Looks like it may only work through IFTTT, which will be a cloud-based solution. I found limited EF solutions and was not wanting to replace exhaust fan, so I ended up doing a retrofit of my existing exhaust fan and relaxing my existing can light with a zigbee one, an aeotec sensors (occupancy/ RH programmed) and a Zooz scene switch. This gives me full st integration and light and sensor worked locally even before Edge was integrated (started this week for this set up). I did not need a new fan or IR lamp though.
I am assuming you are in Australia due to the fan link you provided, so your voltage would be 220 - 240 volts. It looks like the total load is 1070 watts. At that voltage a 1070 watt load is only drawing 4.5 to 4.9 amps with the vast majority of that load being resistive heating elements. Just about any switch out there should handle that load. Typical switches are rated for 10 - 16 amps resistive loads.
No that would not work. You are at 1070 watts combined with 1000 watts at the heater alone.
Multi gang switches might be a problem. I was thinking of single gang switches when I said 10 to 16 amps. ratings
I am in US and not familiar with what would be available in Australia.
If you need separate gangs for the light, fan and heater. You could possibly use a single gang switch for the heater and a 2 gang switch for the light and fan.
That sounds like a good idea. You could use one gang to control a 16 amps relay for the heater circuit and directly control the light and fans with the other 2 gangs.
You can NOT directly wire the relay shown to the switch. You would need to connect them via automations. There may be other relays that can be hard wired.
