EVENT 307 Mens Open 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Ellis Stanhope | 15 | Sevenoaks | DN:C . |
| 1 | 4 | Joshua Skinner | 14 | Nova Cent'n | 17:38.20 |
| 2 | 6 | Ryan Wilcox | 15 | Nova Cent'n | 17:30.03 |
| 3 | 8 | Charley Langford | 14 | Thanet Swim | 16:58.94 |
| 4 | 10 | Oliver Fairman | 15 | Poole | DN:C . |
| 5 | 9 | Joey Tippin | 14 | Co Leicester | 17:17.32 |
| 6 | 7 | Oliver Duckworth | 15 | Grimsby AST | 16:57.96 |
| 7 | 5 | Jack Price | 15 | Chesterfield | 17:26.54 |
| 8 | 3 | Joel Donald | 15 | Stockport Mo | 17:33.56 |
| 9 | 1 | Matthew Smith | 15 | Northampton | 17:51.21 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Jevon Penny | 14 | Northampton | 17:04.04 |
| 1 | 14 | Benjamin Foster | 15 | Stockport Mo | 17:04.59 |
| 2 | 16 | Joseph Deighan | 14 | Stockport Mo | 16:46.72 |
| 3 | 18 | Henry Pearce | 15 | Co Peterboro | 16:38.00 |
| 4 | 20 | Pierce Greening | 14 | Cockermouth | 16:58.49 |
| 5 | 19 | Jackson O'Rourke | 15 | Northampton | 17:04.27 |
| 6 | 17 | Timothy Leberl | 15 | Beckenham | 16:42.40 |
| 7 | 15 | Ewan Wilson | 15 | Co Salford | 16:54.44 |
| 8 | 13 | Joshua Williams | 15 | Wycombe Dist | 16:44.82 |
| 9 | 11 | Daniel Donovan | 14 | Guildford Ct | 17:02.21 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 22 | Joseph Kingsland | 14 | Nova Cent'n | 16:42.86 |
| 1 | 24 | Ciaran Thomas | 15 | Newcastle | 16:34.40 |
| 2 | 26 | Archie Plowman | 16 | Northampton | 16:17.75 |
| 3 | 28 | Liam Snook | 19 | Northampton | 17:05.19 |
| 4 | 30 | Matthew Wright | 19 | Bath Univ | 16:26.60 |
| 5 | 29 | Hector Pardoe | 16 | Ellesmere Co | 16:31.45 |
| 6 | 27 | Casey Barrett | 18 | Royal Wolv | DN:C . |
| 7 | 25 | Elliot Sodeman | 19 | Laqua BEL | 16:20.61 |
| 8 | 23 | Pietro Forconi | 14 | Winchester | 17:22.01 |
| 9 | 21 | Alexander Hindle | 15 | Co Birm'ham | 16:26.87 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 32 | Harley Beentjes | 17 | Wigan BEST | 16:29.09 |
| 1 | 34 | Max Tambling | 18 | Hackney | 16:18.39 |
| 2 | 36 | Adam Wilson | 16 | Newcastle | 16:12.73 |
| 3 | 38 | Ross Hill | 20 | Loughboro Un | 16:20.15 |
| 4 | 40 | Jamie Scholes | 17 | Co Peterboro | 15:58.44 |
| 5 | 39 | William Ryley | 19 | Bath Univ | 16:13.19 |
| 6 | 37 | Ryan Reader | 19 | Derventio | 16:12.11 |
| 7 | 35 | Jacques Bonsell | 18 | Blackpool Aq | 16:21.01 |
| 8 | 33 | Alfie Kelly | 16 | Newcastle | 16:21.39 |
| 9 | 31 | Bailey Hairsine | 18 | Co Manch Aq | 16:47.45 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 42 | William Bell | 15 | Co Leicester | : . |
| 1 | 44 | Nathan Wells | 19 | Loughboro Un | : . |
| 2 | 46 | Kieran Bird | 18 | Millfield | : . |
| 3 | 48 | Tobias Robinson | 21 | Loughboro Un | : . |
| 4 | 50 | Tom Derbyshire | 19 | Bath Univ | : . |
| 5 | 49 | Jay Lelliott | 22 | Co Sheffield | : . |
| 6 | 47 | Samuel Budd | 19 | Co Sheffield | : . |
| 7 | 45 | Nathan Hughes | 17 | Hatfield | : . |
| 8 | 43 | Samuel Osborne | 16 | Co Birm'ham | : . |
| 9 | 41 | Max Murphy | 17 | Co Milton K | : . |