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Choose an Installation Location
When selecting an installation location, you must ensure that clearances will be met and that the vent length will be
within required limits. Consider the installation environment, water quality, and need for freeze protection.
Requirements for the gas line, water lines, electrical connection, and condensate disposal can be found in their
respective installation sections in this manual.
Water Quality Guidelines
This section provides information on the importance of water quality to the Rinnai Tankless Water Heater. The
information is intended to serve as general guidelines only and is not a complete list of water quality guidelines.
Consideration of care for your water heater should include evaluation of water quality. The water must be potable,
free of corrosive chemicals, sand, dirt, or other contaminants. It is up to the installer to ensure the water does not
contain corrosive chemicals or elements that can affect or damage the Rinnai Tankless Water Heater. Water that
contains chemicals exceeding the levels below can damage the Rinnai Tankless Water Heater. Replacement of
components due to water quality damage is not covered by the warranty.
* Source: Part 143 National Secondary Drinking Water Regulations
If you install this water heater in an area that is known to have hard water or that causes scale build-up, the water
must be treated and may require a more frequent flushing schedule.
This water heater includes a service indicator (Service Soon, SS). When selected in the parameter settings, an SS code
will display on the controller indicating that it is time to flush and service the water heater. Scale build-up is caused by
hard water and can be accelerated if the water heater is set at a high temperature.
Rinnai offers Southeastern Filtration's "ScaleCutter Water Conditioning System" that offers superior lime scale
prevention and corrosion control by feeding a blend of control compounds into the cold water supply.
Environment
Air surrounding the water heater, venting, and vent termination(s) is used for combustion and must be free of any
compounds that cause corrosion of internal components. These include corrosive compounds that are found in aerosol
sprays, detergents, bleaches, cleaning solvents, oil based paints/varnishes, and refrigerants. The air in beauty shops,
dry cleaning stores, photo processing labs, and storage areas for pool supplies often contains these compounds.
Therefore, it is recommended that external (outdoor) models be used for these locations where possible. In
applications utilizing room air where there are high levels of particulates, Rinnai offers a room air screen.
The water heater, venting, and vent termination(s) should not be installed in any areas where the air may contain
these corrosive compounds.
Rinnai Commercial Hybrid System Installation and Operation Manual
Contaminant
Total Hardness
Aluminum *
Chlorides *
Copper *
Dissolved Carbon Dioxide (CO2)
Iron *
Manganese *
pH *
TDS (Total Dissolved Solids) *
Zinc *
Maximum Level
Up to 200 mg/L
Up to 0.2 mg/L
Up to 250 mg/LL
Up to 1.0 mg/L
Up to 15.0 mg/L
Up to 0.3 mg/L
Up to 0.05 mg/L
6.5 to 8.5
Up to 500 mg/L
Up to 5 mg/L
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