Lochinvar Insufficient Heating / Capacity or Control Issue

Water not hot enough from Lochinvar water heater; runs out of hot water quickly.

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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

Thermostat set too low, Failed heating element (electric models), Partially clogged burner orifice, Broken dip tube in tank

How to Fix / Troubleshooting

Safety: Turn off power at the breaker (electric) or set gas control to OFF (gas) before servicing. Water may be hot.

Steps:

  • 1. Check thermostat setting: Increase the setpoint slightly (e.g., from 110°F to 120°F) and test again after recovery.
  • 2. Electric models – test elements: With power off, remove access covers and test each heating element for continuity and proper resistance. Replace any open element with a Lochinvar-rated element.
  • 3. Gas models – inspect burner: Clean burner ports and orifices to ensure full flame coverage. Verify proper gas pressure.
  • 4. Check dip tube: If cold water seems to mix quickly with hot, remove the cold inlet nipple and inspect the dip tube. Replace if broken or missing.
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Repair Difficulty

Medium 3/5

Required Part

Heating Element
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