nearly all reports from tankless owners are negative, open a kitchen
faucet a little no hot water ever.....

it appears some peoples usage patterns fit a tankless.

in so far as rental units, the added costs for gas lines etc must wipe
out any energy savings for many years.

beyond which during the winter a standard hot water tanks heat loss
helps heat your home........

of course during a power failure the ONLY showers a tankless owner gets
is a cold one, unless it has a battery backup......

With the current terrorism issues a tank type heater is a excellent
source of emergency drinking water