Warnings
Keep the area around a boiler clear of combustible materials, gasoline, and other
flammable vapors and liquids.
Ensure combustion air is not drawn from areas containing corrosive air such as
swimming pools or spas, including air directly next to outdoor pools and spas.
Ensure that a boiler is not exposed to water leaks from piping or components located
overhead, including condensation from uninsulated cold water lines overhead.
Protect the gas ignition system components from water (dripping, spraying, rain, etc.)
during appliance operation and when servicing (pump replacement, condensate trap
servicing, control replacement, etc.).
Ensure that combustible materials do not make contact with exposed water piping
and associated components (relief valves, circulators, etc.). Check local codes for
required clearances and/or provide adequate insulation.
3.2.1 Factors to consider for best installation conditions
Install the boiler in areas where the combustion air source is not subject to chemical fouling or
agricultural vapors. Exposure to corrosive chemical fumes such as chlorinated and/or
fluorinated hydrocarbons can reduce the life of a boiler. See list of Known contaminants on page
6. For this reason, do not use the indoor air venting option (using air surrounding the boiler) in a
laundry room. Similarly, ensure any direct vent air source is not near a clothes dryer exhaust
terminal. Avoid agricultural applications where the boiler and/or the intake air source are
affected by ammonia and/or dust.
Avoid installing a boiler where water leakage will cause damage; for example, above carpeting.
If unavoidable, install a suitable drain pan under the appliance.
Other factors to consider:
The minimum clearance requirements for combustible materials (see Table 4 ).
For adequate servicing, we recommend a minimum 30" clearance at the front and 12" above the
boiler. Check local codes for additional access and service clearance requirements.
At a new construction site, or during renovations:
Take action to protect the boiler from drywall dust or other construction related
contaminants
Ensure combustion air is drawn from a clean source (e.g., outdoors)
Isolate the boiler from interior dust sources. Do not seal boiler case openings directly when
firing - allow for air circulation and ventilation in the immediate area.
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