Baxi Boilers Duo Tec Range. · Duo Tec 24 HE –GC No. 47-075-23. · Duo Tec 24 HE A (Before Serial No. BTG0815 Issue 9) –GC No. 47-075-35 BEFORE. · Duo Tec 28 HE –GC No. 47-075-25. · Duo Tec 28 HE A (Before Serial No. ).
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