Stiebel Eltron
Freeze Damage / Inadequate Frost Protection
Water heater installed in a cold area occasionally freezes or shows signs of frost damage (cracked components).
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Unit installed in unheated space below minimum temperature, No drain-down during freezing conditions, Insufficient insulation on pipes, Power outages disabling any built-in frost protection
How to Fix / Troubleshooting
Safety: Turn off power and water if freeze damage is suspected. Do not energize a frozen unit.
- Inspect for cracks: Check the heat exchanger and plastic components for visible cracks or leaks once thawed.
- Drain unit: If freezing is expected, follow the manual to drain the heater completely and isolate it from the water supply.
- Improve insulation: Insulate pipes and, if possible, the installation area to maintain temperature above freezing.
- Replace damaged parts: Any cracked heat exchanger or fittings must be replaced before the unit is used again.
- Professional service: Significant freeze damage often requires extensive repairs or replacement of the heater.
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Repair Difficulty
Professional Required
5/5
Required Part
Heat Exchanger / Internal Plastic Fittings
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