Tankless Geek topic guide

    Hard Water and Tankless Water Heaters

    Mineral scale can restrict flow and heat transfer, but treatment and service choices should follow measured water quality and the manufacturer manual.

    Updated

    Direct answer

    Test hardness, review the model's water-quality limits, install treatment where justified, and keep a service record. Do not assume a scale inhibitor is equivalent to a water softener.

    Measure before treating

    A laboratory or utility report provides a defensible starting point. Hardness, sediment and other chemistry can require different responses.

    Warranty conditions

    Some manufacturers exclude damage associated with water outside stated limits or missed maintenance. Read the current warranty before installation.

    Questions people ask

    Will a tankless heater remove hardness?

    No. A water heater does not soften water. Treatment is a separate system decision.