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Navien Condensing Tankless Water Heater

To help explain “condensing technology” for a tankless water heater imagine the condensation that forms on the outside surface of a glass of ice water. This condensation is purposely created inside Navien’s condensing heat exchanger (thats the secondary heat exchanger) from the incoming cold water. This cold water works to cool the hot gases inside the unit increasing its efficiency. Navien’s stainless-steel condensing heat exchanger then traps this condensation and uses it, making the whole process incredibly efficient and economical. This condensation (or vapors and gases) would normally escape through the vents in a conventional tankless water heater. But with Navien’s technology the water heater reuses the condensation, providing one of the most efficient and economical tankless Water Heater a home owner can buy.

Tankless Water Heaters - how they work