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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.
Fig. 30 Flow/temperature charts
Hot Water Flow and Temperature with Various Inlet Temperature (lpm/Celsius)
0.00
4.00
8.00
12.00
16.00
20.00
24.00
35 40 45 50 55 60 65
Hot water temperature (ºC)
Hot Water Flow (l/min)
Inlet (ºC) 4 Inlet (ºC) 10 Inlet (ºC) 16 Inlet (ºC) 21
Hot Water Flow and Temperature with Various Inlet Temperature (gpm/Fahrenheit)
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
90 100 110 120 130 140 150
Hot water temperature (ºF)
Hot Water Flow (GPM)
Inlet (ºF) 40 Inlet (ºF) 50 Inlet (ºF) 60 Inlet (ºF) 70
Programming the heater to display temperature readings in Celsius is possible, contact BBTNA for instruction.