Water Connections; Water Quality - Bosch AquaStar GWH 2700 ES NG Manual

Installation instructions
3.9

Water connections

Warning: This heater is not approved
for preheated water applications.
See chapter 3.11
recirculating application.
B When facing the heater, the ¾" cold connection is on
the bottom right and the hot connection is on the
bottom left. Centrally locating the water heater is
recommended to keep hot water distribution times
even throughout the structure.
COLD
HOT
Fig. 28
B The use of unions when connecting both water
pipes to the inlet and outlet connections is
required. This will facilitate any necessary
servicing.
B Plastic or PEX type plumbing line materials are not
suitable for connecting directly to the water heater.
B Although water piping throughout the building may
be other than copper, we recommend that copper or
suitably rated stainless steel flex line piping be used
for the water connections for 1.5' on either side of
the water heater (follow local codes if more
stringent).
B Never sweat any piping directly to or beneath
the water connections, as damage can occur to
the internal water valve from heating of the
pipe.
B Keep water inlet and outlet pipes to no less
than ¾" (19.05mm) diameter to allow the full
flow capacity.
B If the cold and hot connections to the heater are
reversed, the heater will not function. Be certain there
are no loose particles or dirt in the piping. Blow out
or flush the lines before connecting to the water
heater.
B Full port shutoff valves should be installed on both
the cold water supply and hot water outlet lines to
facilitate servicing the heater (see Fig. 29).
B For installation on a private well system with the use
of a pressure tank, the lowest pressure range setting
recommended is 40-60 psi (2.75 and 4.15 bar).
20
for approved

3.10 Water quality

Water quality can have an impact on appliance
longevity and may not be covered under 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.
Description
pH
TDS (total Dissolved
Solids)
Total hardness
Aluminum
Chlorides
Copper
Iron
Manganese
Zinc
Table 9
Max. Levels
pH 6.5 - 8.5
mg/l or ppm 500
100
mg/l or ppm
(6 grains)
mg/l or ppm 2.0
mg/l or ppm 250
mg/l or ppm 1.0
mg/l or ppm 0.3
mg/l or ppm 0.05
mg/l or ppm 5.0
6 720 608 542