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So leave the current switch on and put the WiFi switch in between the switch and the load.
I’d double check the rating of the WiFi switch tbh. Often they aren’t rated for directly switching big loads like that. If you can’t fit the cable in to the terminal, it suggests that it won’t have the switching capacity.
Are you on economy 7 for your cheap overnight electric? If so it may be on a separate supply. Either way it seems unwise to troubleshoot it online.
I’d get someone in really. There may well also be a much more straightforward solution that a specialist would know.
Nef
Ha thanks for the effort.
So if that switch is left on the immersion will draw any time the water tank gets used. I have cheap power at night so want to heat then and use in the day.
So likely load will be a 3kw heater for 3-4 hours so I want to make sure I do this right or call in a man.