The TWH has been converted to the new T23WH version. Now included in the package is an optional trim frame kit that accommodates the new thinner interior 3″ walls being built to code in Canada:

https://morelectricheating.com/products/WALL%20HEATERS/TWH.aspx

Dimplex TWH Fan Forced Wall Heater

This compact multi-purpose unit is an ideal heating solution for rooms where wall space is limited. The classic design fits any décor, providing instant heat to replace cold air where exterior doors are prevalent. The multi-directional grille can be mounted in any configuration, offering increased floor plan flexibility.