Navien is the global leader in condensing technology and the name behind the best . All backed up by the very best customer support. Navien UK History. 2016. 9. 2. - (www.navien.co.uk). For warranty service, always contact an official Technical Assistance Service (TAS) first. Contact the technician or professional who installed your boiler. Contact a Gas Safe Registered engineer. Navien condensing tankless water heaters & boilers for residential and light . use innovative high efficiency technology to provide a comfortable environment. Navien technical support offers coast to coast coverage with two world class support centers and live technicians providing the help you need, when you need it. Indoor thermostat. NR30S. Customized heating that uses a new concept to save gas charges. View more. Indoor thermostat NR30S. 01 Home; 02 Product . Indoor thermostat. NR30S. Customized heating that uses a new concept to save gas charges. View more. Indoor thermostat NR30S. 01 Home; 02 Product . 2014. 10. 8. - Another guy from Tankless Concepts dropped by to help lift the tank out of . But the PVC cap on the pipe, as Wendy put it, "Looks like a giant . 2009. 8. 10. - Hello, Recently, we had a Navien tankless hot water heater installed in our home. We are satisfied with it's performance on the hot water side of. . One idea we have is to route the vent much higher up the side of the house so Clueless UK- Plumber has apparently called Navien Tech Support and they .