating architecture combining a small reservoir with on-demand heating: warm water immediately, sustained longer than a plain tank, without the full current draw of a pure tankless system. One of the three architectures compared in electric vs. non-electric. |
| MaP score | Maximum Performance testing: a standardised North American toilet-flush test that rates how much simulated waste a toilet clears in a single flush, reported in grams. It scores the toilet, not a bidet seat — relevant when choosing an integrated smart toilet or a replacement toilet to carry a seat. |
| Oscillation | A wash mode in which the nozzle moves back and forth automatically, spreading the stream over an area instead of holding one point. Contrasts with manual repositioning and with pulsation; the two are often combined and just as often confused in listings. |
| PREMIST | TOTO's coinage for a system that mists the bowl surface with water before use, so waste adheres less to a pre-wetted ceramic surface. A bowl-cleanliness feature, not a wash feature — noted in the beginners' guide as the category's one genuine bowl-cleaning exception. |
| Pulsation | A wash mode that varies stream pressure in a rapid rhythm. Sold variously as massage; defined mechanically, it is pressure modulation. On tender tissue, pulsation's peaks obey the same pressure discipline as any setting — see Guide G-05. |
| Sittable lid | A lid rated for an adult's weight when closed — safe to sit on for dressing, nail care, or bathing a child. Not all seat lids are; the rating is a manufacturer specification, and an unrated lid is a surface, not a seat. |
| Skirted | A toilet design whose smooth sides conceal the trapway and, usually, the seat-bolt access — the sleek profile that creates the top-mount problem solved in Guide G-39. |
| T-valve | The tee fitting that splits a toilet's supply line between tank and bidet. The desk's standing advice: metal, and with a positive shutoff lever, so the bidet line can be isolated without shutting down the toilet. |
| Tank heating | A heating architecture storing a small reservoir of warm water inside the seat. Warm instantly, finite in volume: a long wash can outrun it and cool toward the end. |
| Tankless heating | Instant, on-demand heating as water flows — no reservoir, no volume limit, and a heavy electrical draw at the moment of use. In very cold supply conditions its achievable temperature rise is the ceiling discussed in Guide G-41. |
| Top-mount | Seat hardware that anchors from above the bowl, for skirted and one-piece toilets whose bolt undersides cannot be reached. Maker-specific kits outrank generic ones where both exist. |
| Vacuum breaker | A backflow-prevention device that admits air to break a siphon, keeping any contaminated water from being drawn back toward the supply. Its presence in a seat or sprayer installation is a code-and-safety item, verified in certification listings rather than in marketing copy. |
| Vortex / enema mode | A high-pressure, narrowly focused stream mode, marketed under names including “vortex” and “turbo,” intended to assist bowel movement with water pressure. The mode with the strongest cautions in the clinical literature this desk cites; examined in Guide G-10 and never a default recommendation. |
How to use this glossary against a listing
When a product page uses a term above as an adjective — “EWATER+ clean,” “vortex power,” “spa pulsation” — translate it back into the mechanism in its definition and ask what the mechanism does for the scored criteria: wash, hygiene, comfort, build, cost, controls. A term that survives translation is a feature. A term that evaporates was decoration. Brand coinages in particular (PREMIST, EWATER+) name real mechanisms owned by one maker; equivalent functions at other makers travel under other names, and the desk scores the function.
Sources & evidence
Definitions are drawn from manufacturer spec sheets and manuals (for brand coinages and product mechanisms), from the standards and testing bodies named in the entries (ASSE, the MaP testing programme) in general terms, and from plumbing and electrical trade usage for parts terms. Where a word's meaning differs between a maker's usage and this desk's, the definition gives the desk's usage and says so — consistency across verdicts is the glossary's entire purpose. Corrections to a definition follow the same policy as corrections to a verdict: amended in place, with the change noted.
The translation rule
Every glossary term on this page reduces to a mechanism a plumber or an electrician would recognise. Hold listings to the same standard and the category's vocabulary shrinks to its real size in about ten minutes.