EVENT 144 Boy Open 200m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Harry Keeping | 10 | West Dorset | 4:11.44 |
| 3 | 4 | Theodore Stevens | 12 | Seagulls SC | 3:38.98 |
| 4 | 6 | Finlay Laws | 12 | S Bournem'th | 3:36.61 |
| 5 | 5 | Kaden Frampton | 12 | Seagulls SC | 3:36.78 |
| 6 | 3 | Frank Otton | 11 | Weymouth | 4:01.75 |
| 7 | 1 | Alexander Flint | 11 | Bourmth Coll | 4:14.32 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Sam King | 13 | Seagulls SC | 3:27.41 |
| 2 | 10 | Toby Beale | 13 | N Dorset SC | 3:25.32 |
| 3 | 12 | Sam Graham | 13 | Weymouth | 3:23.50 |
| 4 | 14 | Freddie George | 13 | N Dorset SC | 3:21.86 |
| 5 | 13 | Sullivan Bayliss | 13 | Poole | 3:23.47 |
| 6 | 11 | Louis Glover | 13 | Bourmth Coll | 3:24.67 |
| 7 | 9 | Nathan Ditchburn | 13 | Poole | 3:26.05 |
| 8 | 7 | Miron Wozniak | 13 | Poole | 3:27.51 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Scott Grocott | 13 | S Bournem'th | 3:20.18 |
| 2 | 18 | Philip Bernal-Mezzetti | 12 | Poole | 3:16.04 |
| 3 | 20 | C Bernal Mezzetti | 13 | Poole | 3:12.60 |
| 4 | 22 | Lucas Garel-Jones | 13 | S Bournem'th | 3:10.03 |
| 5 | 21 | Jack Palmer | 12 | Poole | 3:10.28 |
| 6 | 19 | Thomas Dewey | 14 | Seagulls SC | 3:14.45 |
| 7 | 17 | Connor Grocott | 12 | S Bournem'th | 3:19.12 |
| 8 | 15 | Ben Keeping | 13 | West Dorset | 3:20.82 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 24 | Jude McIlwain | 14 | Poole | 3:08.96 |
| 2 | 26 | Harry Pollard | 14 | Seagulls SC | 3:08.16 |
| 3 | 28 | Isaac Thring | 13 | Seagulls SC | 3:05.14 |
| 4 | 30 | Toby Carey | 14 | N Dorset SC | 3:03.91 |
| 5 | 29 | James Gunn | 14 | West Dorset | 3:04.99 |
| 6 | 27 | Wilfred Leigh | 13 | Blandford | 3:06.00 |
| 7 | 25 | Toby Lacey | 14 | S Bournem'th | 3:08.59 |
| 8 | 23 | Cameron Squire | 14 | Poole | 3:09.59 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 32 | Konner Burghart | 16 | S Bournem'th | 2:59.60 |
| 2 | 34 | Joshua Yip | 15 | Blandford | 2:58.05 |
| 3 | 36 | Joe O'Connor | 17 | Poole | 2:46.72 |
| 4 | 38 | Stephen Quine | 17 | Blandford | 2:41.45 |
| 5 | 37 | Frank Chappels | 15 | S Bournem'th | 2:44.41 |
| 6 | 35 | Oliver Slade | 16 | West Dorset | 2:50.29 |
| 7 | 33 | Leo Wisbey | 13 | Poole | 2:58.55 |
| 8 | 31 | Elliott Dunnett | 14 | S Bournem'th | 3:00.33 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 40 | Harry Davies | 19 | Seagulls SC | 2:40.62 |
| 2 | 42 | George Honor | 14 | Seagulls SC | 2:34.91 |
| 3 | 44 | Lawrence Elliott | 17 | Seagulls SC | 2:33.54 |
| 4 | 46 | Oliver Jones | 17 | Poole | 2:26.24 |
| 5 | 45 | Harry Stewart | 18 | West Dorset | 2:30.86 |
| 6 | 43 | Frederick Beasley | 15 | Poole | 2:34.44 |
| 7 | 41 | Sonny Chamberlain-Hyde | 19 | Seagulls SC | 2:38.19 |
| 8 | 39 | David Smith | 18 | S Bournem'th | 2:40.63 |