The hardest part was getting the natural gas connection right. The connection is inside the heater and you have to take the cabinet apart to get at the fitting to make your connection. Mine may have been missing a part, but I felt I also had to make a part that would hold the piping in place where it comes out of the heater so it doesn't cause undue stress to the connections and piping inside the heater cabinet. The heater itself works very well and am quite happy with it.
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