Bradford White Water Heater Drain Valve Replacement - Signs & How-To

Bradford White Water Heater Drain Valve Replacement — What This Part Does

The drain valve sits at the bottom of your Bradford White water heater tank and lets you drain or flush sediment during maintenance. It’s a brass service valve you attach a garden hose to when you need to empty the tank for service, winterizing, or flushing mineral buildup. Over time, sediment inside the tank restricts flow through the valve, and mineral deposits or internal wear cause the valve to leak, stick, or fail to seal completely. Old plastic or corroded valves are especially prone to dripping and poor shutoff. Bradford White uses a brass OEM drain valve on their units, and the manufacturer recommends full tank draining and valve replacement when the valve no longer operates correctly or holds a seal.

Jump to Replacement Steps

Signs It Needs Replacing

• Constant drip or stream from the closed valve Water leaks from the drain valve handle or spout even when you turn it fully closed, indicating worn internal seals or corrosion preventing proper shutoff.
• Valve handle won’t turn or feels stuck Mineral scaling or corrosion inside the valve body makes the handle difficult to open or close, especially if the valve hasn’t been used in years.
• Slow or no water flow when open Sediment buildup clogs the valve opening so water barely trickles out when you try to drain the tank, making flushing impossible.
• Visible rust or corrosion on the valve body Brown or green deposits around the threads or handle show the valve is corroding and will likely fail or leak soon.
• Valve snaps off or breaks when you try to open it Plastic or old brass valves crack or shear at the threads or handle under normal use, requiring immediate replacement.
• Water puddles under the heater near the drain valve A small pool of water appears below the drain valve, even when it’s closed, pointing to a failed seal or cracked valve body.

How to Replace It

1. Turn off electric power at the circuit breaker for electric models, or turn the gas control knob to pilot on gas units.
2. Shut off the cold-water inlet valve at the top of the water heater.
3. Attach a garden hose to the existing drain valve and run it to a floor drain, sump, or outside.
4. Open a hot water faucet somewhere in the house to break the vacuum and speed draining.
5. Open the drain valve fully and let the tank drain completely to remove all water and sediment.
6. Close the drain valve, disconnect the hose, and use a pipe wrench or adjustable wrench to unthread the old valve counterclockwise from the tank fitting.
7. Wrap the threads of the new Bradford White brass drain valve with two to three turns of Teflon tape in a clockwise direction.
8. Thread the new valve into the tank opening by hand, then snug it with a wrench (do not overtighten or you may crack the tank fitting).
9. Close all open faucets, open the cold-water inlet valve slowly to refill the tank, and purge air from hot taps until water runs steady.
10. Restore electric power or turn the gas control back to on, and check the new valve for leaks after the tank is full.

The Part You Need

When to Call a Pro

If you’re not comfortable shutting off gas controls or draining a full tank, call a licensed plumber or water heater technician. Gas models require careful handling of the gas control and pilot system. If your tank is very old, corroded threads in the tank opening may strip or crack during valve removal, which can mean tank replacement. A pro can also inspect the anode rod and pressure-relief valve while the tank is drained, catching other problems before they turn into leaks or failures. For gas line, burner, or igniter work, or if you ever smell gas, stop and call a licensed technician.