"SBH" wrote:

From what I understand, adding a tankless system in a new construction will
provide payback in savings.

Even that is doubtful. You have to add the increased cost of the unit itself,
the increased cost of installation (including larger electric or gas service),
and required annual maintenance. The operating costs for energy can be higher as
your rate is often dependent on the size of the service.

Storage tank heaters are far more efficient than people realize. There are
specific circumstances where demand heaters make sense, but economics aren't
usually the reason.