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 GWH-635-ES 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 (GPM)

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

100

110

120

 

130

140

150

 

 

 

 

Hot water temperature (ºF)

 

 

 

 

 

 

 

 

Inlet (ºF) 40

 

Inlet (ºF) 50

 

Inlet (ºF) 60

 

 

 

 

Inlet (ºF) 70

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hot Water Flow and Temperature with Various Inlet Temperature (lpm/Celsius)

 

24.00

 

 

 

 

 

 

(l/min)

20.00

 

 

 

 

 

 

16.00

 

 

 

 

 

 

Flow

 

 

 

 

 

 

 

 

 

 

 

 

 

Water

12.00

 

 

 

 

 

 

 

 

 

 

 

 

 

Hot

8.00

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4.00

 

 

 

 

 

 

 

0.00

 

 

 

 

 

 

 

35

40

45

50

55

60

65

Hot water temperature (ºC)

Inlet (ºC) 4

 

Inlet (ºC) 10

 

Inlet (ºC) 16

 

 

Inlet (ºC) 21

Fig. 29 Flow/temperature charts

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Bosch Appliances GWH-635-ES manual Operation instructions Setting the water temperature, Flow/temperature charts