They can be 8 14 more energy efficient for homes that use a lot of hot water around 86 gallons per day.
On demand water heater vs tank.
Installation repair and maintenance of water heaters.
Tankless water heater parts are can also be relatively cheaper than their storage tank counterparts.
Tankless water heaters.
Tank type water heaters are generally easier to install.
On the other hand tankless water heaters are known to last longer than tank type water heaters.
This energy star certified titan of a tank delivers up to 72 gallons of hot water per hour dependent on tank capacity which is a rate much faster than the normal electric water heater.
For homes that use 41 gallons or less of hot water daily demand water heaters can be 24 34 more energy efficient than conventional storage tank water heaters.
If you use lots of hot water daily around 86 gallons you might enjoy energy efficiency of an additional 8 to 14 percent.
Rather than constantly maintaining a standby supply of hot water they heat water on demand as o brian puts it.