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Heating and plumbing cpmpanies have contractors insurance. This protects both you and them in case something goes wrong.
In the past I have found that finding problems with a house you just purchased later on is difficult to pursue. The problem with this issue is that I am not sure what you are referring to and the plumbing may not have been out of code when the house was built. You would have better luck going after the inspector. It is your house now. Have it properly re-plumbed.
Plumbing
23
Same as all other plumbing in civilized countries
Water, drain, and vent lines that are used to plumb a house.
Not necessarily, depends what and where plumbing work is to be done. Check with local plumbing authority about needing license or not. Sometimes you need license to pull permits to do plumbing work. Plumbers usually have at least a journeyman's license.
plumbing
NO, anchors are on ships
They unclog Toilets and other plumbing in the house
Galvanized steel is better for plumbing in a bathroom sink. It lasts a lot longer than PVC.
No, they do not have to be licensed. But it is far better to use a licensed plumber because they are insured for their work and are up to date on new products and codes.