Bradford White Water Heater Dip Tube Replacement - Signs & How-To

Bradford White Water Heater Dip Tube Replacement — What This Part Does

The dip tube is a long plastic pipe inside your Bradford White water heater that connects to the cold water inlet at the top. It directs incoming cold water all the way down to the bottom of the tank so the burner or heating element can heat it properly. Without it, cold water mixes at the top where your hot water exits, so you get lukewarm water and the tank never fully heats.

Dip tubes fail from age, heat exposure, and mineral buildup from hard water. Bradford White and many other brands installed defective polypropylene dip tubes between roughly 1993 and 1997 that are known to crack, disintegrate, and shed white plastic fragments into your water. Over time, even newer tubes can crack, deform, or clog from scale. Once the tube is damaged, cold water short-circuits the heating cycle and you lose hot water capacity.

Jump to Replacement Steps

Signs It Needs Replacing

• Hot water runs out fast Your showers turn cold after just a few minutes even though the heater worked fine before.
• Water feels only warm, never hot The hottest tap water you can get is lukewarm because cold inlet water is mixing at the top instead of heating at the bottom.
• White plastic bits in the water You see small white or off-white plastic particles in sink aerators, showerheads, or the bottom of the tank during draining.
• Heater makes popping, rumbling, or banging sounds Unusual noises from the tank can signal debris, blockage, or disrupted water flow from a broken dip tube.
• Unit was made between 1993 and 1997 Water heaters from that era often had factory dip tubes made from defective material prone to breakdown.
• Visible cracks or deformation during inspection If you remove the inlet nipple and see cracks, holes, or other damage on the dip tube, it cannot be repaired and must be replaced.

How to Replace It

1. Turn the gas control knob to OFF on gas models, or shut off power at the breaker for electric models.
2. Close the cold water shutoff valve feeding the water heater.
3. Attach a garden hose to the drain valve at the bottom of the tank and run it to a floor drain or outside.
4. Open a hot water faucet somewhere in the house to let air into the system and help the tank drain.
5. Open the drain valve and let the tank drain until the water level drops below the cold water inlet connection at the top.
6. Use a pipe wrench to disconnect the cold water supply line from the inlet nipple on top of the heater.
7. Unscrew and remove the inlet nipple/dip tube assembly from the tank using a pipe wrench, being careful not to strip the threads or drop debris into the tank.
8. Install the new inlet nipple/dip tube by applying pipe dope to the threads and threading it into the tank opening, then tighten securely with the wrench.
9. Reconnect the cold water supply line to the new inlet nipple, close the drain valve, remove the hose, and turn the cold water back on to refill the tank while leaving a hot faucet open to bleed air.
10. Once the tank is full and water flows steadily from the open faucet, close the faucet, restore power or relight the pilot, and flush the system at a few faucets to clear any remaining debris.

The Part You Need

When to Call a Pro

If your water heater is still under warranty, or if you are uncomfortable draining the tank and working with threaded pipe connections, call a licensed plumber or water heater technician. If you own a gas model and smell gas at any point, leave the area immediately and call your gas utility or a professional. Technicians can also flush the entire system thoroughly after replacement to remove plastic debris that may have traveled into your home’s plumbing, and they can inspect for any related damage to valves, the tank lining, or other components. For gas line, burner, or igniter work, or if you ever smell gas, stop and call a licensed technician.