This question has popped up numerous times, not because people really doubt that wall hung toilets with concealed cisterns are bad, but because they are given bad advice from lazy and inept installers.  Yes I am being quite direct here. Installing a concealed cistern from either Geberit or Grohe takes a little more effort since you have to at least look (not read, just pictures in the manuals) at a manual compared to closed couple toilets which are just plonked down, cemented in (wrong method -.-) and send the invoice.

Concealed cisterns are installed throughout most commercial office buildings, hotels and upmarket homes. So why should a concealed cistern with either a wall hung pan or back to wall pan not be a good option.  Geberit and Grohe are two of the largest concealed cistern manufacturers in the world, so you cannot go wrong.

There have been complaints of leaking systems, but that is not due to the product itself, that is because the fittings were not connected correctly which can happen to any toilet, stainless steel or closed couple. If there is a problem with the cistern mechanism, both manufacturers let you remove the complete mechanism from the actuator plate and replace it with a new one.

One of the weirdest remarks from an installer to a home owner was that concealed cisterns are illegal in South Africa…bollocks. You find them everywhere.