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Installation instructions
3.10 Water quality
Water quality can have an impact on appliance
longevity and may void the manufacturer's warranty.
For water analysis data call your local water department,
or if on a well, have well water analyzed periodically. If
water quality exceeds one or more of the values
specified below, Bosch recommends installing a water
conditioner or softener. If the tankless water heater is
operating in applications where the outlet temperature
exceeds 140°F, a water softening system is strongly
recommended. The higher the set temperature is on the
appliance, the greater the risk for scale/mineral
deposits. Damage from scale/mineral deposits is not
covered under warranty. Refer to manufacturer’s limited
warranty.
Connecting the pressure relief valve (PRV)
The listed pressure relief valve supplied with the heater
must be installed at the time of installation. No valve is
to be placed between the PRV and the heater. No
reducing coupling or other restriction may be installed
in the discharge line. The discharge line must be a
minimum of 4" above a drain and installed such that it
allows complete drainage of both the PRV and the line.
The discharge line must be placed where it will not
cause any damage.
The location of the PRV must be readily accessible for
servicing or replacement, and be mounted as close to
the water heater as possible. See Fig. 28. To install the
PRV, a suitable fitting connected to an extension on a
“T” fitting can be sweated to the hot water line.
Support all piping.
Fig. 28 Plumbing Connections (with isolation valves)
and Pressure Relief Valve
Description Max. Levels
pH pH 6.5 - 8.5
TDS (total Dissolved
Solids)
mg/l or ppm 500
Total hardness mg/l or ppm
100
(6 grains)
Aluminum mg/l or ppm 2.0
Chlorides mg/l or ppm 250
Copper mg/l or ppm 1.0
Iron mg/l or ppm 0.3
Manganese mg/l or ppm 0.05
Zinc mg/l or ppm 5.0
Table 13
Warning:
In applications where inlet water
temperature can exceed 140°F (60ºC), a
thermostatic or mixing valve must be
installed before the appliance to prevent
water exceeding 140°F (60°C) from
entering the appliance.
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