Bosch Condensation / Moisture Intrusion

Bosch water heater shows condensation or water droplets on or inside the casing

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Possible Causes

Cold water lines sweating, Inadequate insulation on pipes, Improper condensate drainage (condensing models), High humidity in installation area

How to Fix / Troubleshooting

Safety first: Turn OFF power before working near electrical components. Moisture can cause corrosion and shorts.

  • Identify source: Determine if moisture is from pipe condensation, condensate system, or external leaks.
  • Insulate pipes: Wrap cold water lines with foam insulation to reduce sweating.
  • Check condensate system: On condensing models, ensure the condensate trap and drain line are clear and properly sloped.
  • Improve ventilation: Increase airflow in the installation area to reduce humidity. Use a dehumidifier if necessary.
  • Protect electronics: If moisture has reached the control board or wiring, have a technician inspect for corrosion and damage.
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Repair Difficulty

Easy 2/5

Required Part

Condensate Trap Assembly
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