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We're looking to replace our old, cracked V&B Omnia Classic toilets with https://www.villeroy-boch.co.uk/bw/m/O.novo-Washdown-WC,-rimless--5660R0.html . The measurements of the important bits line up. Our old ones are not rimless, but these are. On the product page, it mentions:

DirectFlush. Sanitary porcelain. Also available in CeramicPlus. not suitable for installation with flush valves.

Does anybody know what "not suitable for installation with flush valves" means?

For what it's worth, our flush consists of:

https://www.amazon.co.uk/gp/product/B00505EFFG/ref=oh_aui_detailpage_o04_s01?ie=UTF8&psc=1 for the cistern

and

https://www.amazon.co.uk/gp/product/B0017VGWEO/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1 for the flush panel.

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    I believe that means the commercial flush valves such as the kind you find in airport restrooms for tankless toilets – Alaska Man Nov 11 '18 at 21:56
  • Another website shows the items as "not suitable to install with a flushometer". Looks like you're right. I'll call V&B in the morning to confirm. – ashic Nov 11 '18 at 23:50
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So called V&B. The guy "simplified" the description, and stated that it's kind of been lost in translation; a lot of links on the English site even go to the German one. What not suitable for installation with flush valves means is that a cistern must be used that has a push button flush. He mentioned requiring high pressure, but that other flushing mechanisms using levers, direct mains, etc. will not work.

I mentioned our cistern does 3 / 6L for dual flush, and he mentioned that the installer can dial down the full flush to 4.5L, as that's all the Direct Flush systems need. A 6L shouldn't cause an issue as the V&B rimless flushes have a flat "rim" (well, they call it a ledge) that prevents splashing, and since water is released along the sides of the rim, extra water would merely be waste. Still recommended dialing it down to prevent water wastage.

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