Warning: Before performing any work, make to be properly dressed and equipped with the required material, tools and safety accessories.
Remember, if decide to use any electrical thawing method, be sure to be using rubber gloves and proper shoes to avoid risk of electrocuting yourself.
Thawing Frozen Pipe (Water Lines):
1 - Shut off the main water line to the house.
2 - Locate the faucet that is directly connected to the frozen pipe and open it to allow drainage.
3 - If your home has galvanized or copper pipes, use the boiling water method. You do that by wrapping towels or rags around the pipe and pouring boiling water over the towels. You start this process from the faucet to the frozen pipe section. Repeat the process for at least 10 to 15 minutes.
4 - You can also use hair dryer to heat up the frozen pipe, just follow the same process as step 4 but, if does it work, then, use the next method.
5 - Heat lamp is a good alternative method, it might take a little bit longer but, if you know the location of the frozen pipe, then, it might work effectively.
PS: The above method can only be applicable it the frozen pipe is located inside the house, but if the problem is outside, you will have to contact a local company to do the work.
PS: Also, if your outside water line is frozen and, the line is made of plastic, then, thawing the frozen line becomes an almost impossible task, this is due to the fact that, most companies use the electrical method to thaw the line but, it can only be used in metal pipes (copper or galvanized pipes).
Information provided here, it is provided as is and, you use it at your own risk.