If propane is common in your area, you may want to keep this in mjnd. Navien Recalls Tankless Water Heaters and Boilers Due to Risk of Carbon Monoxide Poisoning | CPSC.gov
frotte (Frank Rotte, , CPI, San Diego Home Inspector) #1
rcooke (Roy D. Cooke, Sr) #2
Great info thanks Frank .
Much appreciated Roy C