The Hidealoo is a space-saving, disappearing toilet that lives inside of a cabinet, and is only meant to be seen while in use:
It was invented by British design engineer Monty Ravenscroft, whose father's health issues required installing a toilet in his bedroom; Ravenscroft, who's spent 25 years devising design and engineering solutions for architecture firms, wanted to maintain the dignity of his father's bedroom while providing toilet facilities on-demand.
Realizing the larger potential market for his invention, Ravenscroft subsequently teamed up with designer Sebastian Conran, formed Hidealoo the company, and secured a £160,000 (USD $199,380) investment from the British Design Fund, a startup incubator, to bring the product to market.
The Hidealoo's steel structure can support up to 400kg (882 pounds), making it more than sturdy enough to support a person, a toilet and the water within it. The flexible waste pipe has been tested for 250,000 opening/closing cycles, meaning it would last for at least 45 years—even if you used the toilet 15 times a day.
I assume that installing one in a retrofit, as opposed to new construction, would require redesigning your bathroom around where the existing toilet main is; I don't have much plumbing experience but assume that's not a trivial thing to move. That aside, "Any competent DIYer or professional plumber can install Hidealoo in just a few hours," the company says. "It fits any standard wall -hung pan and cistern and comes with fittings to couple to the UK standard mains waste pipe."
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If you're curious, you can see some installation case studies here.
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