PCB 7690358. Part No.7690358. Potterton Heatmax Combi 24 HE (GC No. 47-393-27). Potterton Gold 24 HE A (GC No. 47-393-18)From Serial No's starting BMX0815 and all starting GNH. Potterton Gold ErP Gold Combi ErP 24 (GC No. 47-393-43).
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