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GOAThac
I don’t think these are rated to be used directly with an immersion heater, in fact I don’t think any current switches on the market are.
I’ve been planning out how to automate my central heating and immersion water heater over the past fortnight and the conclusion I’ve come to is that you should use a contactor to control your immersion heater, and use a smart switch/relay to control the contactor.
My plan is to get two Shelly 1pm relays and two matching Shelly 1 gang wall switches and use one relay in place of my apt time clock switch for the central heating, and one to control a contactor for my immersion.
I’ll then get a zigbee trv for every radiator, and manage everything through home assistant.