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Descaling Navien tankless water heater, do I need to do anything w/ this valve before pumping white vinegar into heater? : r/Plumbing
HVAC-Talk: Heating, Air & Refrigeration Discussion
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City inspector is confident that T&P valve on a tankless is to code. Maybe, but the valve certainly isn't installed to specs. : r/Plumbing
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3/4" Pressure Relief Valve Perfect for Tankless Water Heaters (FWL-2)
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NAVIEN 30022163A 3/4" LEAD-FREE ISOLATION VALVE KIT WITH RELIEF VALVE & RECIRCULATION RETURN.
