EVENT 304 Open/Male 100m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 2 | 2 | Oscar RICHARDSON | 15 | Poole | 1:55.94 |
| 3 | 4 | Sebastian SMITH | 13 | Poole | 1:50.56 |
| 4 | 3 | Andy DVORSKY | 15 | Poole | 1:53.61 |
| 5 | 1 | Sebastian LEE | 14 | Seagulls SC | 2:22.47 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 6 | Dylan JORDAN | 14 | Weymouth | 1:49.18 |
| 2 | 8 | Cooper STROHM | 15 | Poole | 1:41.45 |
| 3 | 10 | Ezra DOWDS | 15 | Seagulls SC | 1:36.77 |
| 4 | 9 | Oscar MACHTYLSKI | 15 | Poole | 1:38.82 |
| 5 | 7 | Franco HOWLETT | 15 | West Dorset | 1:42.23 |
| 6 | 5 | Finlay BOOTH | 14 | S Bournem'th | 1:49.57 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 12 | Felix WALKER | 13 | Poole | 1:36.12 |
| 2 | 14 | Maxwell BLAKE-EVENDEN | 13 | Weymouth | 1:35.44 |
| 3 | 16 | Ralph VEARNCOMBE | 14 | Poole | 1:30.12 |
| 4 | 15 | Tyler DOUGLAS | 11 | Blandford | 1:32.91 |
| 5 | 13 | Harry MORGAN | 13 | S Bournem'th | 1:35.82 |
| 6 | 11 | Luan ISUFI | 15 | Poole | 1:36.42 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 18 | Nikita KALININ | 10 | Wareham | 1:26.47 |
| 2 | 20 | Ethan WANG | 11 | S Bournem'th | 1:25.39 |
| 3 | 22 | Elliot DOWDS | 12 | Seagulls SC | 1:22.36 |
| 4 | 21 | Aron MOSS | 10 | S Bournem'th | 1:23.93 |
| 5 | 19 | Joseph SUTTON | 11 | Wareham | 1:26.37 |
| 6 | 17 | Freddie HOLLOWAY | 14 | Poole | 1:29.94 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 24 | Benjamin CRUMPLER | 11 | S Bournem'th | 1:18.80 |
| 2 | 26 | Miron WOZNIAK | 09 | Blandford | 1:16.35 |
| 3 | 28 | Frank TURNER | 11 | West Dorset | 1:14.63 |
| 4 | 27 | Dylan HANGER | 11 | Weymouth | 1:16.12 |
| 5 | 25 | Samuel ESCOTT | 10 | Poole | 1:17.47 |
| 6 | 23 | Harry KEEPING | 12 | Bridport Bar | 1:22.01 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 30 | Billy LEWIS | 10 | S Bournem'th | 1:12.64 |
| 2 | 32 | Liam DETRICK | 10 | S Bournem'th | 1:10.41 |
| 3 | 34 | Benjamin KEEPING | 09 | Bridport Bar | 1:09.29 |
| 4 | 33 | Kieran BARTON | 08 | Wareham | 1:09.66 |
| 5 | 31 | Oliver BUCK | 11 | N Dorset SC | 1:11.57 |
| 6 | 29 | Harry JOHNSON | 10 | Blandford | 1:12.99 |