Smart switch for immersion

The Sonoff POWr3 will do it. I have just ordered one for exactly that purpose. Couldn't get a local supplier so is coming through AliExpress.

Don't think there are any other reasonably priced alternatives, it costs about €41.

Direct from Sonoff. https://itead.cc/product/sonoff-pow-r2/ref/3/

I've had one of these on my Immersion for over two years now with no issues.

Works on it's own app or voice control with Alexa / Google Home.

I have yet to find a smart switch to handle Bath/Sink and just disconnected the sink side.

Link

A note of warning here - any of the common immersions here are normally 3kW or 4kW meaning that they take 13A or 17.5A at 230v. For that reason the switch needs to be rated at 20A at a minimum and not 16A as some of the above.👍️

That's aimed at plugged devices... you really need 20A to be safe.

I use one too for last couple of years, hooked up to a hub and can use Alexa to turn it on/off and on a schedule. Bit of tinkering to get it working (goes up/down ok)

The Amazon switch looks to be purpose built to carry the load. It replaces your existing immersion switch and you need to decide which element you're going to use as it's wired in permanently. As was posted already some of the switches suggested are not suitable for a high continuous load. Please be careful in what you choose as the incorrect switch could go on fire.

That looks perfect for the job. Using a phase tester on the existing switch find which wire is live when it's turned on to sink that wire goes into L load, live from the house wiring goes into L. Neutral from the house goes into one N and neutral from the immersion wiring goes into the other N. If you aren't confident fitting it see will a local electrician fit it for you as it has to be done properly as the load is quite high and in some cases the switch can't be seen if the worst should happen. Make sure that the other unused wires are taped back out of the way securely.

No it won’t. Always use a multi meter.

amateurs are more likely to be electrocuted. Electricity doesn’t differentiate

How would the amount of current passing through a cable make any difference if using a phase tester? Unless you actually break into the circuit a multimeter will only show if a voltage is present or not.

Turn off the shower next time 😉

I did notice that the neutral wasn't switched unlike the immersion switch itself. Would it really matter in reality? I wouldn't think so.

In very rare fault scenarios the neutral can float to live voltages which is the risk. Anything that has the potential to fail and electrify your water is an added risk.

Read this from a British source (same as here), a double pole switch MUST be used;

https://www.surejust.co.uk/images/uploaded/documents/Immersion%20Connection%20Instructions.pdf

If anything goes wrong and you didn't use a double pole then you would not be insured and potentially could be open to prosecution. There is very little wiring wise that you are allowed to alter nowdays and if water is involved it is usually a legal requirement to use a qualified spark.

No that isn't the consensus, you can install the smart switch before the immersion switch which keeps the double pole switch in the circuit. I removed my immersion switch and installed an old type 24hr timer which switches both poles it's ancient at this stage but is still working perfectly and nobody was electrocuted in 30 years.

Switchbot will definitely do the trick. I have one and it switches on and off the immersion switch. No messing around with existing wiring required.