Hansen Plumbing needs to address their code and technical issues more thoroughly in the installation of new or replacement equipment as they had to return several times to modify their original work to pass City of Calgary inspection. They should have reviewed the code requirements more thoroughly after their initial jobsite inspection and cost estimation. The basic issue was supply sufficient gas volume to the new equipment with separate parallel lines. Thankfully, the City of Calgary code inspectors ensured that the final work passed inspection. Hansen was co-operative throughout the work and, eventually, the work. However, this work should have been completed to code the first time instead of multiple return trips which required major scheduling issues to us.