| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Austin Moore | 12 | BelperMarlin | 4:05.44 |
| 4 | 4 | Freddie Morgan | 10 | Repton | 4:00.90 |
| 5 | 3 | Oliver Baird | 11 | Repton | 4:00.90 |
| 6 | 1 | Oscar Wilson | 11 | BelperMarlin | 4:30.00 |
| Heat Number - 2 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 5 | Jiaqi Zhou | 9 | DerbyPhoenix | 4:00.00 |
| 3 | 7 | Lucas Ferreira | 10 | DerbyPhoenix | 3:45.00 |
| 4 | 9 | Maxwell Cooper | 11 | Long Eaton | 3:32.02 |
| 5 | 8 | Charlie McInnes | 12 | Dronfield | 3:40.00 |
| 6 | 6 | Archie Dean | 12 | Etwall | 3:56.08 |