I have replaced the hot water heaters also on my last two homes,by myself .
Its very simple . You can buy some shark bites for attaching the water lines .the exhaust is the easiest if you replacing the same size tank .
The gas line is the tricky part . they say you need to hirer a gas fitter for this to be legal . i think they place their sticker on the unit once they hook it up .
I have done a lot of gas lines on propane generators so i did mine my self .
which is a no no they say when it comes to houses .
My next one i will do my self but will get a gas guy in just for that part .
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