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Installation Clearances - Bosch 660 EF User Manual

Indoor model/ natural gas/lp gas boilers
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Installation instructions
Make sure that the location allows
installation of the exhaust vent as
State of California:
The water heater must be braced, an-
chored or strapped to avoid moving dur-
ing an earthquake. Contact local utilities
for code requirements in your area or call:
1-866-330-2730 and request instruc-
The Commonwealth of Massachusetts:
1) The outdoor units (EFO) can only be
used if they are for summer use only.
2)The water heater can be used for hot
water only and not in a combination of do-
mestic and space heating.
For Venting Manufacturers Requirements, see websites
or phone numbers listed below:
Bosch Vent System

Installation Clearances

Warning: Before installing, check for
the following:
Install in accordance with relevant
building and mechanical codes, as well
as any local, state or national regula-
tions, or in the absence of local and
state codes, to the National Fuel Gas
Code ANSIZ223.1/NFPA 54 – latest
edition. In Canada, see NSCNGPIC for
detailed requirements.
For 660 EF
Required Clearances From Heater
• Maintain the following clearance from both combus-
tible and non-combustible materials.
12" (300 mm) or more
2" (50mm) or more
Fig. 14
4" (100mm) or more
Cooking Equipment
If the unit will be installed in the vicinity of a perma-
nent kitchen range or stove that has the possibility of
generating steam that contains fats or oils, use a
dividing plate or other measure to ensure that the unit
is not exposed to air containing such impurities
• The dividing plate should be of noncombustible
material of a width greater than the water heater.
Exhaust hood
Dividing plate
Fig. 15
Securing of space for repair/inspection
• If possible, leave 8" (200mm) or more on either side
of the unit to facilitate inspection.
• If possible, leave 24" (600mm) or more in front of the
unit to facilitate maintenance and service if neces-
• If possible, leave 3" (75mm) or more above and
below the vent pipe to facilitate inspection and repair
if necessary.
Fig. 16
6 720 644 063



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660 efo