EVENT 206 Boy Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Finlay SMITH | 13 | Deepings | 7:15.00 |
| 3 | 4 | Oliver KEENS | 12 | Rotherham Mo | 6:44.20 |
| 4 | 3 | Oliver SHEPHERD | 12 | Deepings | 6:50.00 |
| 5 | 1 | Joe BLACK | 11 | Deepings | 7:45.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Max MARSHALL | 12 | Matlock | 5:56.46 |
| 2 | 8 | Finlay BIRD | 11 | Derventio | 5:42.50 |
| 3 | 10 | James THOMAS | 11 | Gainsborough | 5:28.84 |
| 4 | 9 | Oscar GAVELLE | 12 | Rotherham Mo | 5:40.21 |
| 5 | 7 | Harry OSBORNE | 10 | Rotherham Mo | 5:55.00 |
| 6 | 5 | Samuel POTTER | 12 | Bassetlaw SS | 6:00.01 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 12 | Niall MAGUIRE | 15 | Newcastle St | 5:20.19 |
| 2 | 14 | Zachary DRAYSON | 12 | Derventio | 5:17.75 |
| 3 | 16 | Joshua BOOTH | 13 | Rotherham Mo | 5:09.07 |
| 4 | 15 | William BLAINEY | 13 | Newcastle St | 5:16.42 |
| 5 | 13 | Joseph DAVIES | 13 | Rotherham Mo | 5:19.17 |
| 6 | 11 | Owen RAFFERTY | 13 | Bassetlaw SS | 5:25.40 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | William DURRANS | 14 | Rotherham Mo | 5:04.50 |
| 2 | 20 | Oliver STONE | 13 | Derventio | 4:45.47 |
| 3 | 22 | Jack FINNIE | 14 | Rotherham Mo | 4:37.40 |
| 4 | 21 | Seth HINITT | 15 | Bassetlaw SS | 4:39.97 |
| 5 | 19 | Lewis FOX | 15 | Rotherham Mo | 4:53.69 |
| 6 | 17 | Evan JOHNSON | 12 | Derventio | 5:08.20 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 24 | Archie HERON | 15 | Derventio | 4:34.69 |
| 2 | 26 | Harry CARDELL | 17 | Deepings | 4:28.32 |
| 3 | 28 | Samuel LITTLER | 18 | Derventio | 4:09.25 |
| 4 | 27 | Alexander HARRAND | 16 | Derventio | 4:20.04 |
| 5 | 25 | Oliver OSBORNE | 14 | Derventio | 4:31.05 |
| 6 | 23 | Leo ALLANSON | 15 | Derventio | 4:34.86 |