If you have hard water DON'T BUY EcoSmart tankless water heater without reading.

I purchased Ecosmart 11 electric tankless heater in 2013 and it has been replaced 4 times because their instructions do not mention the problems involved maintenance and prevention of scale buildup. You cannot just rinse off the screen once per year as per their old instructions. You also must flush this system with white vinegar several times per year, and that requires the installation of a service valve kit. I also advise using a whole house filter with a scale inhibitor and replacing it whenever you flush out the tankless heater.

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