Since tankless water heaters do not store hot water, minerals have less
of an opportunity to settle out of the water column and build up inside
the heat exchanger. Additionally, the flow of hot water through the
coiled heat exchanger flushes the product each time hot water is used.
The use of a water softener is fine with a tankless water heater, and
is recommended if you commonly experience hard water problems in your
home.
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