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Directory Results for PE405-6 CHX.qxd. The NWH-3 series is a general-purpose water or water-based solution circulation heater intended for use indoors. It is designed for 150 psig at 550 F per ANSI standards. to PE408-4 CHX.qxd. The NWHO-6 series is a general-purpose regular and fuel oil solution circulation heater intended for use indoors. It is designed for 150 psig at 550 F per ANSI standards.