AquaStar 240 FX Installation And Owner's Manual page 22

Flow Rate and Temperature Rise with varying inlet water temperatures
The 240FX has been set at the factory to deliver 122º F (50º C) water. This is electronically controlled by the
computer in the heater.
The delivered hot water temperature will depend upon both the inlet water temperature and the hot water flow
rate, refer to the chart below. The 240FX has been set at the factory to raise the temperature of cold inlet water
from as low as 45 F degrees up to 122 F degrees (a 77 F degree rise). With 45 F degree inlet water the 240FX
can only reach 122 F for flows up to but not exceeding 3.5 gallons per minute (gpm). If the flow is more than 3.5
gpm or if the inlet water temperature is less then 45 F the degree rise will be less. The 240FX will target 122 F
or a 77 F maximum degree rise, whichever comes first.
If the inlet water temperature is warmer than 45 F degrees the 240FX will be able to reach 122 F degrees at
higher flow rates, for example if the inlet water temperature is 60 F degrees the 240 FX will produce 122 F
degrees up to a flow of 4.3 gpm.
Flow Rate
0.75
1
1.5
2
2.5
3.5
3.7
4
4.3
4.5
5
5.3
Inlet water temperature (F)
45 50 60
Outlet water temperature (F)
122 122 122
122 122 122
122 122 122
122 122 122
122 122 122
122 122 122
117 122 122
112 117 122
107 112 122
105 110 120
98 103 113
95 100 110
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