all I know is that the shorter the toilet.. the more comfy it is for me; I have a 14.5 inch, and it is a perfect height; the other bathroom has a high 17.5 inch ADA.. and it's not comfortable to go to the bathroom in
According to the warranty sheet that came with the toilet, "This toilet comes with a limited lifetime warranty on chinaware, a limited 5 year warranty on all mechanical parts of the toilet, and a limited 1 year warranty on the toilet seat if included with product."
To put it into simple terms from a layman's perspective, the flush water doesn't enter the bowl then spin slowly before draining out as is typical with most American toilets. With this toilet, the water enters the bowl simultaneously with the waste being siphoned or sucked gently out with the flush. No spinning, no real difference in bowl fullness, very little noise in fact. There are two buttons on the top of the toilet reservoir. One is a half flush for liquids, the other a full flush for solids. Hence the 'dual flush'. An Australian invention, it helps conserve water. We are delighted with these toilets.