Navien Experts (Ricks Plumbing Service INC) 1050 Bridgeport ave, Milford- CT 06460 203.376.5208 800.524.4280 Jays@ricksplumbing.com Navien Maintenance CT Navien combination units “when installed properly” are engineered to have a serve life of over 25 years. There are numerous factors that decrease that number. Black iron piping or cast iron radiators kick off a great deal