Thatto Heath started strongly with Liam Forsythe crossing at the corner after just four minutes.
Brad Ramejkis then crashed over on 10 minutes before Brook’s Deon Cross reduced the arrears.
Tommy Davies barged his way over for a converted try for Heath after 29 minutes before Brook’s Shaun Hogan pegged them back.
Despite only leading 10-16 at half time, Heath quickly opened up an unassailable lead in the second half.
Scores from Jordan Wakefield, Josh Crehan, Liam Knowles and Oliver Murray put Heath firmly in control.
The only response from Brook in the second half came from Declan Dyas.