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BW 105 BW 126 BW 140
BW 168 BW 175 BW 210
BW 245 BW 91
In the model designation for the heater the structure is as follows:
BW[4,5][B,R]AH000[091-245]AAAA.

[4,5]: 4=without tankless coil, 5=with 3.7 GPM tankless coil
[B,R]: B=Beckett oil burner, R=Riello oil burner