Toilets are made of vitreous china (porcelain). While porcelain is durable against standard impacts, it is notoriously sensitive to . If your toilet is cold (common in winter or in basements) and you pour in 212°F (100°C) water, the rapid expansion of the ceramic can cause the bowl to crack or shatter. A cracked toilet bowl is not repairable; it requires a full replacement.
Think of it as "hot tap water" or the temperature of a hot bath—roughly 120°F to 140°F (49°C to 60°C). This is hot enough to dissolve paper and melt grease, but cool enough to protect your porcelain, your wax ring, and your pipes. hot water down toilet
Pouring hot water down a toilet is a common DIY home remedy for clogs, but it is a technique that requires precision. While can effectively melt away organic blockages, boiling water can cause permanent, expensive damage to your plumbing fixtures. The Danger of Boiling Water Toilets are made of vitreous china (porcelain)
However, there is a massive difference between "hot" water and "boiling" water. A cracked toilet bowl is not repairable; it
Johnson, K. (2020). The Impact of Hot Water on Toilet Components. Plumbing Today.
Why hot water? The logic is sound, mostly.