Stiebel Eltron
Progressive Scale Buildup / Efficiency Loss
Water heater performance has gradually declined over months or years; longer time to get hot water and lower maximum temperature.
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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
Hard water causing limescale on heat exchanger, Infrequent maintenance, High set temperatures accelerating scale formation, No water treatment system installed
How to Fix / Troubleshooting
Safety: Turn off power and close water supply before descaling.
- Descale heat exchanger: Connect a descaling pump and hoses to the heater’s service valves (if installed) and circulate a suitable descaling solution according to the service manual.
- Clean filters and aerators: Remove and clean inlet filters, faucet aerators, and showerheads to restore flow.
- Adjust setpoint: Lower the set temperature slightly to reduce future scale buildup.
- Consider water treatment: In hard water areas, install a water softener or scale reduction system upstream of the heater.
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Repair Difficulty
Medium
3/5
Required Part
Heat Exchanger
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