Acmerota Smart Immersion Heater Timer Switch,Smart Water Heater Timer Switch 20A 4000W,Works with Google Home Alexa and Smart Life APP Tuya, White, 20A, 4000W (45mm deep box)

This is a sweet little switch, looks huge in the picture, but it's actually a standard size that fits the existing deep box that housed an auxiliary, and unrequired fuse holder I had fitted earlier, there's no real need for it as I have a brand new consumer unit with highly efficient circuit breakers, it comes with a matching deep box to use if one isn't already in place, you need to use a small screwdriverto split the glass front from the unit in order to screw it to the box, there is a plastic protector on the sensor in the center of the unit that I removed, I'm sure it's meant to be removed just before replacing the glass cover, though the pamphlet doesn't tell you to do that, I'm quite sure it's meant to be removed, I did so. I am a retired builder with some knowledge and experience in wireing in new sockets, switches etc, so I know what I'm doing, however if you are not confident in such things, and taking into account that your emersion heater may well be connected to a 30 amp supply, take extreme care, or call in a professional, though once in place clip the outer glass front back in on with a firm push, and with the power supply restored you're ready to go, all the steps necessary to connect to you router are in the pamphlet, good luck, you will wish you'd done it sooner, well worth the money, but be very careful.

This Wifi switch enables me to control the immersion heater via the Alexa system. The set up using the SmartLife App and subsequent linking to Alexa was all straightforward. However the wiring of the control switch did need some care as the connector terminals are not that big (I certainly would not want to switch 40A with it though the 13A for an immersion heater is probably OK). There is no earth post so an extra connector block is required, squashing the whole lot into the rather flimsy back box also isn't that great. The face plate then clips on the front. However as others have noted it would be easy to snap the plastic clips. So overall it does what it claims well and does have a CE / UKCA logo on the packaging, but it doesn't have the build quality I would expect for UK electrical equipment. As for switching 40A - that's for the brave!

Easy to install. But doesn't have an earth connection. Setting up in Tuya was very easy. Set the switch or discover mode and opened the Tuya app and it saw it straight away. Also, as soon as Tuya saw it so did Alexa. I've got my schedule in Alexa so all my smart home stuff is in one place. You need to know it doesn't setup on a 2.4/5ghz wifi. It only sets up in 2.4ghz. So for the initial setup, switch off your 5ghz, do the setup then switch on the 5ghz and it'll work.

Terrible, absolute garbage! My electrician started to fit, but then stopped and told me to return this. He said it is extremely flimsy, definitely not fit for 40A rating. The backbox isn't fit for purpose, isn't bundled with screws, doesn't appear to fit M3.5 or M4 screws which are standard in the UK for socket fronts or conduit boxes. The front wouldn't clip back on after wiring so he ended up giving up on the installation. This will be returned straight away and I shall purchase a better, more suitable product.

I got this for automating my towel rail in the bathroom. I already had a switch and back box. However the electonics needed a deeper box, so glad one came with the switch. Simple to wire, though there is no earth on the switch. Just one in the back box. Smart Home set up was quick and easy. Alexa then recognised it. My only slight grumble is the wifi light does not stay on after discovering the network.

looks good, easy to use & to set up on the app. I used it for switching on my oil-fired hot water, and it's great to be able to do so from anywhere.

The item works well enough so far, time will tell regarding reliability. It is rated at 40A current carrying capacity, it doesn't seem to be heavy duty enough for that kind of load, however I only actually needed 20A so bought a decent safety margin. It integrates well with the Smartlife app for remote operation. I used it on an Economy 7 nightime circuit , which means you can only remotely connect when the circuit is live (at night time), on the plus side it can be set to remember the previous setting when the power goes off, so it will continue as it was, once the circuit is live again. One criticism is that the mounting plate is a little too small for UK size electrical surface boxes, meaning when tightened it pulls inside the box, however it should be fine for boxes sunk in plaster. Maybe the manufacturers will address this, it is the second smart switch I've had with the same issue.

I’m really happy with this switch. Easy to connect to my phone

Excelente dispositivo. Cumple las expectativas de potencia y versatilidad. Lo uso como temporizador para una tostadora de un bar. Se programa desde Smart Life (cosa que tuve que adivinar porque no viene con instrucciones ni código QR). Pero todo bien. Lo recomiendo