Do I Need to Run Hot Water with Cold to Prevent Frozen Pipes?

When facing the cold temperatures during winter, one common concern is whether running both hot and cold water simultaneously can help prevent frozen pipes. This misconception is prevalent, but the reality is a bit more complex. Let's break it down and explore the true reasons behind the prevention of frozen pipes.

Understanding the Science of Frost

Water freezes at 32°F (0°C) regardless of its source. The origin of the water's temperature does not prevent it from freezing if the surrounding temperature drops below this critical point. Even hot water in a pipe, if the flow ceases, can freeze due to the low ambient temperature.

Effective Methods for Preventing Frozen Pipes

Constant Dripping

A simple and effective method to prevent freezing is to let a small trickle of water from a faucet, whether hot or cold, flow continuously. This moving water will not freeze as it passes through the pipes, even if the surrounding temperature falls below 32°F (0°C).

While it’s true that a constant flow of water helps prevent freezing, it’s not a magic solution. The moving water needs to be above 32°F (0°C) for it to be effective. If the water exiting the faucet is below this temperature, it can still freeze, even if it’s in motion.

Using Both Hot and Cold Water

Using both hot and cold water simultaneously can be helpful in some scenarios. For instance, if hot and cold water pipes are running close to each other in an unheated space, such as an outer hollow wall, the heat from the hot water can help keep the cold water from freezing. However, this method is not universally applicable.

Pressure and Ice Buildup

The misconception that running water prevents freezing is partly due to the belief that moving water cannot freeze. While movement does help, the more critical factor is the pressure buildup within the pipes. A constant drip helps relieve the pressure buildup that can occur between an ice blockage and the faucet. This relief in pressure helps to prevent the pipes from bursting when the ice begins to thaw.

Additional Tips for Protecting Pipes

While dripping water can be effective, there are several other methods you can employ to prevent frozen pipes:

Insulate Pipes: Wrap exposed pipes with insulation or heat tape to keep the water warm. Close Valves: Close valves leading to outdoor faucets and open the faucets to drain the remaining water. Seal Gaps: Seal any gaps in the walls or attics to prevent heat loss. Heat Tracing: Use heat tracing systems in unheated areas to provide continuous heat to the pipes.

By taking these proactive measures, you can significantly reduce the risk of frozen pipes and save yourself from costly repairs when the temperature drops.

Conclusion

In summary, while running a constant drip of water, whether hot or cold, can help prevent pipes from bursting, it’s not the only or the most efficient method. Understanding the principles of frost prevention and employing additional strategies will ensure your plumbing stays safe and functional throughout the winter.