Timers work in a different way.
It basically takes the same amount of energy to heat X number of gallons quickly, but at various times of the day, using the tankless systems... as it does to heat the same number of gallons slowly using the tank systems.
The tanks systems must maintain the temp through extra standby usage; but if used all at once the difference between tank and tankless would be meaningless.
The tankless version just allows more flexibility in the timing of the use.
While the timer tank version has to be used when ready and not allowed to set.
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