While boiling water is a common DIY suggestion for unclogging drains, the short answer is , especially if your home uses modern plastic piping. Why Boiling Water Can Be Dangerous for Your Plumbing
Water from your bathtub faucet, turned to the hottest setting, is safe for your pipes. It is usually hot enough to help dissolve minor soap scum but not hot enough to damage PVC. Let it run for 5–10 minutes. can i put boiling water down shower drain