Registers are the vents where the heat comes out......just above the floor. One is in the center console between the DS and PS...that is zone one. Another one is below the kitchen sink.
If you haven't had any heat or hot water problems in 3 years, or received the letter from Aqua Hot, your unit is probably fine.
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Chuck in SW FL
Digital 2021 Cornerstone "B"
A "Digital" 2019 Cornerstone "B" Traded
A "Classic" 2014 Anthem 42 RBQ---Sold
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