| Core Gas Safety |
CCN1 |
| Central Heating Boilers |
CEN1 |
| Cookers |
CKR1 |
| Cooker Boilers |
CKHB1 |
| Ducted Air Heaters |
DAH1 |
| Forced Draft Burners |
DFDA1 |
| Space Heaters |
HTR1 |
| Swimming Poool Boilers |
HWB1 |
| Domestic Laundry Appliances |
LAU1 |
| Leisure Equipment |
KEI1 |
| Meters up to U6 (6m3) |
MET1 |
| Instantaneous Water Heaters |
WAT1 |
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