EVENT 404 Open/Male MC 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 2 | 1 | Alfie Penfold | 21 | S13 | GBR - CRWS | |
| 3 | 2 | Mark Tompsett | 18 | S14 | GBR - CMAN | |
| 4 | 3 | Harry Stewart | 20 | S14 | GBR - PLYW | |
| 5 | 4 | Bjorn Aaen | 17 | S10 | Hamilton | 2:18.05 |
| 6 | 5 | Theo Reynolds | 17 | S6 | Barnstaple | 1:53.71 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 6 | McKenzie O'Reilly | 15 | S8 | Gloucester | 1:48.10 |
| 1 | 7 | Ashton Platts | 14 | S14 | Dover Life | 1:21.70 |
| 2 | 8 | William Newton | 16 | S14 | Co Coventry | 1:19.84 |
| 3 | 9 | Liam Hardy | 21 | S14 | Oldham Aqua | 1:18.36 |
| 4 | 10 | Akaash Das | 16 | S8 | Oswestry Ott | 1:15.68 |
| 5 | 11 | Darren Paredes Flores | 19 | S10 | SurreyUni SC | 1:13.23 |
| 6 | 12 | Tom Rust | 35 | S12 | MwayMaritime | 1:13.09 |
| 7 | 13 | Aidan Stanbrook | 17 | S10 | Winchester | 1:10.83 |
| 8 | 14 | Luke Batty | 19 | S9 | GBR - BTMN | 1:09.02 |
| 9 | 15 | Giorgio Oxby | 19 | S14 | Stockport Mo | 1:07.84 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 16 | Reid Maxwell | 17 | S8 | CANADA | 1:07.74 |
| 1 | 17 | Maurice Wetekam | 18 | S9 | GERMANY | 1:06.62 |
| 2 | 18 | Zack Sturgess | 17 | S10 | Bourmth Coll | 1:06.59 |
| 3 | 19 | Dylan Broom | 22 | S14 | GBR - TDOY | 1:06.51 |
| 4 | 20 | Philippe Vachon | 29 | S8 | CANADA | 1:06.39 |
| 5 | 21 | Roan Brennan | 18 | S10 | GBR - BAST | 1:06.33 |
| 6 | 22 | Inigo Llopis Sanz | 26 | S8 | SPAIN | 1:05.75 |
| 7 | 23 | Aymeric Parmentier | 31 | S14 | BELGIUM | 1:05.46 |
| 8 | 24 | Corey Hare | 18 | S14 | teamipswich | 1:05.29 |
| 9 | 25 | Andreas Onea | 32 | S8 | AUSTRIA | 1:04.84 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 26 | Bas Takken | 25 | S10 | NETHERLANDS | 1:04.67 |
| 1 | 27 | Oliver Carter | 24 | S10 | GBR - | 1:03.85 |
| 2 | 28 | Matthew Redfern | 26 | S13 | GBR - WORM | 1:03.54 |
| 3 | 29 | Nathan Maillet | 26 | S14 | FRANCE | 1:03.36 |
| 4 | 30 | Jacobo Garrido Brun | 22 | S9 | SPAIN | 1:03.01 |
| 5 | 31 | Rogier Dorsman | 25 | S11 | NETHERLANDS | 1:03.00 |
| 6 | 32 | Joseph Greaves | 21 | S14 | Nova Cent'n | 1:02.48 |
| 7 | 33 | Owen Garsides | 23 | S14 | KingstonHull | 1:02.26 |
| 8 | 34 | Rio Rogers | 20 | S14 | Basildon Ph | 1:01.22 |
| 9 | 35 | JoseAntonio MariAlcara | 36 | S9 | SPAIN | 1:00.97 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 36 | Jack Milne | 23 | S14 | GBR - NUAX | 1:00.91 |
| 1 | 37 | Adrian LongaronCarrera | 23 | S14 | SPAIN | 1:00.72 |
| 2 | 38 | Malte Braunschweig | 24 | S9 | GERMANY | 1:00.66 |
| 3 | 39 | Louis Lawlor | 22 | S14 | GBR - WCGX | 1:00.15 |
| 4 | 40 | Jude Gunner | 15 | S14 | St Felix Sch | 59.71 |
| 5 | 41 | Rhys Darbey | 17 | S14 | GBR - NCPY | 59.38 |
| 6 | 42 | Cameron Vearncombe | 22 | S14 | GBR - BRIW | 59.24 |
| 7 | 43 | Marc Evers | 33 | S14 | NETHERLANDS | 58.39 |
| 8 | 44 | Alexander Elliot | 28 | S10 | CANADA | 57.95 |
| 9 | 45 | William Ellard | 18 | S14 | GBR - SFST | 56.67 |