When faced with clogged drains from grease, food, or other debris, pouring boiling water down them might seem like a quick fix. However, plumbing professionals advise against this, especially during colder months.
The reasoning is straightforward. Pouring boiling water onto a cold surface can cause thermal shock, leading to pipe damage. This risk is heightened in winter.
Here's why you should refrain from pouring boiling water down your drains when the temperature drops, along with effective alternatives to prevent costly plumbing issues.
Why Boiling Water Can Damage Pipes in Winter
If you're struggling to keep your pipes from freezing, Devin Conley, CEO of a plumbing company, cautions against sudden heat. He states, 'Using boiling water on winter pipes is a slow-motion disaster. Many homeowners don't realize how fragile their pipes become in winter.'
'Every winter, I witness the aftermath. That 212-degree water hits pipes that might be hovering just above freezing due to insulation and exposure. This is particularly concerning with PVC pipes, which have been the standard since the 1980s.'
'PVC begins to soften at 140 degrees. At boiling point, it risks sagging and developing cracks at joints. If the adhesive at these joints fails or rubber seals weaken, leaks may go unnoticed until they cause significant damage.'
In winter, there's a compounded risk as cold pipes may pull away from joints, and the thermal shock from boiling water can exacerbate gaps, creating jagged edges.
'The outcome,' Devin explains, 'is a slow leak that often goes undetected for weeks or months, resulting in damaged woodwork.'
Pouring boiling water can also increase the likelihood of mold and mildew developing in hidden areas due to unnoticed leaks.
Similarly, Josh Mitchell, an HVAC expert, warns that while PVC pipes are particularly vulnerable, copper and cast iron can also sustain damage. 'They may last longer, but subjecting them to boiling water can induce stress fractures or tiny leaks at joints,' he adds. 'Often, these cracks only manifest when the weather warms up, and a slow drip can escalate into a major break.'
'Another winter challenge is grease. Boiling water can only move grease a short distance before it cools and hardens again. If food waste is involved, grease can trap debris, making clogs tighter and more difficult to clear.'
Safer Alternatives to Clear Clogs
Explore more effective alternatives.
This winter, if your kitchen sink gets clogged, avoid chemicals and boiling water, Devin recommends.
He suggests:
- 'FOG (fats, oils, and grease) should never go down the drain. Use paper towels to wipe pans clean and consider composting scraps.' A great option for this is the ENLOY Compost Bin available at Walmart, designed to prevent odors.
- 'Use a plunger for minor clogs. Every home should have a drain plunger with a flexible flange. The Korky BeehiveMAX Heavy Duty Toilet Plunger on Amazon is effective and costs under $16.'
- 'Consider a hand-crank drain snake for clogs in sinks and tubs. These tools can be found at most plumbing suppliers, and the Drainsoon Drain Auger 25 Ft available at Amazon is a reliable choice.'
- 'If you experience persistent slow drains, consider hydro-jetting your home's pipes using cold water. You may need to hire a professional for this. Hydro-jetting effectively clears grease and roots from main sewer lines and is typically as affordable as using a snake but causes less risk of damage.'
Additionally, Josh recommends using dish soap and hot tap water, not boiling water, right after cooking. Run it for 30 to 60 seconds to keep grease suspended. For this, consider Dawn Ultra Liquid Dish Soap available at Walmart.
If the clog persists, it's time to contact a plumber, as repairs for cracked drain lines can be costly. If your pipes have frozen and thawed, steer clear of hot water for a while. Allow them to warm up naturally or pour warm water gradually.
Lastly, maintaining the right heating temperature can help prevent frozen pipes and avoid the risk of bursts.
Shopping Recommendations
All prices were accurate at the time of publication.
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Meet the Experts
Devin is a plumbing expert with over ten years of experience, serving homeowners with a variety of plumbing needs.
As an HVAC specialist, Josh has been sharing his plumbing and HVAC insights since 2014 to assist homeowners with their heating and cooling challenges.
'While boiling water can work on glass and metal, it's unsafe for plastic pipes in cold conditions,' Josh emphasizes. 'It's essential to properly insulate your pipes.'
