To protect an outdoor or uninsulated indoor tankless water heater from freezing and bursting during freezing winter weather, you must install electric anti-freeze pipe heating cables, wrap external water supply lines in thick foam insulation, and utilize built-in electric freeze protection heaters if equipped. If freezing temperatures are severe and power fails, completely drain all water from the unit using the isolation valves. Verification: Inspect insulation blankets and verify that built-in freeze protection circuits are actively powered during winter storms.
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