EVENT 102 Open/Male 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Oliver Meier | 15 | Biggleswade | 18:12.16 |
| 2 | 3 | Kye Harrington | 17 | West Norfolk | 18:11.71 |
| 3 | 5 | Alexander Gaydon | 15 | Chelmsford | 18:06.00 |
| 4 | 7 | Ethan Knights | 14 | teamipswich | 17:58.80 |
| 5 | 6 | George Saunders | 15 | Co St Albans | 18:04.29 |
| 6 | 4 | William Barr | 17 | Royston | 18:11.68 |
| 7 | 2 | Charlie Birdsall | 15 | Co Cambridge | 18:11.80 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 9 | Max Lesner | 16 | Potters Bar | 17:57.86 |
| 2 | 11 | Alfie Page | 16 | Co Cambridge | 17:48.95 |
| 3 | 13 | Kian Ptolomey | 15 | Putteridge | 17:45.40 |
| 4 | 15 | Oliver Fuller | 15 | Co Cambridge | 17:40.84 |
| 5 | 14 | Lochlan Shaw | 15 | Flitwick | 17:42.10 |
| 6 | 12 | Ethan Wallis | 15 | Norwich Swan | 17:46.70 |
| 7 | 10 | Jed Millin | 17 | Stowmarket | 17:50.10 |
| 8 | 8 | Alexander Ball | 18 | Potters Bar | 17:58.71 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 17 | Janos Csepely | 14 | teamipswich | 17:22.00 |
| 2 | 19 | Ben Howlett | 18 | Deben | 17:21.40 |
| 3 | 21 | Perrin Ma | 14 | Hatfield | 17:13.00 |
| 4 | 23 | Daniel Moyses | 19 | Co Peterboro | 17:01.20 |
| 5 | 22 | Oliver Fenwick | 16 | Hatfield | 17:01.33 |
| 6 | 20 | Ryan Wimpenny | 15 | Cheshunt | 17:17.54 |
| 7 | 18 | Will Riley | 16 | teamipswich | 17:21.60 |
| 8 | 16 | Lucas Day | 16 | Rochford | 17:37.28 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 25 | George Carter | 17 | Co Cambridge | 16:54.30 |
| 2 | 27 | Csanad Rehus | 16 | Co Peterboro | 16:46.10 |
| 3 | 29 | George Hooper | 18 | Co St Albans | 16:29.62 |
| 4 | 31 | Robert Fenner | 17 | Basildon Ph | 16:19.80 |
| 5 | 30 | Adam O'Neal | 17 | Bedford SS | 16:28.36 |
| 6 | 28 | Luke Martell | 19 | Watford SC | 16:42.61 |
| 7 | 26 | Luke Owens | 15 | Putteridge | 16:51.30 |
| 8 | 24 | Jamie Wilson | 16 | West Norfolk | 16:55.50 |