Bosch AquaStar 250SX NG Manual page 22

Operation instructions
Setting the water temperature
The desired temperature of the hot water can be adjusted on the front control panel of the heater.
The 250 SX has an electronically controlled gas valve that modulates the burner input in response to both varying
hot water flow rates and/or changes in any incoming and outgoing water temperatures.
Hot Water Flow and Temperature with Various Inlet Temperature (gpm/Fahrenheit)
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0.00
90
Inlet (ºF) 40
24.00
20.00
16.00
12.00
8.00
4.00
0.00
35
Programming the heater to display temperature readings in Celsius is possible, contact BBTNA for instruction.
Fig. 30 Flow/temperature charts
22
100 110
Hot water temperature (ºF)
Inlet (ºF) 50
Hot Water Flow and Temperature with Various Inlet Temperature (lpm/Celsius)
40 45
Hot water temperature (ºC)
Inlet (ºC) 4 Inlet (ºC) 10
120 130
Inlet (ºF) 60 Inlet (ºF) 70
50 55
Inlet (ºC) 16
140
60
Inlet (ºC) 21
6 720 607 057
150
65