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manual. It is very important to understand the safety instructions before installing, operation or servicing Navien water heater. Safety Related Symbols.Navien tankless water heaters & boilers for residential and commercial applications use innovative high efficiency technology to NPE-240A Downloads. Tankless Water Heater Downloads ManualNPE-2 User's Information ManualNPN Installation and Operation ManualNPN User's Information ManualNR-NP Total Navien NR-240A/NR-240 – Gas Tankless Water Heater ; Eco Navien Technology · Navien's condensing technology uses less gas than conventional water heaters, Get genuine Navien factory OEM repair parts for your NR-240A-NG tankless water heater. All Navien parts are brand new in the original factory packaging and Service Manual Service Manual Service Manual Tankless Gas Water Heater NR/NP Series NR/NP Ver. 2.00 Tankless Gas Water Heater Tankless Gas Water Heater All Navien's NR & NP Series Water Heaters are condensing gas appliances. A condensate trap comes factory installed inside each Water Heater. All condensate must