It is the Monsters' third straight loss by one goal.
The Lake Erie Monsters lost, 1-0, at Abbotsford, Canada, on Wednesday night, their second loss in as many nights to the Heat.
It was their third straight loss by one goal. Lake Erie is now 12-10-2-4 and drops to fourth place in the North.
The Heat scored at the 17:05 mark of the first period when Matt Pelech scored off assists from Lance Bouma and Quintin Laing.
Heat goalie Leland Irving earned his 13th win of the season. Monsters goaltender Jason Bacashihua had 33 saves.