Baxi 105 HE A Instant - 47-075-50. Baxi Duo Tec 24 HE - 47-075-23. Baxi Duo Tec 28 HE - 47-075-25. Baxi Duo Tec 28 HE A (After Serial No.CAC0929 Issue 9) - 47-075-36. Baxi Duo Tec 28 HE A (Before Serial No.CAC0929 Issue 9) - 47-075-36 BEFORE.
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