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The heat pump will get electric heating elements inside water tank if the demand increases rapidly. Using dark colors could make a room seem drab, uninviting and much smaller than it is. It may also cause moisture and mold to get up inside ceiling, that may stain the ceiling and make it start to bow in which it also can make it dangerous for you personally. If it gets under there, it will have to be removed and cleaned so it is not going to do more damage pc already has.
The moisture from your water will be inside the structure with the building materials like the plywood, particle board, other wood, and even inside concrete. Now you're ready to control