Navien condensing combiboiler technology provides
Navien condensing combi-boiler technology provides up to 95.0% afue, recognized by energy star as most efficient these extremely efficient and eco-friendly units provide extra energy savings over a traditional floor standing boiler and storage tank. Wssc master plumber / gasfitter #71763. If we hadn’t had a home buyers' cctv drain survey at the property we hoped to buy we would not have known what.