Do I need to install a water softener for my tankless unit and how resistant is one of your tankless water heaters to hard water?
No. It is not required to install a water softener, but it is necessary to filter the incoming cold water line to ensure that sediment and/or debris particulate do not enter your heater. If you do live in an area that has very hard water it will eventually harm the performance of your tankless water heater. Something you can do is to add a water pre-filter which reduces scale which over long periods of time can form inside the heater’s internal piping. A water softener system (non-reverse osmosis type) works well and many homes already have this. Additionally as with tank-type heaters, all tankless manufacturers recommend that you do a routine flush maintenance of your tankless heater (frequency depends on your water hardness level). There are ways in which you can tell if you have hard water. You may contact your city’s water department for their water test report, test your water by purchasing a water hardness kit (fairly inexpensive), or by simply looking at your water fixtures to s
