They click a lot trying to keep up with demand.
The necessary elec. supply for these is very large. 3 GPM of 120°F water from 50 °F incoming water takes 30 kw, if I didn't make a arith. error.
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With baths it's not bad but with showers you will get cold water on your head occasionally.
A tank heater may lose 50w all the time.
Tankless installed prices in kilobucks
$1.0
$1.0
$1.5
$1.6
$1.7
$1.8
$2.0
$2.0
$2.0
$2.2
$2.3
$2.5
$2.6
$2.7
$2.8
$3.0
$3.1
$4.0
$2.2 =avg
$2.1 =median
half between 1.7 and 2.7
My search terms:
tankless water heater quote price install