Whether you need an endless supply of hot water, efficient home heating or both, Navien has the most energy efficient solutions.

We offer the industry’s most advanced condensing tankless water heaters and condensing boilers and the first residential combi-boiler strong enough to support whole house heating and hot water supply.

Navien’s high efficiency and eco-friendly condensing technology can reduce energy consumption by 20% and significantly reduce greenhouse gas emissions.

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Product Serial number is 15-16 digits and can be found either on the right side of the box or the back of the front cover.
Navien, Inc. Technical Customer Service Department

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