Navien NFC Series User's Information Manual page 25

What is not covered?
Navien's Limited Warranty shall be void in the event of an
occurrence of any of the following:
Improper installation, including but not limited to, installation in
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violation of applicable rules, laws or building codes, inadequate
water quality, condensate damage, improper venting, incorrect
gas type, water pressure, absence of a drain pan, improper
conversion from Natural Gas source to Propane, reinstallation at
another location, etc.
Accident, abuse or misuse including but not limited to
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installation for non- recommended uses, failure to follow or
comply with the User's Operational Manual, etc.
Improper maintenance including but not limited to, scale
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buildup, vent blockage, failure to maintain, etc.
Modification, alteration, addition of non-approved components,
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or misapplication of the Product in any manner.
Any damage caused by local adverse conditions including
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but not limited to water quality, hard water deposits, lime or
mineral build-up, operating in corrosive atmospheric elements,
alterations in smell or taste of water that have an adverse
reaction on the unit, etc.
Damage or problems caused by gas flow issues, electrical surges,
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flooding, fire, freezing, abnormal external temperature, force
majeure, riot, act of war, or any acts of God.
Performance problems caused by improper sizing of the boiler,
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the gas supply line, the venting connection, combustion air
openings, electric service voltage, wiring, fusing or any other
components, parts or specifications.
Vibration and noise unless caused by a defect in materials or
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workmanship. Any other causes other than defects in materials
or workmanship.
Operating the Product at water temperatures outside the factory
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calibrated temperature limits and/or exceeding the maximum
setting of the high limit control.
Subjecting the heat exchanger to pressures or firing rates
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greater or lesser than those shown on the rating plate or
removal of or alteration to the rating plate.
Installation at any location outside the United States or Canada.
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Improper conversion from natural gas to liquid propane gas or
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liquid propane gas to natural gas or attempt to operate with a
type of gas not specified for the boiler.
Accidental or intentional damage.
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There is no warranty on any Product purchased through the
internet or from any installer that obtained the Product from a
supplier or distributor not authorized by Navien.
24 Warranty
Warranty Limitations
EXCEPT AS EXPRESSLY PROVIDED HEREIN, THERE ARE NO OTHER
WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
LIMITED TO WARRANTIES OR MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE, WHICH EXTEND BEYOND THE DESCRIPTION
OF THE WARRANTY HEREIN AND FURTHER NAVIEN SHALL NOT BE
LIABLE FOR INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL,
PUNITIVE OR OTHER SIMILAR DAMAGES THAT MAY ARISE,
INCLUDING LOST PROFITS, DAMAGE TO A PERSON OR PROPERTY,
LOSS OF USE, INCONVENIENCE, OR LIABILITY ARISING FROM
IMPROPER INSTALLATION, SERVICE OR USE OF THE PRODUCT.
ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
ARISING UNDER STATE LAW ARE LIMITED IN DURATION TO THE
PERIOD OF COVERAGE PROVIDED BY THIS WARRANTY, UNLESS THE
PERIOD PROVIDED BY STATE LAW IS LESS.
No one is authorized to make any other warranties on behalf of
Navien. Some states do not allow the exclusion or limitation of
incidental or consequential damages, or how long an implied
warranty lasts, so the above limitation may not apply to you.
This Limited Warranty gives you specific legal rights and you may
also have other rights which vary from state to state.