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Welcome to the forum. I see you have no responses so far......and while I am not familiar with your coach, you should refer to the manual for your water heater which typically contains basic information about the unit’s installation. Sometimes these units use butyl tape between coach wall and the flange on the water heater (depending on unit) and may also require caulking as well around the outside perimeter.
How are you detecting the water infiltration after each rain? Do you mean water is on the rough floor inside the coach exterior wall, where the water heater is physically installed?
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