| Fits Appliance(s) | | GC No. |
| 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 33 HE | - | 47-075-24 |
| Baxi Duo Tec 33 HE A (After Serial No.BTH1112 Issue 9) | - | 47-075-37 |
| Baxi Duo Tec 33 HE A (Before Serial No.BTH1112 Issue 8) | - | 47-075-37 BEFORE |
| Baxi Duo Tec 40 HE | - | 47-075-26 |
| Baxi Duo Tec 40 HE A (Issue 8) | - | 47-075-38 |
| Baxi Combi 33 HE | - | 47-075-22 |
| Baxi Platinum Combi 24 HE | - | 47-075-27 |
| Baxi Platinum Combi 28 HE | - | 47-075-28 |
| Baxi Platinum Combi 33 HE | - | 47-075-29 |
| Baxi Platinum Combi 33 HE A (After Serial No. BNE1112 Issue 5) | - | 47-075-33 |
| Baxi Platinum Combi 33 HE A (Before Serial No. BNE1112 Issue 6) | - | 47-075-33 BEFORE |
| Baxi Platinum Combi 40 HE | - | 47-075-30 |
| Baxi Platinum Combi 40 HE A (Issue 4) | - | 47-075-34 |
| Main 25 Eco Elite Post Serial Number MMH 1512 | - | 47-467-08 |
| Main 25 Eco Elite Pre Serial Number MMH 1512 | - | 47-467-08- |
| Main 28 System Eco Elite | - | 41-467-22 |
| Main 30 Eco Elite Post Serial Number MMH 1512 | - | 47-467-09 |
| Main 30 Eco Elite Pre Serial Number MMH 1512 | - | 47-467-09- |
| Main 28 System Eco | - | 41-467-12 |
| Main Combi 25 Eco | - | 47-467-01 |
| Main Combi 30 Eco | - | 47-467-03 |
| Potterton Apollo 30 | - | 47-393-37 |
| Potterton Gold 24 HE Combi | - | 47-590-05 |
| Potterton Gold 28 HE Combi | - | 47-590-06 |
| Potterton Gold 33 HE A Combi (After Serial No GNL1112) | - | 47-393-20 |
| Potterton Gold 33 HE A Combi (Before Serial No GNL1112) | - | 47-393-20 BEFORE |
| Potterton Gold 33 HE Combi | - | 47-590-19 |
| Potterton Gold System 28 HE A (After Serial No HSA1112) | - | 41-592-17 |
| Potterton Gold System 28 HE A (Before Serial No HSA1112) | - | 41-592-17 BEFORE |
| Potterton Heatmax Combi 33 HE (After Serial No FMN1112) | - | 47-393-29 |
| Potterton Heatmax Combi 33 HE (Before Serial No FMN1112) | - | 47-393-29 BEFORE |
| Potterton Promax Combi 24 HE Plus | - | 47-393-17 |
| Potterton Promax Combi 24 HE Plus A | - | 47-393-21 |
| Potterton Promax Combi 24 HE Plus LPG | - | 47-393-24 |
| Potterton Promax Combi 28 HE Plus | - | 47-590-04 |
| Potterton Promax Combi 28 HE Plus A | - | 47-393-22 |
| Potterton Promax Combi 33 HE Plus | - | 47-590-03 |
| Potterton Promax Combi 33 HE Plus A | - | 47-393-23 |
| Potterton Promax 32 HE Plus A System | - | 41-592-04 |
| Potterton Promax 32 HE Plus System | - | 41-591-93 |
| Potterton Titanium 33 | - | 47-393-41 |
| Potterton Titanium 40 | - | 47-393-42 |