Customer Stated: They were unable to get any hot water throughout the home. Tech Notes: Upon inspection I found that this is a Navien tankless propane, powered unit located in the garage of home, and is only about 4 to 6 years of age which is still under manufacturing warranty. Initially, I had homeowners run hot water in multiple locations of home, and was unable to get the tankless unit to ignite. I called Navien tech-support, and waited 45 to 50 minutes on hold with no response from anyone in tech-support. While on site I did notice that the condensing heat exchanger seem to have a lot of water dripping from it which indicates this could be the failed component. I let homeowner know that because I cannot reach anyone from Navien tech-support that I would recommend either reaching out to them for replacement of heat exchanger or to replace the whole unit itself. I presented options to have the heat exchanger replaced, or to have the whole unit replaced, and homeowners elected to rea