As I understand it, Lowes and Home Depot will sell you a water heater and then hire a contractor from a list that they maintain to do the installation. Hopefully, if they get complaints about contractors on their list, they will be removed from the list. And, if a contractor screws up, the store will correct the problem. At least that is the way it should work. Sometimes it does and sometimes it doesn't. The advantage is that you have a third party to resolve any issues that may occur. The disadvantage is that you may pay a little more and may not get the best contractor available.
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