In winter, when it gets cold outside, there is a temptation to leave your outside faucet open to get the heat from the water. But, there are also several disadvantages to doing so.
One of the biggest problems with leaving the outside faucet open is that it allows for bacteria growth, which can lead to sickness.
In cold weather, water is a great insulator and you may think it is a good idea to keep your faucet dripping for warmth. However, this can actually cause problems
If you are lucky you have an old, slow dripping faucet (as opposed to a modern faucet with pressure-assisted flow).
In that case, it should work just fine. But if your water supply is modern, you'll have to run it through a pressure regulator or other device to prevent the water from shooting out. You can also use a bucket of cold water to fill up the pipe. Then you won't need to worry about pressure.