Navien’s new NPE-S series condensing tankless water heaters have a rated efficiency of 0.99 EF. The series is made for commercial and residential water-heating applications and is available in three models with maximum inputs from 150,000 to 199,900 Btu/hr., with outputs from 148,500 to 197,900 Btu/hr. Maximum flow rates range from 8.4 to 11.1 gpm. NPE-S units can be cascaded together up to 16 units without an external control box. Other features include 1/2” gas pipe capability up to 24’, 2” PVC venting up to 60’, dual stainless-steel heat exchangers, field gas convertibility and an elegant compact design measuring 17.3” x 27.4” x 13.2”. 

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