EVENT 102 Open/Male 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Jack Friedlein | 16 | Maldon Shark | 18:04.04 |
| 4 | 4 | Charlie Cunningham | 15 | Biggleswade | 18:02.04 |
| 5 | 3 | Oliver Fenwick | 15 | Hatfield | 18:03.30 |
| 6 | 1 | Oliver Fuller | 14 | Co Cambridge | 18:09.20 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Isaac Buchan | 15 | Co Norwich | 17:52.36 |
| 2 | 8 | Csanad Rehus | 15 | Co Peterboro | 17:39.83 |
| 3 | 10 | William Hughes | 14 | Basildon Ph | 17:34.42 |
| 4 | 12 | Daniel Williams | 16 | Hatfield | 17:17.84 |
| 5 | 11 | Adam O'Neal | 16 | Bedford SS | 17:28.20 |
| 6 | 9 | Lucas Day | 15 | Rochford | 17:38.13 |
| 7 | 7 | Jamie Wilson | 15 | West Norfolk | 17:45.40 |
| 8 | 5 | Ashton Blake | 15 | Basildon Ph | 18:00.50 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | Jacob Bacon | 14 | Co Peterboro | 17:07.66 |
| 2 | 16 | B Macdonald-Williams | 16 | Bishop Stort | 17:01.13 |
| 3 | 18 | Patch Robinson | 17 | teamipswich | 16:31.50 |
| 4 | 20 | Ryan Wall | 17 | Co Cambridge | 16:13.94 |
| 5 | 19 | Daniel Belsey | 16 | Hatfield | 16:26.33 |
| 6 | 17 | Conor Mint | 15 | Basildon Ph | 16:54.50 |
| 7 | 15 | Luke Martell | 18 | Watford SC | 17:03.90 |
| 8 | 13 | Frank Lamb | 15 | Co Peterboro | 17:15.51 |