This method is

It is very important to water the entire frozen area completely and evenly. The method of heating with an open flame (a burner ("primus"), a torch, a soldering lamp is very effective). But at the same time, keep in mind that this method cannot be used indoors to avoid a fire and it cannot be used in heating plastic pipes. Another method is heating using heat devices (hairdryer, thermal tank (heat gun)). To do this, you need to create a closed space around the problem area with a casing or a spacious sleeve, and then heat the air in this space, directing a stream of hot air towards it. This method is not as effective and fast as the aforementioned, but, nevertheless, can help solve the problem.