| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | George LEONARD | 11 | Grantham | |
| 3 | 2 | Samuel NICHOLS | 11 | Grantham | |
| 4 | 3 | Fabian KOLASA | 12 | Grantham | |
| 5 | 5 | Ben CARLYLE | 13 | Grantham | |
| 6 | 6 | Thomas HILLSON | 10 | Grantham | |
| Heat Number - 2 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Thomas KINNEAR | 13 | Grantham | |
| 2 | 10 | Jack ZERAVICA | 15 | Grantham | 5:48.90 |
| 3 | 12 | Jacob FISH | 14 | Grantham | 5:16.29 |
| 4 | 14 | Owen HATHWAY | 17 | Grantham | 4:54.70 |
| 5 | 13 | Zach HOPKINSON | 14 | Grantham | 5:11.28 |
| 6 | 11 | Daniel DEGNAN | 15 | Grantham | 5:21.12 |
| 7 | 9 | Oscar DURANT | 12 | Grantham | 6:27.04 |
| 8 | 7 | Joshua KIM | 11 | Grantham | |