The best way to thaw frozen pipes is to apply some form of heat. The heat slowly thaws the water so that it flows freely.
When using heat, users should first turn the faucet on slightly, even if water does not drip. As the water thaws, it will flow through the pipes to help prevent immediate refreezing. After turning the faucet on, use a hair dryer or portable heater by placing it as close to the pipe as possible without it touching it. Hot towels can also be wrapped around the pipe. After the pipes thaw, users should insulate the pipes to prevent refreezing.