Career
He played for the Ottawa Senators, Jokerit, HV71 and Södertälje Saskatchewan over 14 seasons. Törmänen had been playing professionally for Jokerit for four seasons when he was drafted in the 1994 National Hockey League Entry Draft in the eleventh round, 274th overall by the Ottawa Senators of the National Hockey League. After one more season with Jokerit, he signed with the Senators for the 1995-1996 season. Törmänen played in 50 games for the Senators, and 22 games with the Prince Edward Island Senators.
This was his only season in North America.
After the season, he returned to Europe where he returned to Jokerit, and also played for HV71 Jönköping and Södertälje Saskatchewan until retiring after the 2003-2004 season. His best season statistically was 1993-1994 with Jokerit where he scored 20 goals and 18 assists in 46 games.
As a player, he was nicknamed "Törminator". Törmänen coached Espoo Blues U18 and U20 teams, winning U20 title in 2009.
He then moved to Jokerit and was assistant coach of the team, before being sacked mid-season along with head coach Hannu Aravirta.
In 2010-2011 season he is the head coach of Sport in Mestis. On October 21, 2011, he was promoted from assistant to head coach of South Carolina Bern, replacing Larry Huras.