Irvine, CA — Navien is expanding their line of condensing tankless NPE water heater series by adding the NPE-150S model. This smaller size “S”, Standard version, with an efficiency of 0.97 EF, has a heating capacity of 18,000-120,000 BTU/H and will produce 5.3 GPM @ 45 degree temperature rise. Ideal for small residences or to cascade where a bit more DHW is required.