EVENT 221 Mens Open 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 3 | 1 | Cameron Brooker | 14 | Wycombe Dist | 17:47.18 |
| 4 | 3 | Henry Oliver | 14 | Winsford | 17:45.36 |
| 5 | 2 | Oliver Duckworth | 14 | Grimsby AST | 17:46.92 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 4 | Henry Pearce | 14 | Co Peterboro | 17:44.93 |
| 1 | 6 | Benjamin Holland | 13 | Mt Kelly | 17:42.83 |
| 2 | 8 | Rohan Vazirani | 15 | Ealing | 17:40.70 |
| 3 | 10 | Joseph Deighan | 13 | Stockport Mo | 17:39.52 |
| 4 | 12 | Joseph Kingsland | 13 | Nova Cent'n | 17:39.15 |
| 5 | 11 | Liam Brennan | 14 | Romford Town | 17:39.47 |
| 6 | 9 | Callum Rushan | 14 | Leek | 17:39.98 |
| 7 | 7 | Matthew Fallon | 14 | Nova Cent'n | 17:42.67 |
| 8 | 5 | Lewis Binning | 13 | Romford Town | 17:43.54 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 14 | Harrison Lees | 15 | Watford SC | 17:37.13 |
| 1 | 16 | Ethan Rayment | 15 | Plymouth Lea | 17:34.14 |
| 2 | 18 | Thomas Menlove | 15 | Winchester | 17:30.33 |
| 3 | 20 | Charlie Hopkins | 17 | Crawley | 17:25.67 |
| 4 | 22 | Adam Hall | 15 | Gloucester | 17:23.10 |
| 5 | 21 | Billy Pettit | 15 | Northampton | 17:23.29 |
| 6 | 19 | Joel Lange | 15 | Maidenhead | 17:28.45 |
| 7 | 17 | Ralph Muncer | 15 | Team Luton | 17:31.31 |
| 8 | 15 | Isaac Von Fintel | 15 | Leic Peng | 17:35.73 |
| 9 | 13 | Matthew Burton | 15 | Ealing | 17:38.33 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 24 | George Smale | 17 | Guildford Ct | 17:18.23 |
| 1 | 26 | George Smith | 17 | Guildford Ct | 17:15.25 |
| 2 | 28 | Charlie Hinde | 19 | Epsom Dist | 17:11.28 |
| 3 | 30 | Aidan Wright | 18 | Grantham | 17:07.53 |
| 4 | 32 | Thomas Mackay | 16 | Burnley BOBC | 17:05.68 |
| 5 | 31 | Harry Whiteman | 16 | Co Peterboro | 17:07.07 |
| 6 | 29 | Cavan Beck | 17 | Rochford | 17:10.13 |
| 7 | 27 | William Hawkes | 15 | Grantham | 17:12.12 |
| 8 | 25 | Robbie Jones | 15 | TigersJersey | 17:17.88 |
| 9 | 23 | Joshua Harris | 15 | Nova Cent'n | 17:22.03 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 34 | Elliot Pickford | 16 | Wirral Metro | 17:03.75 |
| 1 | 36 | Paolo Moniz | 16 | Southport | 17:03.34 |
| 2 | 38 | Ross Large | 16 | Nova Cent'n | 17:03.24 |
| 3 | 40 | Oscar Macartney | 17 | Thanet Swim | 17:02.85 |
| 4 | 42 | Bayley Finbow | 16 | teamipswich | 17:01.48 |
| 5 | 41 | Joseph Dobb | 16 | Bromley | 17:02.07 |
| 6 | 39 | Henry Dixon | 16 | Aquae Sulis | 17:03.18 |
| 7 | 37 | Brandon Sayers | 18 | Teddington | 17:03.25 |
| 8 | 35 | Jay Snowden | 16 | Plymouth Lea | 17:03.42 |
| 9 | 33 | Luke Elliott | 17 | South Lincs | 17:04.73 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 44 | William Hendry | 16 | Grimsby AST | 17:00.88 |
| 1 | 46 | Fraser Scott | 18 | Basildon Ph | 16:58.53 |
| 2 | 48 | Alexander Axford | 16 | Co Manch Aq | 16:55.91 |
| 3 | 50 | William Davies | 16 | Swindon Dolp | 16:53.04 |
| 4 | 52 | Max McCusker | 17 | Millfield | 16:50.91 |
| 5 | 51 | Thomas Flower | 17 | RichmondDale | 16:51.23 |
| 6 | 49 | Finn Mc Geever | 16 | Munster IRL | 16:53.66 |
| 7 | 47 | Myles Turner | 16 | West Suffolk | 16:58.43 |
| 8 | 45 | Bradley Capell | 18 | Co Leicester | 16:58.94 |
| 9 | 43 | Henry Willis | 16 | Newcastle | 17:01.14 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 54 | Thomas Roberts | 18 | Halton | 16:47.68 |
| 1 | 56 | Solomon Mhar | 17 | SwimTrafford | 16:47.21 |
| 2 | 58 | Bailey Hairsine | 17 | KingstonHull | 16:45.75 |
| 3 | 60 | Maxwell Dalziel | 19 | Ellesmere Co | 16:45.33 |
| 4 | 62 | George Russell | 19 | Rotherham Mo | 16:40.70 |
| 5 | 61 | Samuel Crabtree | 17 | Thanet Swim | 16:43.25 |
| 6 | 59 | Thomas Smith | 18 | Northampton | 16:45.52 |
| 7 | 57 | Conor Bennett | 18 | SwimTrafford | 16:46.58 |
| 8 | 55 | Matthew Wright | 18 | Team Luton | 16:47.55 |
| 9 | 53 | Patrick Meggitt | 28 | Co Hereford | 16:50.18 |