What are the minimum clearances for indoor installation of the Navien NPE-240A?
For indoor installation, the minimum clearances from the water heater are: top – 9 inches (229mm), back – 0.5 inches (20mm), front – 4 inches (100mm), sides – 3 inches (76mm), and bottom – 12 inches (300mm).
From the official Navien Npe 240a manual, page 1
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