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• If the right side 24” service clearance is reduced, adequate clearance must be maintained to easily read and access the
controls. Alternatively, access may be provided using a door. The right side clearances shown for boilers equipped
with tankless heaters allow for removal of the tankless heater.
2) This boiler may be installed directly over a non-carpeted combustible floor.
3) The boiler must be installed on a hard level surface.
4) Do not install this boiler in a location where gasoline or other flammable vapors or liquids will be stored or used. Do not
install this boiler in an area where large amounts of airborne dust will be present, such as a workshop.
5) The boiler should be located as close to the chimney as possible.
6) Do not install this boiler directly on a surface that may get wet. Raise the boiler on a pad.
V Air for Combustion and Ventilation
Sufficient fresh air must be supplied for combustion, ventilation and flue gas dilution. Provisions for combustion, ventilation
and flue gas dilution air for gas utilization equipment vented by natural draft must be made in accordance with local building
codes or, in absence of such codes, in accordance with sections 5.3.3 and 5.3.4 (“Air for Combustion and Ventilation”) of the
National Fuel Gas Code, NFPA 54/ANSI Z223.1.
To ensure an adequate supply of combustion, ventilation and flue gas dilution air supply, start by determining whether the
boiler is to be installed in a building of unusually tight construction. A good definition of a building of unusually tight
construction is one which has all of the following features:
• Walls and ceilings exposed to outside atmosphere have a continuous water vapor retarder with a rating of 1 perm or
less with openings gasketed and sealed
• Weather stripping has been added on openable windows and doors
FIGURE 2: CWI BOILERS - CLEARANCES TO ALL
TYPES OF COMBUSTIBLE CONSTRUCTION AND
NONCOMBUSTIBLE CEILINGS, WALLS, AND DOORS.
“X”
“X” (RH CLEARANCE)
ALL SIZES LESS TANKLESS HEATER - 18“
CWI103 - CWI241 WITH TANKLESS HTR. - 18“
CWI276 - CWI379 WITH TANKLESS HTR. - 21“
CWI207 - CWI379 WITH HIGH CAPY. TANKLESS HTR. - 24“