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7
Domestic water heaters
Minimum pump performance
This is based on heating potable water with a hardness of
5 to 25 grains per gallon and/or total dissolved solids not
exceeding 350 ppm. See Water Chemistry, page 56.
TABLE 7D
Water Heater Pump Applications
Pipe
Water
Grundfos
Model
Size
Hardness
5 to 15 gpg
TP44PAB
497
2"
15 to 20 gpg UP 43-110 SF
5 to 15 gpg
TP44PAB
647
2"
15 to 20 gpg UP 43-110 SF
5 to 15 gpg
TP44PAB
747
2"
15 to 20 gpg UP 43-110 SF
5 to 15 gpg
TP24PAB
987
2-1/2"
15 to 20 gpg TP 50-160/2B
5 to 15 gpg
TP24PAB
1257
2-1/2"
15 to 20 gpg TP 50-160/2B
5 to 15 gpg
TP24PAB
1437
2-1/2"
15 to 20 gpg TP 50-160/2B
5 to 15 gpg
TP24PAB
1797
2-1/2"
15 to 20 gpg TP 50-160/2B
5 to 15 gpg
TP24PAB
2067
2-1/2"
15 to 20 gpg TP 50-160/2B
Heat exchanger
On all models, header inspection plugs can be removed for
field inspection and cleaning of copper tubes. The entire
heat exchanger may be easily removed from the unit.
Flow
Head
Temp.
Rate
Loss
Pump
Rise
(GPM)
(FT)
55
10
15°F
75
10
11°F
55
10
19°F
75
10
14°F
55
10
22°F
75
10
16°F
90
15
18°F
115
15
14°F
90
15
23°F
115
15
18°F
90
15
26°F
115
15
21°F
90
15
32°F
115
15
26°F
90
15
37°F
115
15
30°F
Installation & Service Manual
(continued)
Potable
hot
water
control settings
Domestic water temperature
You must take adequate care to prevent
⚠ WARNING
scald injury when storing water at elevated
temperatures for domestic use.
This unit has an adjustable temperature control to maintain the
desired water temperature set point. See Setting Temperature
Control, page 41, for instructions to adjust the temperature
control. The temperature control is factory preset at
approximately 125°F (52°C) or less. Households with small
children or invalids may require 120°F (49°C) or lower
temperature hot water to reduce risk of scald injury.
Operate this high efficiency hot water heater at a temperature
setting high enough to prevent condensing of the products of
combustion on the unit's heat exchanger or in the attached
venting system. A water temperature setting that is above the
dew point of the gas combustion products should prevent
condensate formation
To guard against scald injury, you must use a
⚠ WARNING
properly sized thermostatic mixing valve to
supply domestic hot water at temperatures
less than 125°F (52°C).
Return water temperatures must not be less
⚠ WARNING
than 140°F (60°C). If lower return water
temperatures are required, follow the
instructions for Low Temperature Return
Water Systems, page 32.
temperature
57
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