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 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
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 Flow and Temperature with Various Inlet Temperature (lpm/Celsius)
40
45
120
130
Inlet (ºF) 60
Inlet (ºF) 70
50
55
Inlet (ºC) 16
140
60
Inlet (ºC) 21
6 720 607 072
150
65