Should I drip hot or cold water?

When It Makes Sense

• Good fit: In freezing climates during winter, letting a faucet drip a small amount of cold water can keep water moving through the pipe and reduce the chance of it freezing.
• Good fit: When you need to clear mineral buildup or debris from a faucet aerator, a brief drip of hot water can help dissolve deposits before a full flow is resumed.

When You Should Avoid It

• Warning sign: If water and energy costs are a major concern, a continuous drip—especially of hot water—can waste resources and increase bills.
• Warning sign: In homes with children or pets, a hot‑water drip can pose a scalding risk, so you should pause or use temperature‑controlled devices.

Pros and Cons

Pros

• Provides a simple, low‑tech method to keep pipes from freezing during extreme cold.
• Helps dislodge sediment and mineral deposits that can clog aerators or showerheads.

Cons

• Wastes water and, if hot, consumes additional energy, leading to higher utility costs.
• Improper temperature control can create a scalding hazard or strain water‑heating equipment.

Decision Checklist

• Is the outdoor temperature regularly below the pipe’s freeze point?
• Do you have effective pipe insulation already installed?
• Can you afford the extra water and energy usage, or would a non‑drip alternative be more sustainable?

Alternatives to Consider

Instead of relying on a continuous drip, you can insulate vulnerable pipes, open cabinet doors to let warm air circulate, install pipe‑heating tape, or use a timed faucet valve that drips only during critical periods. For cleaning purposes, soak the aerator in vinegar rather than running hot water continuously.

Final Recommendation

For most homeowners dealing with freezing temperatures, a slow drip of cold water is the safest, most cost‑effective way to prevent pipe bursts. Use hot water drips only for targeted cleaning tasks, and always weigh water waste against the risk of damage. When in doubt, consult a plumber or a building‑maintenance professional, especially if you have complex piping or high‑risk conditions.