Dip Tube
Definition and meaning of Dip Tube in real estate.
A dip tube is a plastic pipe located inside a hot water heater that directs incoming cold water straight to the bottom of the tank near the heating element.
In more detail
By delivering cold water to the bottom of the tank, the dip tube prevents it from mixing with and cooling down the hot water floating at the top of the tank. If a dip tube cracks, breaks, or degrades, cold water will mix directly with the hot water near the top outlet.
This issue typically results in a home's hot water supply running out much faster than normal or failing to get sufficiently hot. Inspecting the dip tube is a standard step during water heater troubleshooting when a home inspection reveals temperature issues.
Key facts
| Category | Property Types & Construction |
|---|---|
| Location | Inside the water heater storage tank |
| Function | Routes cold water to the bottom of the tank |
| Common failure sign | Hot water running out prematurely |
A homeowner notices their shower water turns cold after only a few minutes and hires a plumber, who discovers the water heater's plastic dip tube has cracked and needs replacement.
Frequently asked questions
How do I know if my dip tube is broken?
The most common sign is a sudden shortage of hot water, or finding small flecks of white plastic clogging your faucet aerators, which indicates a disintegrating tube.
Can you replace a dip tube without replacing the water heater?
Yes, a plumber can easily replace a broken dip tube, which is a cheap repair compared to the cost of purchasing a new water heater.
Why does the cold water need to go to the bottom?
Hot water naturally rises to the top of the tank, so introducing cold water at the bottom keeps the hot water separate and allows the heating element to warm the cold water efficiently.