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The NPE-A series condensing tankless water heaters feature: 1/2-inch gas pipe capability, 2-inch PVC venting, dual stainless steel heat exchangers, ComfortFlow recirculation including pump and buffer tank, field gas convertibility and an elegant compact design. Up to 16 units can be cascaded together without an external control and are ideal for commercial and residential applications. Highly efficient at 0.97EF: NPE-180A, NPE-210A, NPE-240A. Now available with On Demand activation.