Today i bought an remote control outlet kit from avidsen (2 adapters + remote control) Using the library and info from here and here, was possible to decode the on/off codes.

After finding these codes, i added and actuator to the platform with two functions on() and off()

Electric water heater

Outlet adapter

Outlet adapter and remote control

Actuator in system

Mobile version

New update:

i was forgetting one important thing, set a policy to turn on water heater between 7 am and 8 am and turn off after 8 am.

My policies in system

turn_heater_on policy info