Call the plumber when the your snag is quite big and requires experts to sort out, and when theres a higher risk of doing more damage than good. When the following situations arise, its best to call a professional plumber like Crystal Palace Plumbers and their name and number handy for emergencies.Low water pressure in the house:?This can be caused by a number of things, such as blockages in the pipes, low water pressure from the local supply or well, or even just poor design. A good plumber will be able to diagnose the problem and determine the cause.Replacing a water heater: Consider carefully before attempting to replace a heater by yourself. Remember, your Crystal Palace Plumber can carry the new one to the basement, hook it up, make sure that it works properly, and dispose of the old one.Sewer line stoppage:?If your sewer line wont stop backing up, you will have a blockage running out to the main sewer system. Call a professional plumber or drain-clearing service. They will get the job done correctly and give a guarantee. Frozen pipes:?If a pipe is frozen, look very carefully to see if the pipe has already split. If it has, then you should go ahead and call a plumbing service. You can sometimes try and thaw a frozen pipe with a heat source like a hair dryer, but even if the pipe isnt cracked, you should really call a plumber rather than try yourself to sort it. Some plumbers simply replace a section of frozen pipe rather than thaw it.Extensive water line damage:? Carrying out repairs to line damage which is generally the product of freezing,?can take up a lot of your valuable time. Its better to pay a plumber so that you can earn money at your regular job.