EVENT 609 Open/Male 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Evan Larthe | 16 | Basildon Ph | 9:14.27 |
| 4 | 3 | Ethan Wallis | 15 | Norwich Swan | 9:08.97 |
| 5 | 2 | Oliver Fuller | 15 | Co Cambridge | 9:12.60 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | Luke Owens | 15 | Putteridge | 9:08.50 |
| 2 | 6 | Ryan Wimpenny | 15 | Cheshunt | 9:05.30 |
| 3 | 8 | Csanad Rehus | 16 | Co Peterboro | 8:54.90 |
| 4 | 10 | Oliver Fenwick | 16 | Hatfield | 8:53.50 |
| 5 | 9 | Xavier Zerban | 14 | Biggleswade | 8:54.60 |
| 6 | 7 | Perrin Ma | 14 | Hatfield | 8:57.20 |
| 7 | 5 | Jed Millin | 17 | Stowmarket | 9:05.62 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 12 | Daniel Moyses | 19 | Co Peterboro | 8:51.40 |
| 2 | 14 | George Hooper | 18 | Co St Albans | 8:42.38 |
| 3 | 16 | Conor Mint | 16 | Basildon Ph | 8:32.21 |
| 4 | 18 | Daniel Belsey | 17 | Hatfield | 8:22.63 |
| 5 | 17 | Robert Fenner | 17 | Basildon Ph | 8:30.80 |
| 6 | 15 | Luke Martell | 19 | Watford SC | 8:33.61 |
| 7 | 13 | George Carter | 17 | Co Cambridge | 8:46.56 |
| 8 | 11 | Ethan Knights | 14 | teamipswich | 8:51.40 |