EVENT 221 Mens Open 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 3 | 1 | Jonah Silk | 14 | Co Bristol | 17:43.53 |
| 4 | 3 | Alex Rosser-Barnett | 14 | Ellesmere Co | 17:41.48 |
| 5 | 2 | Andrew Hall | 14 | Nova Cent'n | 17:41.61 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 5 | Miles Ward | 14 | Seagulls SC | 17:38.95 |
| 2 | 7 | Owen Webster | 14 | St Felix Sch | 17:36.83 |
| 3 | 9 | Jack Jones | 14 | Royal Wolv | 17:36.04 |
| 4 | 11 | Elijah Kendrick | 13 | Shiverers | 17:33.12 |
| 5 | 10 | Bailey Ward | 15 | Nova Cent'n | 17:34.54 |
| 6 | 8 | Aarian Lally | 14 | Hillingdon | 17:36.71 |
| 7 | 6 | Aidan Mitchell | 14 | Co Birm'ham | 17:38.56 |
| 8 | 4 | Toby Stewart | 14 | Guildford Ct | 17:40.95 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 13 | Oliver Duckworth | 15 | Grimsby AST | 17:31.87 |
| 1 | 15 | James Bartley | 14 | Co Leicester | 17:31.39 |
| 2 | 17 | Joshua Bristow | 15 | Modernian | 17:30.97 |
| 3 | 19 | Thomas Watkin | 15 | Royal Wolv | 17:26.80 |
| 4 | 21 | Casper Raynard | 15 | Derventio | 17:22.44 |
| 5 | 20 | Joshua Williams | 15 | Wycombe Dist | 17:25.20 |
| 6 | 18 | Jay Cushen | 14 | Winsford | 17:29.16 |
| 7 | 16 | Jack Price | 15 | Chesterfield | 17:31.38 |
| 8 | 14 | Thomas Davidson | 15 | Stourbridge | 17:31.65 |
| 9 | 12 | Thomas Wyatt | 15 | Derventio | 17:32.51 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 23 | Harry Spencer | 16 | Killerwhales | 17:21.50 |
| 1 | 25 | Benjamin Shipley | 15 | KingstonHull | 17:20.12 |
| 2 | 27 | Oliver Fairman | 15 | S Bournem'th | 17:19.42 |
| 3 | 29 | Ryan Wilcox | 15 | Nova Cent'n | 17:17.94 |
| 4 | 31 | George Farr | 16 | Co Bristol | 17:17.69 |
| 5 | 30 | Max Underwood | 16 | Co Oxford | 17:17.85 |
| 6 | 28 | Daniel Butler | 15 | Newcastle | 17:18.66 |
| 7 | 26 | Cameron Polak | 15 | TigersJersey | 17:19.61 |
| 8 | 24 | Kris Moodley | 15 | Nova Cent'n | 17:20.24 |
| 9 | 22 | Ryan Huddart | 16 | Rykneld | 17:21.87 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 33 | Christopher Greenhalgh | 21 | West Suffolk | 17:15.05 |
| 1 | 35 | Billy Pettit | 16 | Northampton | 17:13.70 |
| 2 | 37 | Felix Gallagher | 16 | Strat Sharks | 17:10.20 |
| 3 | 39 | Charlie Hopkins | 18 | Crawley | 17:07.26 |
| 4 | 41 | Adam Law | 16 | Bo Kirklees | 17:06.22 |
| 5 | 40 | Thomas Menlove | 16 | Winchester | 17:06.77 |
| 6 | 38 | George Smith | 18 | Guildford Ct | 17:07.69 |
| 7 | 36 | Brandon Sayers | 19 | Teddington | 17:10.98 |
| 8 | 34 | Benjamin Winterburn | 16 | Carnforth | 17:14.46 |
| 9 | 32 | Simon Scully | 18 | Co Leicester | 17:17.39 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 43 | Aidan Wright | 19 | Grantham | 17:04.66 |
| 1 | 45 | Shaun Carter | 17 | Newcastle | 17:01.77 |
| 2 | 47 | Adam Hall | 16 | Gloucester | 17:00.62 |
| 3 | 49 | Ross Large | 17 | Nova Cent'n | 16:56.46 |
| 4 | 51 | Patrick Meggitt | 29 | Co Hereford | 16:53.39 |
| 5 | 50 | Matthew Silvester | 17 | Wigan BEST | 16:54.69 |
| 6 | 48 | Jay Snowden | 17 | Plymouth Lea | 16:57.73 |
| 7 | 46 | Ralph Muncer | 16 | Co St Albans | 17:00.99 |
| 8 | 44 | Luke Bryan | 17 | West Norfolk | 17:03.15 |
| 9 | 42 | Charlie Palmer | 16 | Derventio | 17:05.95 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 53 | Lewis Gilchrist | 17 | Co Oxford | 16:51.38 |
| 1 | 55 | Benjamin Prosser | 17 | Wycombe Dist | 16:47.83 |
| 2 | 57 | William Davies | 17 | Swindon Dolp | 16:43.52 |
| 3 | 59 | Marcus Johnson | 18 | Co Milton K | 16:40.06 |
| 4 | 61 | Thomas Owens | 18 | Barnes SC | 16:37.40 |
| 5 | 60 | Samuel Crabtree | 18 | Thanet Swim | 16:39.35 |
| 6 | 58 | Myles Turner | 17 | West Suffolk | 16:42.74 |
| 7 | 56 | Elliot Pickford | 17 | Wirral Metro | 16:46.68 |
| 8 | 54 | Harry Whiteman | 17 | Co Peterboro | 16:48.33 |
| 9 | 52 | Rhys Taylor | 17 | Nova Cent'n | 16:52.94 |