EVENT 514 Mens Open 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 2 | Daniel Cox | 14 | Wycombe Dist | 9:12.19 |
| 2 | 4 | Noah Jameson Neal | 14 | Killerwhales | 9:10.44 |
| 3 | 6 | Samuel Ridgley | 14 | Dulwich Dolp | 9:09.30 |
| 4 | 8 | Max Adams | 14 | Co Salford | 9:08.62 |
| 5 | 7 | Joe Cooper | 14 | teamipswich | 9:08.87 |
| 6 | 5 | Henry Maw | 14 | Southport | 9:09.36 |
| 7 | 3 | Deen Ahmed | 14 | Solihull | 9:11.31 |
| 8 | 1 | James Woods | 14 | Middlesboro | 9:15.07 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 10 | Thomas Deffains | 14 | TigersJersey | 9:06.88 |
| 1 | 12 | Matthew Woodhall | 14 | Co Sheffield | 9:03.31 |
| 2 | 14 | Isaac Dodds | 14 | TigersJersey | 9:02.19 |
| 3 | 16 | Jack Gartside | 15 | Northampton | 8:59.59 |
| 4 | 18 | Ethan Sutcliffe | 15 | Co Leeds | 8:58.08 |
| 5 | 17 | Samuel Tucker | 14 | Wycombe Dist | 8:59.53 |
| 6 | 15 | Adam Banks | 15 | Derventio | 9:00.11 |
| 7 | 13 | Patrick Meggitt | 30 | Co Hereford | 9:02.45 |
| 8 | 11 | James McGregor | 14 | Perth City | 9:05.56 |
| 9 | 9 | Chester Leeming | 14 | St Felix Sch | 9:08.37 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 20 | Ellis Stanhope | 16 | Sevenoaks | 8:57.85 |
| 1 | 22 | Elijah Kendrick | 14 | Shiverers | 8:56.87 |
| 2 | 24 | Thomas Davidson | 16 | Wolv'hampton | 8:56.05 |
| 3 | 26 | Jack Muncey | 15 | Perth City | 8:54.17 |
| 4 | 28 | Angus Allison | 15 | Warrender Ba | 8:51.73 |
| 5 | 27 | Toby Stewart | 15 | Guildford Ct | 8:52.40 |
| 6 | 25 | Thomas Owens | 19 | Barnes SC | 8:54.26 |
| 7 | 23 | Callum Rushan | 16 | Leek | 8:56.11 |
| 8 | 21 | Ben Penhale | 15 | TauntonDeane | 8:57.75 |
| 9 | 19 | Thomas Sansome | 15 | Wycombe Dist | 8:57.99 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 30 | Charley Langford | 15 | Thanet Swim | 8:50.63 |
| 1 | 32 | Liam McLaughlin | 16 | Warrender Ba | 8:49.65 |
| 2 | 34 | Joseph Kingsland | 15 | Nova Cent'n | 8:47.45 |
| 3 | 36 | Daniel Donovan | 15 | Guildford Ct | 8:45.79 |
| 4 | 38 | Jevon Penny | 15 | Northampton | 8:45.70 |
| 5 | 37 | Samuel Blackett | 20 | Northampton | 8:45.75 |
| 6 | 35 | Joseph Deighan | 15 | Stockport Mo | 8:46.69 |
| 7 | 33 | Oliver Duckworth | 16 | Grimsby AST | 8:49.39 |
| 8 | 31 | Joshua Fowles | 19 | Witham Dolph | 8:49.76 |
| 9 | 29 | Lewis Binning | 15 | Basildon Ph | 8:50.82 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 40 | Timothy Leberl | 16 | Beckenham | 8:42.81 |
| 1 | 42 | Daniel Johnson | 16 | Royal Wolv | 8:41.12 |
| 2 | 44 | Myles Turner | 18 | West Suffolk | 8:40.22 |
| 3 | 46 | Archie Plowman | 17 | Northampton | 8:39.61 |
| 4 | 48 | Marcus Johnson | 19 | Co Milton K | 8:39.16 |
| 5 | 47 | Benjamin Prosser | 18 | Wycombe Dist | 8:39.27 |
| 6 | 45 | Joshua Williams | 16 | Wycombe Dist | 8:39.67 |
| 7 | 43 | Adam Hall | 17 | Tewkesbury | 8:40.57 |
| 8 | 41 | Jackson O'Rourke | 16 | Northampton | 8:41.80 |
| 9 | 39 | Ross Philp | 16 | Staines | 8:43.18 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 50 | Jacob Butterfield | 18 | Co Leeds | 8:38.97 |
| 1 | 52 | Scott Provan | 17 | Co Salford | 8:37.92 |
| 2 | 54 | Edward Mildred | 15 | Northampton | 8:37.38 |
| 3 | 56 | Liam Snook | 20 | Northampton | 8:37.09 |
| 4 | 58 | Max Jelfs | 17 | Hatfield | 8:35.54 |
| 5 | 57 | Daniel Ferguson | 17 | West Lothian | 8:36.28 |
| 6 | 55 | Thomas Beamer | 16 | Co Leicester | 8:37.29 |
| 7 | 53 | Alexander Hindle | 16 | Co Birm'ham | 8:37.38 |
| 8 | 51 | George Barber | 17 | Royal Wolv | 8:38.25 |
| 9 | 49 | Henry Pearce | 16 | Co Peterboro | 8:39.13 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 60 | Myles Robinson-Young | 16 | Co Peterboro | 8:35.43 |
| 1 | 62 | Ewan Wilson | 16 | Co Salford | 8:34.38 |
| 2 | 64 | Ross Hill | 21 | Loughboro Un | 8:32.88 |
| 3 | 66 | Casey Barrett | 19 | Royal Wolv | 8:28.56 |
| 4 | 68 | Charlie Poole | 17 | Co Leicester | 8:27.19 |
| 5 | 67 | Hector Pardoe | 17 | Ellesmere Co | 8:28.43 |
| 6 | 65 | John Wright | 21 | Aberdeen Per | 8:31.88 |
| 7 | 63 | Harley Beentjes | 18 | Wigan BEST | 8:34.14 |
| 8 | 61 | Ciaran Thomas | 16 | Newcastle | 8:34.55 |
| 9 | 59 | Bailey Hairsine | 19 | Co Manch Aq | 8:35.48 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 70 | Adam Wilson | 17 | Newcastle | 8:25.33 |
| 1 | 72 | Nathan Wells | 20 | Loughboro Un | 8:21.85 |
| 2 | 74 | Samuel Osborne | 17 | Co Birm'ham | 8:18.19 |
| 3 | 76 | William Bell | 16 | Co Leicester | 8:16.86 |
| 4 | 78 | Luke Turley | 18 | Hatfield | 8:10.21 |
| 5 | 77 | Jakob Goodman | 18 | Millfield | 8:15.60 |
| 6 | 75 | William Ryley | 20 | Bath Univ | 8:17.00 |
| 7 | 73 | Samuel Budd | 20 | Co Sheffield | 8:19.14 |
| 8 | 71 | Ryan Reader | 20 | Derventio | 8:23.01 |
| 9 | 69 | Jamie Scholes | 18 | Co Peterboro | 8:25.41 |