10
Overall view
1.Main heat exchanger
2.Flue gas temperature sensor
3.Syphon
4.Heating temperature sensor
5.Electric box
6.Timer
7.Fan
8.Gas/air mixed burner
9.Air inlet pipe (burner)
10.Expansion tank
11.Heating water temperature sensor
12.Drain point
13.Pressure gauge
14.Overheat protector
15.Ignition needle
16.Burner
17.Flame detection needle
18.Three way motor
19.Domestic heat exchanger
20.Gas valve
21.Pressure switch
22.Hot water temperature sensor
23.Water ow volume sensor
24.Safety valve
25.Air exhaust valve
26.Pump
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