If the bathtub drain is against an exterior wall, you may need to apply heat from the outside.
Pour the hot water slowly into the drain — about 1 cup at a time. Wait a minute between pours. This prevents thermal shock to pipes.
This is the first method you should try, as it is the easiest and least invasive. how to unthaw bathtub drain
Once the drain is thawed, take steps to prevent it from happening again:
| Don’t | Why | |-------|-----| | Use a blowtorch or propane heater | Will melt pipes or start a fire | | Pour boiling water directly | Can crack porcelain tubs or PVC joints | | Use chemical drain cleaners | They don’t work on ice and can splash back | | Keep running water if completely frozen | Water may back up and flood the bathroom | If the bathtub drain is against an exterior
To unthaw a bathtub drain, the most effective methods include pouring a mixture of hot water and salt down the drain or using a hair dryer on exposed pipes. Frozen drains typically occur in the P-trap, where water remains stationary, or in pipes located along uninsulated exterior walls.
: Is your tub located on an exterior wall? These pipes are the first to freeze. YouTube +5 Step 2: Remove Standing Water If your tub is full of cold water, any heat you apply will be wasted trying to warm that standing pool. Use a bucket or a small pump to remove as much water from the tub as possible so your thawing agents can reach the ice directly. Step 3: The Safe Thawing Methods Never use an open flame (like a blowtorch) to thaw pipes; this is a massive fire hazard and can cause the pipe to burst from uneven heating. Instead, use these safer methods: Total Drainage Services +2 10 sites What Should You Do If You Have A Frozen Drain Pipe? Jan 22, 2026 — This prevents thermal shock to pipes
: Place a portable space heater near the area (like under a sink cabinet or in a crawl space) to raise the ambient temperature. Never leave a space heater unattended and keep it away from flammable materials. Essential Safety Steps
Can a tub drain pipe freeze and how to prevent it? - Facebook
Using a blowtorch, propane heater, or welding torch to thaw PVC or plastic pipes will melt the pipe and cause a leak. Even on metal pipes, open flames are a major fire hazard. Stick to the safe methods below.