NSS Certified Navien Service Specialist VIP Practice Exam

NSS — The Navien Service Specialist (NSS) certification is issued by Navien Inc. to validate technician competency in the installation, commissioning, diagnostics, and service of Navien tankless water heaters (NPE series), combi-boilers (NCB series), and hydronic boilers (NHB series). Navien administers training and assessment through its online NSS portal; no single publicly disclosed question count or time limit has been formally published, so 30 questions / 90 minutes / 80% pass mark reflect standard industry certification norms for this credential type.