15Installing the Water Heater
3.1 Choosing an Installation
Location
When choosing an installation location, you
must ensure that the location provides adequate
clearance for the water heater, adequate venting
and drainage options, and sufficient access to gas,
water, and electrical supplies. Carefully consider
the following factors when choosing an installation
location:
WARNING
●
Review all of the installation information
in this manual before starting installation.
Consider all the requirements for venting,
piping, condensate removal, and wiring.
●
Do not install this water heater in a
recreational vehicle, trailer, boat or other
moving vehicles as it will result in a Carbon
Monoxide Poisoning Hazard.
Note
If the water heater is installed in
Massachusetts, see "Requirements for the
State of Massachusetts" on page 140.
About Water Quality
Proper maintenance of the water heater is required
when water quality does not meet EPA standards.
Damage caused by poor water quality is not
covered under warranty. The following table shows
the maximum contaminant levels allowed, based
on the EPA National Secondary Drinking Water
Regulations (40 CFR Part 143.3). If you suspect that
your water is contaminated in any way, discontinue
use of the water heater and contact an authorized
technician or licensed professional.
Contaminant Maximum Allowable Level
Total Hardness Up to 200 mg/l (12 grains/gallon)
Aluminum 0.05 to 0.2 mg/l
Chloride Up to 250 mg/l
Copper Up to 1.0 mg/l
Iron Up to 0.3 mg/l
Manganese Up to 0.05 mg/l
pH 6.5 to 8.5
Sulfate Up to 250 mg/l
Total
Dissolved
Solids (TDS)
Up to 500 mg/l
Zinc Up to 5 mg/l
Chlorine Up to 4 mg/l
If your local water is hard, please review the
following recommended treatment and flushing
guidelines.
Hardness Level
Treatment
Method
Flush
Frequency*
Soft
0-4 grains/gal
(0-60 mg/L)
None
None
Moderately
Hard
4-7 grains/gal
(61-120 mg/L)
Water
Softener**
or Navien
PeakFlow is
Recommended
Once/Year
Hard
7-9 grains/gal
(121-160 mg/L)
Residential:
Once/Year
Commercial:
Twice/Year
Very Hard
9-12 grains/gal
(161-200 mg/L)
Water
Softener**
or Navien
PeakFlow
is HIGHLY
Recommended
Extremely
Hard
>12 grains/gal
(200 mg/L)
Water
Softener**
or Navien
PeakFlow is
Required
* Flushing is recommended if a treatment device is
not installed. This procedure should be performed
using white vinegar or solutions that are specifically
formulated for use on tankless water heaters. See page
115 in the Appendix for more information on flushing
the heat exchanger.
** Check local codes for any restrictions on use of water
softeners.
3. Installing the Water Heater
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