EVENT 514 Mens Open 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 2 | 1 | Lewis Cottam | 14 | Stockport Mo | 9:09.25 |
| 3 | 3 | Sean McCann | 14 | Co Leicester | 9:06.54 |
| 4 | 5 | Rico Bringeman | 14 | Boston | 9:06.17 |
| 5 | 4 | Alexander Cooper | 13 | Wycombe Dist | 9:06.41 |
| 6 | 2 | Max Shaw | 14 | Co Milton K | 9:09.07 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 7 | Joshua O Brien | 14 | Co Cardiff | 9:02.65 |
| 1 | 9 | Liam Dawson | 14 | Nova Cent'n | 9:00.96 |
| 2 | 11 | Cameron Carlos | 14 | Barnet Copt | 8:59.44 |
| 3 | 13 | David Allen | 14 | Black Lion | 8:58.57 |
| 4 | 15 | Tyler Melbourne-Smith | 14 | Co Liverpool | 8:56.45 |
| 5 | 14 | Reece Grady | 14 | Stockport Mo | 8:57.62 |
| 6 | 12 | Luke Critchlow | 14 | Stockport Mo | 8:58.71 |
| 7 | 10 | William Baines | 14 | Bo Stockton | 9:00.24 |
| 8 | 8 | Oliver Burns | 14 | Wolv'hampton | 9:02.42 |
| 9 | 6 | Ben Merriman | 14 | Torfaen D | 9:05.40 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 17 | Joseph Stout | 14 | Co Salford | 8:55.69 |
| 1 | 19 | Kaiden Welsby | 14 | Stockport Mo | 8:55.18 |
| 2 | 21 | Thomas Currie | 15 | Northampton | 8:53.77 |
| 3 | 23 | Ben Wright | 15 | Donc Dartes | 8:52.54 |
| 4 | 25 | Noah Jameson Neal | 15 | Basildon Ph | 8:52.14 |
| 5 | 24 | Henry Maw | 15 | Southport | 8:52.24 |
| 6 | 22 | Thomas Owens | 20 | Bath Univ | 8:52.83 |
| 7 | 20 | Archie Hawkins | 14 | Thanet Swim | 8:54.11 |
| 8 | 18 | Kaden Edwards | 15 | Co Cardiff | 8:55.61 |
| 9 | 16 | Jon Taylor | 15 | Aberdeen Per | 8:56.34 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 27 | Joshua Weston | 15 | Wycombe Dist | 8:50.37 |
| 1 | 29 | James Bartley | 16 | Mt Kelly | 8:48.91 |
| 2 | 31 | Samuel Tucker | 15 | Wycombe Dist | 8:48.69 |
| 3 | 33 | Samuel Murray | 19 | Crawley | 8:48.26 |
| 4 | 35 | Daniel Kennedy | 15 | Co Leicester | 8:47.23 |
| 5 | 34 | Matthew Wright | 21 | Bath Univ | 8:47.79 |
| 6 | 32 | Matthew Woodhall | 15 | Co Sheffield | 8:48.68 |
| 7 | 30 | Mason Bland | 15 | KingstonHull | 8:48.71 |
| 8 | 28 | Hubert Gdaniec | 15 | Plymouth Lea | 8:49.74 |
| 9 | 26 | Samuel Ridgley | 15 | Dulwich Dolp | 8:51.49 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 37 | Marshall Illingworth | 19 | Co Glasgow | 8:45.50 |
| 1 | 39 | Thomas Deffains | 15 | TigersJersey | 8:45.36 |
| 2 | 41 | Ethan Sutcliffe | 16 | Co Leeds | 8:44.87 |
| 3 | 43 | Joey Tippin | 16 | Co Leicester | 8:43.96 |
| 4 | 45 | Aron Preece | 20 | Nova Cent'n | 8:43.45 |
| 5 | 44 | Thomas Trebilcock | 16 | Truro City | 8:43.77 |
| 6 | 42 | Joshua Skinner | 16 | Nova Cent'n | 8:44.16 |
