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PVC or plastic pipes can warp or crack
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Boiling water reaches temperatures above 212°F (100°C). Many common drain pipes made from PVC (polyvinyl chloride) are rated for lower temperatures and may become soft, brittle, or even warped over time.
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Grease solidifies further down the line
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While hot water might melt grease temporarily, it often pushes the fat deeper into the pipes, where it cools, hardens, and causes stubborn clogs.
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Metal pipes can suffer from seal damage
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Older metal piping systems often use rubber seals or joints, which may deteriorate or weaken due to repeated exposure to extreme heat.
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It doesn’t actually clean your pipes
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Contrary to popular belief, boiling water won’t remove built-up grime or fix clogs on its own — and it could worsen the issue by shifting blockages instead of dissolving them.
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« Preparation » (Safer Alternatives to Maintain a Healthy Drain)
If you want to clean or deodorize your sink and drains without risking damage, try these steps instead:
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Use warm (not boiling) water with dish soap to flush your sink regularly.
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Once a week, pour ½ cup baking soda, followed by 1 cup vinegar down the drain. Let it fizz, then flush with warm water.
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Install a drain catcher to prevent food and debris buildup.
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For greasy pans, wipe out excess fat with paper towels before washing.
« Serving and Storage Tips » (Best Practices for Sink and Pipe Care)
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Let hot water cool slightly before pouring it into the sink. Aim for warm or hot — not boiling.
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Use a grease jar or container to collect fats, oils, and lard — don’t send them down the drain.
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If using a garbage disposal, always run cold water during use to help fats solidify and be chopped more efficiently.
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Schedule a professional drain cleaning every 1–2 years to keep your plumbing in peak condition.
« Variants » (What You Can Pour Down the Drain — and What You Shouldn’t)
Safe to pour:
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Warm, soapy water
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Diluted vinegar and baking soda
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Lemon juice and ice cubes (for garbage disposal freshness)
Avoid pouring:
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Boiling water
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Oil, grease, butter
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Coffee grounds
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Eggshells or pasta
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Harsh chemical cleaners (they can damage pipes and are unsafe for septic systems)
FAQ
Q: Is boiling water safe for unclogging drains?
A: In metal-only systems, it might be okay occasionally — but in homes with PVC or mixed piping, it can lead to long-term damage. Use enzymatic drain cleaners or baking soda/vinegar instead.
Q: Can I pour hot water from pasta or cooking down the sink?
A: Let it cool slightly before pouring. And never pour it if it’s oily or starchy — those particles can gum up your pipes.
Q: What’s the best way to remove odors from the drain?
A: Try a mix of lemon juice and baking soda, followed by warm water. You can also grind citrus peels in the disposal if you have one.
Q: How do I know if my pipes are damaged from heat?
A: Signs include slow drainage, leaks, bubbling under the sink, or warped pipe surfaces. If in doubt, consult a plumber.
Q: Are there any benefits to using boiling water at all?
A: It’s great for sterilizing tools, cleaning surfaces, or loosening grime in cookware — but not for drains.
