The plumbing courses cover all the aspects that you will be required to deal with as a new toilet. You will be taught about the basic aspects as well as about health and safety issues and sanitation.
Be cautious. If you've just become aware of a problem with water line repair in your home, there are a few steps you should take. First, if there's a lot of water (such as from flooding), you should turn off your electricity to avoid electrocution. Also, don't use your regular household appliances (such as a vacuum cleaner) to remove water. If the water is contaminated (such as from a sewage line), you and your family should leave the home so that you don't get sick. Finally, if the water is from a leak, try to locate the leak's source and turn off the water to prevent further damage.
If you need to add copper pipe make sure that you clean the old and new pipe by using sandpaper, inside and out. If it's not clean the solder will not flow into the joint. Another tip is to not over wrap the mail threaded pipe with tape, this can cause a leak. Twice around should be enough. Also, don't over tighten it.
Blisters in asphalt or felt roofs only need to be treated if they contain water or have caused the roof covering to leak. Press the blister to check if moisture is expelled. If so, it must be sealed with a patch.
As with anything, when you are not sure how to fix a plumbing issue and when you don't have the proper equipment, you should contact a professional. They can usually find out what the problem is and resolve it for you in a short period of time. They will also be able to tell you if you have any other problems and water line repair they can suggest resolutions.
To avoid this, make sure your toilets screws are always tight and repair any leaks right away. A new wax ring should also be installed any time the toilet is removed such as if you happen to be replacing an old toilet with a newer model that you liked such as a more modern KOHLER brand. Replacing your toilets wax ring is pretty simple to do and can pretty much be done in less than an hour by the average person.
The plumber you hire does not normally do heating but will do hot water heating or in floor heating in the house. Some places you can use the water heater for both domestic hot water and for in floor heating if the heating is a secondary heat. Check with your local plumbing codes on this to be clear.