Double Pole Switch and Zigbee Switch for Heater

We currently have a water heater directly connected to a double pole Switch.

We require the water heater to be switched by either the double pole switch or from the Zigbee Controller. 

 

The Zigbee Controller 1 Gang has N, L , L1,L2,S1,S2 connections.

 

How can we connected them in-parellel?

What is the part number of Zigbee controller? Or if you have the zingbee board name so we can check the connections on the board.

  Joined February 12, 2018      696
Monday at 02:11 PM