iHome smart Plug/smartthings with Vornado AVH10 Vortex Room Heater

Planning to set the heater on time schedule using smartthings. Tried both iHome SP5 & GE 12719 Z-Wave Wireless Lighting Control and Appliance Module. Switch can be turned ON or OFF, but once the heater is turned off, though the switch gets ON the heater stays off. Any ideas how resolve?

Heater - https://www.amazon.com/gp/product/B00SVIOFNG