Navien NPE-210S2 High Efficiency Condensing Tankless Water Heater
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$2,015.77at The House SupplierChecked Nov 8
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The Navien NPE-210S2 is a condensing tankless water heater rated 12,000–180,000 BTU/h on natural gas or propane, with dual stainless steel heat exchangers and a UEF of 0.96. It is the NPE-210A2 without the internal recirculation pump, which is why it earns the higher efficiency rating. It modulates down to 12,000 BTU/h and fires at 0.5 GPM, so it handles a hand wash as well as a shower. It suits homes that want high efficiency and whole-house 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-210S2 is a condensing tankless water heater from the NPE-2 series. It uses the same cabinet and the same pair of stainless steel heat exchangers as the NPE-210A2, but has no internal pump. That is why it carries the higher efficiency rating of the two.
It is rated at 12,000 to 180,000 BTU/h on natural gas or propane and is certified for both. The burner modulates down to 12,000 BTU/h, so it does not run at full fire to fill a sink. Minimum activation flow is 0.5 GPM, so it fires for a hand wash as well as a shower.
Output depends on temperature rise: the colder the incoming water, the less one burner can heat. At a 67°F rise it delivers 5.3 GPM, enough for roughly 2 showers at once with 2.5 GPM showerheads. Size to the 67°F rise if your winter groundwater runs cold. Gas connection, venting and condensate disposal must be done by a licensed installer, to the Navien manual and local code.
