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AP18733 REV. 3.2.17
23
▪ B. LEVELING
▪ C. CLEARANCES FOR SERVICE ACCESS
IMPORTANT
IMPORTANT
In order for the condensate to properly ow out of the collection system, the water heater must be installed level.
Do not connect the water heater to any heating systems or components that have been previously used for non-potable applications.
Do not introduce toxic chemicals, such as antifreeze or water heater treatments, into the water heater or any piping meant for potable water
purposes.
Ensure that all piping and components connected to the water heater are suitable for potable water applications.
Do not use this water heater for space heating applications.
Circulators suitable for DHW applications must be used.
The service life of the water heater’s exposed metallic surfaces, such as the cabinet, as well as internal surfaces, such as the heat exchanger, are
directly inuenced by proximity to damp and salty marine environments. In such areas, higher concentration levels of chlorides from sea spray
coupled with relative humidity can lead to degradation of the heat exchanger and other water heater components. In these environments, water
heaters must not be installed using direct vent systems which draw outdoor air for combustion. Such water heaters must be installed using room
air for combustion. Indoor air will have a much lower relative humidity and, hence, potential corrosion will be minimized.
5. If the water heater is to replace an existing water heater, check for and correct any existing system problems, such as:
• System leaks
• Location that could cause the system and water heater to freeze and leak.
• Incorrectly-sized expansion tank
6. Clean and ush system when reinstalling a water heater.
NOTE: When installing in a zero clearance location, it may not be possible to read or view some product labeling. It is recommended to make note
of the water heater model and serial number.
See Table 8 for recommended service clearances. If these minimum clearances are not provided, it may not be possible to service the water heater
without removing it from the space.
NOTE: The exhaust vent piping for this direct vented appliance is approved for zero clearance to combustible construction.
NOTE: If the water heater is installed in a narrow space or corner, ensure that there is sufcient space for service and maintenance access. There
should be easy access to the gas and water lines and internal components for future service. A combustible door or removable panel is acceptable
front clearance.
WARNING
Space must be provided with combustion/ventilation air openings correctly sized for all other appliances located in the same space as the water
heater. The water heater cover must be securely fastened to prevent it from drawing air from the water heater room. This is particularly important if
the water heater is in a room with other appliances. Failure to comply with the above could result in substantial property damage, severe personal
injury, or death.
MINIMUM CLEARANCES
Installation Clearances from Non-Combustibles / Combustibles Recommended Service and Proper Operation Clearances
Top 9 in. (228.6 mm) 9 in. (228.6 mm)
Back 5/8 in. (15.9 mm) 5/8 in. (15.9 mm)
Front 6 in. (152.4 mm)
24 in. (609.6 mm) or more (Front of Water heater)(A combustible door
or removable panel is acceptable front clearance.)
Right Side
3 in. (76.2 mm) 3 in. (76.2 mm)
Left Side
Bottom 12 in. (304.8 mm) 12 in. (304.8 mm)
Table 8 – Minimum Installation and Service Clearances
▪ D. RESIDENTIAL GARAGE AND CLOSET INSTALLATIONS
IMPORTANT
Check with your local Authority Having Jurisdiction for requirements when installing water heater in a garage or closet. Please read the entire
manual before attempting installation. Failure to properly take factors such as venting, piping, condensate removal, and wiring into account before
installation could result in wasted time, money, and possible property damage and personal injury.
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