Bradford White
Thermal Expansion in Closed System
Bradford White water heater frequently drips from the T&P discharge only when the burner or elements are heating.
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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
No thermal expansion tank installed, Failed or waterlogged expansion tank, High incoming water pressure, Check valve or PRV creating closed system
How to Fix / Troubleshooting
Safety: Do not cap the T&P discharge. It is a safety relief.
Steps:
- Check for expansion tank: Look on the cold inlet line for a small tank. If present, tap it; if it sounds full of water, it may be waterlogged.
- Test pressure: Use a pressure gauge to monitor system pressure while the heater runs. If pressure spikes significantly, install or replace the expansion tank and ensure it is properly precharged.
- Check PRV: If you have a pressure-reducing valve, verify it is functioning and not causing excessive pressure.
Persistent expansion issues should be evaluated by a plumber to protect both the heater and plumbing system.
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Repair Difficulty
Medium
3/5
Required Part
Thermal Expansion Tank
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