Scale is the #1 hidden killer of water heaters. About 85% of US homes have hard water, and as those minerals heat up they bake onto your heater as rock-hard scale. Just a ¼ inch of scale cuts heating efficiency 25–40% — raising your energy bill, triggering tankless error codes, and shortening the unit's life by years. It happens to every kind of water heater: solar, tankless, tank, commercial, and industrial.

Protect your water heater — pick your setup

Salt-free conditioners reduce and help prevent new water-heater scale; they are not softeners and do not remove existing hardness. Free U.S. shipping. See our hard water guide.