| 7 | 40 | Joshua Fowles | 20 | Witham Dolph | 8:45.34 |
| 8 | 38 | Samuel Blackett | 21 | Northampton | 8:45.43 |
| 9 | 36 | Elijah Kendrick | 15 | Shiverers | 8:46.14 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 47 | Thomas Sansome | 16 | Wycombe Dist | 8:42.64 |
| 1 | 49 | Joseph Sadler | 16 | Nova Cent'n | 8:41.78 |
| 2 | 51 | Liam Snook | 21 | Northampton | 8:41.05 |
| 3 | 53 | Joseph Kingsland | 16 | Nova Cent'n | 8:39.36 |
| 4 | 55 | Bailey Hairsine | 20 | Co Manch Aq | 8:38.15 |
| 5 | 54 | Lewis Binning | 16 | Basildon Ph | 8:38.33 |
| 6 | 52 | Isaac Dodds | 15 | TigersJersey | 8:40.06 |
| 7 | 50 | Oskar Priesemann | 15 | Winchester | 8:41.62 |
| 8 | 48 | Joshua Vance | 16 | Northampton | 8:42.58 |
| 9 | 46 | Joseph Dobb | 19 | Bromley | 8:43.13 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 57 | Max Adams | 15 | Co Salford | 8:36.82 |
| 1 | 59 | Liam McLaughlin | 17 | Warrender Ba | 8:35.26 |
| 2 | 61 | Daniel Marotta | 18 | Swansea Aq | 8:34.96 |
| 3 | 63 | Jackson O'Rourke | 17 | Northampton | 8:34.69 |
| 4 | 65 | Daniel Donovan | 16 | Guildford Ct | 8:34.10 |
| 5 | 64 | Ben Newell | 16 | Didcot & Bar | 8:34.54 |
| 6 | 62 | Charley Langford | 16 | Thanet Swim | 8:34.73 |
| 7 | 60 | Pietro Forconi | 16 | Portsmouth N | 8:35.16 |
| 8 | 58 | Jevon Penny | 16 | Northampton | 8:36.75 |
| 9 | 56 | Jack Muncey | 16 | Perth City | 8:37.57 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 67 | Ellis Stanhope | 17 | RTW Monson | 8:33.73 |
| 1 | 69 | Myles Robinson-Young | 17 | Co Peterboro | 8:33.03 |
| 2 | 71 | Daniel Johnson | 17 | Royal Wolv | 8:31.38 |
| 3 | 73 | Jack Buswell | 18 | Northampton | 8:31.01 |
| 4 | 77 | Nathan Wells | 21 | Loughboro Un | 8:24.78 |
| 5 | 74 | Archie Plowman | 18 | Northampton | 8:30.50 |
| 6 | 72 | Thomas Beamer | 17 | Co Leicester | 8:31.10 |
| 7 | 70 | Adam Hall | 18 | Tewkesbury | 8:31.74 |
| 8 | 68 | Harley Beentjes | 19 | Edinburgh Un | 8:33.14 |
| 9 | 66 | Ioan Evans | 17 | Millfield | 8:34.06 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 76 | Ralph Muncer | 18 | Co St Albans | 8:26.10 |
| 1 | 79 | George Barber | 18 | Royal Wolv | 8:24.33 |
| 2 | 81 | Kieran Bird | 20 | Wycombe Dist | 8:20.15 |
| 3 | 83 | William Ryley | 21 | Bath Univ | 8:09.98 |
| 4 | 85 | Samuel Budd | 21 | Co Sheffield | 7:59.72 |
| 5 | 84 | William Bell | 17 | Co Leicester | 8:01.20 |
| 6 | 82 | Hector Pardoe | 18 | Ellesmere Co | 8:14.53 |
| 7 | 80 | Adam Wilson | 18 | Newcastle | 8:23.40 |
| 8 | 78 | Jakob Goodman | 19 | Millfield | 8:24.48 |
| 9 | 75 | Ciaran Thomas | 17 | Newcastle | 8:26.70 |