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The Navien NPE-240S2 is a condensing tankless water heater rated 13,300 to 199,900 BTU/h on natural gas or propane. It uses the same cabinet and dual stainless steel heat exchangers as the NPE-240A2 but drops the internal recirculation pump, which gives it the higher efficiency rating of the two. It delivers 11.2 GPM at a 35°F rise, 8.7 GPM at 45°F and 5.8 GPM at 67°F, so it covers roughly two simultaneous showers on a cold winter day. It suits homes with gas service and cold incoming water that want high capacity without paying for built-in recirculation; buyers who want instant hot water at the tap should look at the A2 instead.
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The Navien NPE-240S2 is a condensing tankless water heater from the NPE-2 series. It uses a pair of stainless steel heat exchangers, primary and secondary. It has the same cabinet and heat exchangers as the NPE-240A2 but no internal pump, which gives it the higher efficiency rating of the two, 0.96 UEF.
It is certified for natural gas and propane. Input modulates between 13,300 and 199,900 BTU/h, so it does not run at full fire for small draws. Minimum activation flow is 0.5 GPM.
Flow depends on temperature rise. It delivers 11.2 GPM at a 35°F rise, 8.7 GPM at 45°F and 5.8 GPM at 67°F. With 2.5 GPM showerheads, the 67°F rating supports roughly two showers at once. Gas connection, venting and condensate disposal must be done by a licensed installer, following the Navien manual and local code.
