Bradford White Thermal Expansion in a Closed System

Bradford White water heater frequently drips from the T&P discharge only when the burner or heating elements are active.

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.

Possible Causes

No thermal expansion tank installed, failed or waterlogged expansion tank, high incoming water pressure, check valve or PRV creating a closed system.

Safety: Do not cap the T&P discharge. It is a safety relief device.

Steps:

Check for an 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 pre-charged.
Check PRV: If you have a pressure-reducing valve (PRV), verify it is functioning correctly and not causing excessive pressure.

Persistent expansion issues should be evaluated by a plumber to protect both the heater and the plumbing system.

Medium 3/5

Thermal Expansion Tank

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