Read all safety warnings in the “User’s Operation Manual”. The additional safety issues
outlined below must also be followed completely when installing this Navien Combination
Water Heater / Heating Boiler.
All applicable local, state, national and provincial codes, ordinanes, regulations and laws.
For installations in Messachusetts – code requires the boiler to be installed by a licensed plumb-
ing or gas fitter.
The National Fuel Gas Code NFPA 54/ ANSI Z223.1
National Electric Code ANSI/NFPA 70.
For Installations in Canada – “Installation Code for Gas Burning Eqiupment” CGA/B 149.1 or
B149.2 Canadian Electrical Code Part 1 CSA C22.1
Standard for Controls and satety devices for automatically fired boilers, ANSI/ASME CSD-1,
when requred.
The installation must conform to the requirements of the authority having jurisdiction or, in the
absence of such requirements, to the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or
CAN/CSA B149.1, Natural Gas and Propane Installation Code.
This unit is designed for indoor/outdoor installations. DO NOT operate this unit without the vent
piping connected. Exhaust gases must be completely expelled out of the building.
DO NOT use this appliance if any part has been underwater. Immediately call a qualified service
technician to inspect the appliance and replace any part of the control system and any gas control
which has been underwater.
Be sure not to reverse the water and gas connections as this may damage the gas valves.
Water temperature over 125°F can cause severe burns instantly or death from scalding. If the
proposed Water Heater / Heating Boiler outlet temperature is above 125°F, a thermostatically
controlled mixing valve (or a temperature limiting valve) for reducing point of use water tempera-
ture is recommended to reduce the risk of scald injury. Contact a licensed plumber or the local
plumbing authority for further information.
The appliance should be located in an area where leakage within the unit or at its connections will
not result in damage to the surrounding area. Navien will not be responsible for any damage
resulting from leaking if adequate drainage is not provided.
DO NOT use this combination Water Heater / Heating Boiler for any purpose other than water
heating and space heating.
If the water quality is known to be highly acidic and/or extremely hard, water treatments (i.e water
softners) are recommended to maintain full warranty. Consult the local water authority.
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Installation Warnings:
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