EVENT 304 Open/Male 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Kristians Kupcovs | 16 | Daventry | 19:12.66 |
| 2 | 4 | Samuel Cooper | 16 | Long Eaton | 19:10.77 |
| 3 | 6 | Oliver Shepherd | 16 | Deepings | 18:40.60 |
| 4 | 8 | Arlo Hems Gillson | 14 | Repton | 18:27.20 |
| 5 | 7 | Harry Callaghan-Wetton | 13 | Nova Cent'n | 18:28.40 |
| 6 | 5 | Noah Dewsnap | 14 | Bassetlaw SS | 18:45.63 |
| 7 | 3 | Harry Thomas | 15 | DerbyPhoenix | 19:10.80 |
| 8 | 1 | Oscar Venn | 13 | Northampton | 19:19.20 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | William Kite | 16 | Louth | 17:55.60 |
| 2 | 12 | Kais Alhijazi | 14 | Co Leicester | 17:47.00 |
| 3 | 14 | James Cash | 15 | Deepings | 17:38.47 |
| 4 | 16 | Isaac Ebanks | 15 | Derby Excel | 17:29.83 |
| 5 | 15 | David Bielawski | 16 | Northampton | 17:38.10 |
| 6 | 13 | Riley Woodward | 16 | Northampton | 17:43.10 |
| 7 | 11 | Edward Gregory | 13 | Repton | 17:50.30 |
| 8 | 9 | Tyler Shaw | 14 | Derby Excel | 17:57.68 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | William Oxley | 15 | Co Leicester | 16:43.82 |
| 2 | 20 | Jacson Crabb | 14 | Co Leicester | 16:35.37 |
| 3 | 22 | David Coyle | 20 | Nova Cent'n | 16:21.85 |
| 4 | 24 | Daniel Walker | 18 | Nova Cent'n | 16:01.71 |
| 5 | 23 | Luke Moore | 18 | Lboro Uni | 16:12.79 |
| 6 | 21 | Samuel Green | 15 | Bassetlaw SS | 16:28.15 |
| 7 | 19 | Benjamin Mould | 20 | Lboro Uni | 16:41.60 |
| 8 | 17 | Joel Harby | 16 | Nova Cent'n | 16:45.90 |