Skip the gadgets. Unless you have a commercial steam machine (overkill for most homes), hot water down the drain is the fastest, cheapest, and most effective thaw method. Just boil, pour, and repeat. Your pipes – and your wallet – will thank you.
To avoid dealing with frozen drain pipes in the future, take preventive measures: best way to thaw frozen drain pipe
There are two primary ways to safely thaw a pipe, depending on its location and material. Skip the gadgets