Stiebel Eltron
Hydraulic Shock / Water Hammer
Water heater operates but causes noticeable water hammer or banging noises in the plumbing when turning on or off.
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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
Fast-acting solenoid or flow control valves, High static water pressure, Lack of water hammer arrestors, Long runs of rigid piping without cushioning
How to Fix / Troubleshooting
Safety: Turn off power and water if modifying plumbing. Use proper tools and follow plumbing codes.
- Check pressure: Measure static water pressure. If above recommended levels (typically 80 psi / 5.5 bar), install or adjust a pressure reducing valve.
- Install hammer arrestors: Add water hammer arrestors near the heater or at problem fixtures to absorb shock.
- Secure piping: Ensure pipes are properly clipped and supported to reduce movement.
- Consult plumber: Persistent water hammer may require a licensed plumber to redesign sections of the plumbing system.
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Repair Difficulty
Medium
3/5
Required Part
External Plumbing / Water Hammer Arrestor
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