Quora User' answer is excellent, but the maintenance of said toilet is also an issue. Most residential homeowners want to be able to maintain their own fixtures without tearing up the wall or the floor. Tanks allow this. Flush valves; either wall or floor mounted; do not. read more
Isaac Gaetz has it right. Typically, that type of toilet takes a 1" supply where the average residential toilet requires a 1/2" supply with most being connected to the house plumbing by a 3/8" supply tube. read more
• If you are constructing a new home or the plumbing used in the current building can support a tankless toilet, and you have a reliable electric supply, you should use the tankless toilet. • The huge cost of the tankless toilets might also put you off because their cost ranges from $1000 to $5000. read more