It’s a switch on the outside bathroom wall, leading to another switch inside the cupboard, wired to the tank.
No other controls and not even sure what the second switch is about inside the cupboard.
I do love how Matter has been structured to scan a device QR code and 
boom - it’s ready for use by the Matter-compatible app/bridge. So simple.
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There’ll usually be a point to earth it to. If the switch is plastic it doesn’t need earthing (obviously), if it’s metal it will need earthing. If you are switching a plastic switch out to a metal one, there may not be an earthing wire there so you might need to get some - it’s still pretty simple, just a case of making sure there’s an earthing wire running from the back of the switch to the point in the wall (both usually marked and clear). Plenty of YouTube vids on switching a light switch, it really is a very quick job.
I read something about amps and being a 9kwh tank I think, I’ll leave it to a specialist 
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Fair enough, maybe the switch pusher is a good idea 
I’ve never actually seen one of those before. Looks pretty neat, I wonder how long the battery lasts though
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It’s quite a tough switch too, not a basic light switch.
Also realised need the hub too, which I’m sure I seen the two were about £80.
Lots of variables here - existing switch types/ratings, cable sizes, immersion heater type (top loading or side-loading)? to figure out what current the element can draw.
Once you know this, you can install WiFi enabled switches in circuit (which exceed the max current rating of the immersion heater element) and leave the physical switches ‘On’. The WiFi switch then controls the on/off feed to the Immersion heater. If installed properly in one of the switch housings, you won’t even see them. You can even get power monitoring ones to see how much power each connected device uses and when.
3kwh not 9, not sure where I got that from.
Then outside just a plain switch like a light switch with nothing else on it.
Edit:
Guessing I could use something like this?
20a/4400w type control?
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Going off the immersion heater specs, I get it to be about 13Amps that it can draw (max)
Which is a bit strange as the switch and wiring (as shown in your images) seem to be 13 amp types. Usually, a 13 amp load would have 16 amp (at least) devices feeding it. But anyway… the smart immersion WiFi switching device you’ve found on Amazon can handle up to 20 amps, so it’s more than capable in this installation.
Now the fun part - how do you safely install it? If you’re not absolutely 100% positive that you know what you are doing with regards to quality of installation and ongoing safety, don’t guess… get a qualified electrician to connect it. It won’t be that expensive.
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Oh for sure I won’t do it myself with this type of stuff, my mums partner is an engineer he can do it, I was more curious on the switch type id seen and if it would work for what I want.
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I’m nearly 9 months into a Suri sub and I love it. New heads every 6 months and the handset itself still lasts about 40 days between charges - and USB-C!
Elegant simplicity which just works. Highly recommended.
Not sure if a referral will still work though as it has been a while… (Referral Wiki: Post/Find Here) - probably the same, or less, as the direct Suri website discounts.
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I’m not into expensive brushes, but if I wanted to spend more I’d get this Xiaomi.
https://www.amazon.co.uk/Xiaomi-ELECTRIC-TOOTHBRUSH-T700-EU/dp/B09YV6NKK1
Found this on Amazon
FWIW midrange sonicare is always what I’ve had and it’s always served me well. There may be better deals out there for similar products I guess, but I don’t think you can go wrong with them.
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As I said, I’m not a fan of expensive brushes, they all come with unnecessary bits 
.
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£70 from Boots
Or this white one for £45
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So much of the appeal of Suri for me was the recyclable brush heads and the body that will last for years/is repairable. I hated throwing away so much plastic with my old set up.
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I’ve just been told my build has finished and is ready to be shipped. So it should be here at the end of next month - I’m super excited! 
I can’t believe how far ahead of schedule it is.
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Pre-ordered the S24 Ultra
Not that I needed a new phone but the trade in deal via the EPP shop meant trading in my S23 Ultra it was crazy not to as I got double storage 512gb
And they also threw in a free Galaxy 6 watch, Case and Screen Protectors
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Yes got it via the Samsung EPP shop through work👍
Android for personal phone and got an iPhone as my work one
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