| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | William COOKE | 11 | South Lincs Competitive SC | 7:49.57 |
| 2 | 3 | Toby BROWN | 11 | Deepings SC | 6:49.71 |
| 3 | 5 | Bertie ROSE | 10 | Lincoln Vulcans SC | 6:40.94 |
| 4 | 4 | Oscar DURHAM | 10 | Bassetlaw Swim Squad | 6:42.00 |
| 5 | 2 | Michael SCOTT | 14 | South Lincs Competitive SC | 7:13.77 |
| Heat Number - 2 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Noeh SMITH | 10 | Bassetlaw Swim Squad | 6:19.83 |
| 2 | 9 | Reid HUTCHINS | 9 | Bassetlaw Swim Squad | 6:15.32 |
| 3 | 11 | Kieran LUCY | 13 | South Lincs Competitive SC | 5:37.00 |
| 4 | 10 | Alfie GROUNSELL | 11 | Bassetlaw Swim Squad | 6:05.99 |
| 5 | 8 | Stanley THURLOW | 11 | Lincoln Vulcans SC | 6:17.40 |
| 6 | 6 | Oscar WOOD | 10 | Lincoln Vulcans SC | 6:30.00 |
| Heat Number - 3 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 13 | Kieron TOMS | 13 | Deepings SC | 5:28.76 |
| 2 | 15 | Oliver WILKINSON | 11 | Lincoln Vulcans SC | 5:21.05 |
| 3 | 17 | Ben ALLISTON | 14 | Deepings SC | 5:03.21 |
| 4 | 16 | Aaron SADLER | 14 | South Lincs Competitive SC | 5:18.71 |
| 5 | 14 | Joshua GILL | 20 | Gainsborough Dolphins SC | 5:27.39 |
| 6 | 12 | Reuben OWEN | 13 | South Lincs Competitive SC | 5:36.77 |
| Heat Number - 4 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 19 | William VERE | 15 | South Lincs Competitive SC | 4:45.97 |
| 2 | 21 | Morgan FARRAR | 14 | City of Linc Pentaqua SC | 4:33.75 |
| 3 | 23 | Rico BRINGEMAN | 18 | South Lincs Competitive SC | 4:07.09 |
| 4 | 22 | Alex SADLER | 17 | South Lincs Competitive SC | 4:15.30 |
| 5 | 20 | Archie FRENCH | 14 | Lincoln Vulcans SC | 4:43.00 |
| 6 | 18 | James CASH | 13 | Deepings SC | 4:50.43 |