Horow offers 7 4-inch flush valve toilets models in the lineup we track. This page is the Horow-specific cut of the broader 4-inch Flush Valve Toilets (Champion 4 et al.) toilets category — same product class, narrowed to the Horow catalog only.
Horow markets smart toilets directly to US consumers through Amazon, Wayfair, and its own storefront, undercutting TOTO Neorest and Kohler Numi by 50–70% on similar feature sets — auto open/close lid, heated seat, foot-sensor flush, integrated bidet wash with adjustable temperature, and tankless siphonic flush as low as 0.8 GPF. The HWMT-8733 and HR-T17Y models are the volume sellers. Quality and warranty consistency lags the Japanese brands, but the value proposition is real for shoppers under $1,500.
For the complete Horow lineup across all sub-types and capacities, see the Horow Toilets hub.
If you're cross-shopping 4-inch flush valve toilets beyond Horow, the following brands also ship in this category:
A 4-inch flush valve is the largest flush valve sold in US residential toilets. The standard residential flush valve is 2-inch or 3-inch; 4-inch is the rare premium specification, found primarily on the American Standard Champion 4 line. The larger valve moves water from the tank to the bowl at much higher velocity than a 2"-3" valve, which means stronger flush performance at the same GPF.
Flush velocity = (tank water volume × valve diameter) / time. A bigger valve = more velocity per gallon of water. For a 1.28 GPF toilet:
The 4-inch valve dumps the entire 1....
For the complete 4-inch flush valve buyer's guide (all brands, full comparison framework), see the 4-inch Flush Valve Toilets (Champion 4 et al.) category hub.
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