Takagi Capacity / Flow Limitation

Takagi water heater frequently shuts off when multiple fixtures are used at once.

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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

Total hot water demand exceeds heater capacity, Undersized gas line limiting BTU output, Flow adjustment valve limiting flow, Scale reducing heat transfer

How to Fix / Troubleshooting

Safety first: Avoid setting temperatures excessively high to compensate; this increases scald risk.

Steps:

  • 1. Compare demand to capacity: Check the Takagi model’s GPM rating at your incoming water temperature and compare to the number of fixtures used simultaneously.
  • 2. Stagger usage: Reduce the number of simultaneous hot water uses to stay within capacity.
  • 3. Descale unit: Perform a descaling flush to restore full heat transfer capability.
  • 4. Professional evaluation: Have a technician verify gas line sizing and pressure. In some cases, adding a second unit in cascade may be recommended.
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Repair Difficulty

Medium 3/5

Required Part

Flow Adjustment Valve
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